a) The net momentum of the two athletes is 160.5 kg·m/s to the right
b) their total kinetic energy is 759.56 J.
(a) To find the net momentum, we'll first calculate the momentum of each athlete individually:
Momentum = mass × velocity
Momentum₁ = 110 kg × 2.75 m/s = 302.5 kg·m/s (right)
Momentum₂ = 125 kg × 2.60 m/s = -325 kg·m/s (left, since it's in the opposite direction)
Net momentum = Momentum₁ + Momentum₂ = 302.5 - 325 = -22.5 kg·m/s (left)
Since the net momentum is negative, it's actually to the right, so the magnitude is 160.5 kg·m/s to the right.
(b) To find the total kinetic energy, we'll use the formula:
Kinetic energy = 0.5 × mass × velocity²
KE₁ = 0.5 × 110 kg × (2.75 m/s)² = 414.56 J
KE₂ = 0.5 × 125 kg × (2.60 m/s)² = 845 J
Total kinetic energy = KE₁ + KE₂ = 414.56 + 845 = 759.56 J
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g a student actor is wearing a purple costume on the theatrical stage. what color will the costume appear if a green light illuminates the student?
When a green light illuminates a purple costume on a theatrical stage, the color of the costume will appear as a darker shade of green. This is due to the subtractive color model, which states that colors are created when light is reflected off of an object and absorbed by the object.
In this case, the purple costume is reflecting green light and absorbing all other colors, resulting in a darker shade of green. This effect is even more dramatic when the light is brighter, resulting in a nearly black color.
The color of a costume is also affected by the lighting equipment used, such as the color and power of the light. This means that the costume’s color can be changed based on the lighting used on the stage.
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multiple-object systems without friction: three objects are connected by massless wires over a massless frictionless pulley as shown in the figure. the tension in the wire connecting the 10.0-kg and 15.0-kg objects is measured to be 133 n. what is the mass m?
Three objects are connected by massless wires over a massless frictionless pulley as shown in the figure. the tension in the wire connecting the 10.0-kg and 15.0-kg objects is measured to be 133 n the mass m in the multiple-object system without friction is approximately 13.1 kg.
To find the mass m in this multiple-object system without friction, follow these steps:
1. Analyze the forces acting on each object. For the 10.0-kg and 15.0-kg objects, the forces are tension (T) and gravitational force (weight).
2. Write the equation of motion for each object using Newton's second law (F = ma). For the 10.0-kg object: T - 10.0g = 10.0a, and for the 15.0-kg object: 15.0g - T = 15.0a.
3. Substitute the given tension (133 N) into the equations: 133 - 10.0g = 10.0a and 15.0g - 133 = 15.0a.
4. Solve one of the equations for acceleration (a). For example, from the first equation: a = (133 - 10.0g) / 10.0.
5. Substitute the expression for acceleration into the other equation, and solve for g (the acceleration due to gravity): 15.0g - 133 = 15.0((133 - 10.0g) / 10.0).
6. Solve for g: g ≈ 9.81 m/s^2.
7. Use the value of g to find the acceleration (a) from step 4: a ≈ 0.57 m/s^2.
8. Now, consider the third object with mass m. The forces acting on it are tension (T) and gravitational force (m*g). Write the equation of motion for this object: T - m*g = m*a.
9. Substitute the given tension (133 N) and the calculated acceleration (0.57 m/s^2) into the equation: 133 - m*9.81 = m*0.57
10. Solve for mass m: m ≈ 13.1 kg.
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what is the important of temperature for sericulture explain
Temperature is a crucial factor in sericulture, which is the process of rearing silkworms for the production of silk. The optimal temperature range for silkworm growth and development is between 25°C and 30°C, with a relative humidity of 70-80%.
What happens if the temperature is too low for silkworms in sericulture?If the temperature is too low for silkworms, they grow more slowly, and their development may be delayed, resulting in lower silk production. This is because silkworms are cold-blooded creatures that rely on their environment to regulate their body temperature.
Why is temperature control important in sericulture?Temperature control is crucial in sericulture because it affects the growth, development, and survival of silkworms, which in turn affects the quality and quantity of silk production.
Maintaining the optimal temperature range helps to ensure that silkworms develop and mature quickly, produce high-quality silk, and have a low mortality rate. Temperature control also helps to prevent disease outbreaks and reduces the risk of silkworms becoming stressed and dying.
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consider two future observatories in space: observatory a consists of a single 50-meter telescope. observatory b is an interferometer consisting of five 10-meter telescopes, spread out over a region 100 meters across. which observatory can detect dimmer stars, and which one can see more detail in its images? (assume all else is equal, such as quality of optics, types of instruments, and so on.)
Answer:
Explanation:
Observatory B, the interferometer consisting of five 10-meter telescopes, spread out over a region 100 meters across, would be better able to detect dimmer stars, while Observatory A, the single 50-meter telescope, would be better able to see more detail in its images.
The reason for this is that the ability to detect dimmer stars is largely determined by the amount of light-gathering power of the telescopes, which is proportional to their combined collecting area. In this case, the five telescopes in Observatory B would have a combined collecting area of approximately 785 square meters, while Observatory A would have a collecting area of only 1,963 square meters. As a result, Observatory B would be better able to detect dimmer stars due to its larger combined collecting area.
On the other hand, the ability to see more detail in images is largely determined by the resolving power of the telescopes, which is proportional to their aperture size. In this case, the single 50-meter telescope in Observatory A would have a larger aperture size than each of the individual 10-meter telescopes in Observatory B, which would allow it to see more detail in its images.
Overall, the choice between these two observatories would depend on the specific scientific goals and requirements of the observations being conducted.
Observatory B, the interferometer consisting of five 10-meter telescopes, would likely be able to detect dimmer stars, while Observatory A, the single 50-meter telescope, would likely be able to see more detail in its images.
The reason for this is that interferometers can combine the light from multiple telescopes to create a larger virtual telescope, which can improve the sensitivity and resolution of the observations. The larger the total aperture of the interferometer (i.e., the combined area of all the telescopes), the better its sensitivity to faint objects. Therefore, the five 10-meter telescopes in Observatory B, which have a combined aperture of 250 square meters, would likely be more sensitive to faint stars than the single 50-meter telescope in Observatory A, which has an aperture of only 1,963 square meters.
On the other hand, a larger aperture also improves the resolution of the telescope, allowing it to see more detail in its images. Therefore, the single 50-meter telescope in Observatory A would likely have better resolution and be able to see more fine details in its images than the interferometer in Observatory B.
Overall, the choice of observatory would depend on the specific scientific goals and priorities of the observations. If the goal is to detect fainter objects, then the interferometer in Observatory B would be the better choice. If the goal is to obtain high-resolution images, then the single 50-meter telescope in Observatory A would be the better choice.
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if the semi-circle has diameter 110 centimeters, and the bottom of the window is at a depth of 1.25 meters, find the hydrostatic force on the window.
The hydrostatic force on the window with a semi-circle diameter of 110 centimeters and a depth of 1.25 meters is 42,665.625 N.
To find the hydrostatic force, follow these steps:
1. Convert diameter to radius: Radius (r) = Diameter / 2 = 110 cm / 2 = 55 cm = 0.55 m
2. Calculate the area of the semi-circle: Area (A) = (1/2)πr² = (1/2)π(0.55)² = 0.475625 m²
3. Calculate the pressure at the center of the window: Pressure (P) = ρgh, where ρ (rho) is the density of water (1000 kg/m³), g is the gravitational acceleration (9.81 m/s²), and h is the depth (1.25 m). P = 1000 × 9.81 × 1.25 = 12,262.5 N/m²
4. Multiply the pressure by the area to find the hydrostatic force: Force (F) = PA = 12,262.5 × 0.475625 = 42,665.625 N
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a stomp rocket is launched straight into the air and is being watched by students 400 meters away. after 2 seconds, when the angle of elevation is pi divided by 4, the angle is increasing at a rate of 0.4 radians per second. how fast is the stomp rocket rising at that moment?
The stomp rocket's rate of ascent at pi/4 radians is approximately 110.9 meters per second, given a horizontal distance of 400 meters and a rate of change of 0.4 radians per second.
We know that the tangent of the angle of elevation of the stomp rocket at time t is equal to h(t)/400 (where 400 is the horizontal distance between the students and the rocket). So, when the angle of elevation is pi/4, we can solve for h(t) and find that h(t) = 400 * tan(pi/4) = 400 meters. Next, we can use the chain rule of calculus to find the rate of change of the height of the rocket with respect to time. Since the angle of elevation is increasing at a rate of 0.4 radians per second, we can find that dh/dt = dh/d(theta) * d(theta)/dt = (400 / cos(pi/4)) * 0.4 = approximately 110.9 meters per second.
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on july 4th of one year, the moon is 55% illuminated at 3 pm. on july 5th at 3 pm, the moon is 68% illuminated. on july 6th at 3 pm, it is 83% illuminated. what phase was the moon in on july 5th?
On July 5th, the moon was in its waxing gibbous phase.
The illumination of the moon increases during the waxing phases, from the new moon to the full moon. Based on the given information, we know that:
1. On July 4th, the moon was 55% illuminated.
2. On July 5th, the moon was 68% illuminated.
3. On July 6th, the moon was 83% illuminated.
Since the illumination percentage is increasing each day, the moon is in its waxing phase. When the illumination is between 51% and 99%, it is considered a waxing gibbous phase.
The illumination of the moon increased from 55% to 68% between July 4th and July 5th. This is an increase of 13%. Based on the standard terminology for lunar phases, a waxing phase where the moon is between half-full and full is called a "waxing gibbous" phase. A waxing gibbous phase is characterized by illumination between 51% and 99%. Since the moon was 68% illuminated on July 5th, it was in a waxing gibbous phase at that time.
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if 50 feet of number 12 copper wire has a resistance of 1.2 ohms, what length of number 12 copper would have a resistance of 12 ohms?
A length of 3024.6 feet of number 12 copper wire would have a resistance of 12 ohms.
To determine the length of number 12 copper wire that would have a resistance of 12 ohms, we can use the formula for calculating resistance:
Resistance (R) = Resistivity (ρ) x Length (L) / Cross-sectional Area (A)
First, we need to calculate the resistivity of copper, which is 1.68 x 10^-8 Ωm. We also know that 50 feet of number 12 copper wire have a resistance of 1.2 ohms.
Using these values, we can solve for the cross-sectional area:
1.2 ohms = (1.68 x 10^-8 Ωm) x (50 feet / A)
A = 0.0000000635 m^2
Next, we can use the cross-sectional area to calculate the length of number 12 copper wire that would have a resistance of 12 ohms:
12 ohms = (1.68 x 10^-8 Ωm) x (L / 0.0000000635 m^2)
L = 3024.6 feet
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a student kept her 60 watt, 120 volt study lamp turned on from 2:00 pm until 2:00 am. how many coulombs of charge went through it?
The total charge that went through the 60-watt, 120-volt study lamp between 2:00 pm and 2:00 am is 216,000 coulombs.
To find the charge, follow these steps:
1. Calculate the time the lamp was on: The lamp was on for 12 hours (from 2:00 pm to 2:00 am).
2. Convert the wattage and voltage to amperes (current): Power (W) = Voltage (V) × Current (A). So, Current (A) = Power (W) / Voltage (V) = 60 W / 120 V = 0.5 A.
3. Convert the time to seconds: 12 hours × 60 minutes/hour × 60 seconds/minute = 43,200 seconds.
4. Calculate the charge: Charge (Q) = Current (I) × Time (t) = 0.5 A × 43,200 s = 216,000 coulombs.
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So...Please? Help meh, I suck. Did I mention I said please? :D If you anwer my question ill love you forever PLEASEEE
Recently, cars have been prohibited from driving and parking on the shoreline of a local beach to protect it from pollution and erosion. Driving and parking on the beach is the main reason for the popularity of the beach in the area, so local businesses want the ban lifted. What social, economic, and political issues must be considered to make an informed decision about the new beach driving ban?
Describe the roles of light, carbon dioxide, and water in photosynthesis.
Explain the process of cellular respiration. What organisms undergo cellular respiration?
Describe the similarities and differences between aerobic respiration, and anaerobic respiration.
In a food chain, a rabbit eats grass, and the grass gets its energy from the sun. Describe the cycling of carbon and energy that occurs in this food chain.
Explanation & Answer
There are several social, economic, and political issues that must be considered when deciding whether or not to lift the ban on driving and parking on the shoreline of a local beach.
Social issues:
The impact of the ban on the local community, including those who regularly use the beach and those who live near it
The impact of the pollution and erosion on the beach and its surrounding environment
The impact of increased traffic and congestion on the beach and in the surrounding area
Economic issues:
The impact of the ban on local businesses that will rely on the popularity of the beach for revenue
The cost of implementing and enforcing the ban
The potential for loss of revenue for local businesses if the ban is lifted upwards
Political issues:
The opinions of local residents and businesses on the ban and its impact
The views of local and national politicians on the issue
The balance between economic development and environmental protection
The potential impact of the decision on the political popularity of those involved
I know this isn’t an exact answer but these are only the Political, Economic, and Social issues. So what I see in the question I am guessing you choose one or you use it all. This not be the answers though . . .
[tex]\left[\begin{array}{ccc}A&N&S\\U&&P\\A&B&V\end{array}\right][/tex] Tell me if you have any problems!
before the days of cable, televison often had two atennae on them, one straight, and one circular. which antenna picked up the magnetic oscillations?
Both straight and circular antennas can pick up magnetic oscillations, but they have different polarization properties.
A straight antenna is sensitive to electric field polarizations while a circular antenna is sensitive to magnetic field polarizations.
Therefore, a circular antenna is better suited for picking up circularly polarized electromagnetic waves while a straight antenna is better suited for picking up linearly polarized electromagnetic waves.
In general, the choice of antenna depends on the polarization of the signal being received.
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a rocket is fired from the ground at an angle of 0.98 radians. suppose the rocket has traveled 415 yards since it was launched. draw a diagram and label the values that you know. how many yards has the rocket traveled horizontally from where it was launched?
Horizontal distance traveled by the rocket is x = 0 yards.
The angle of launch θ = 0.98 radians.
The distance traveled by the rocket s = 415 yards.
We need to find horizontal distance traveled by the rocket (x).
Horizontal velocity ([tex]v_{x}[/tex]) = initial velocity ([tex]v_{0}[/tex]) × cos(θ)
Distance traveled horizontally (x) = horizontal velocity ([tex]v_{x}[/tex]) × time (t)
We don't know initial velocity or the time.
Distance traveled (s) = initial velocity ([tex]v_{0}[/tex]) × sin(θ) × time (t) + (1/2) × acceleration (a) × time²
Rocket is fired vertically upward and lands back on the ground. We can assume the final velocity is zero.
time (t) = √(2s/a)
a here is the acceleration due to gravity. If we assume the rocket is fired on Earth, a = 9.8 m/s².
time (t) = √(2 × 415 / 9.8) = 9.37 seconds
Use the horizontal velocity equation,
Horizontal velocity ([tex]v_{x}[/tex]) = initial velocity ([tex]v_{0}[/tex]) × cos(θ)
We don't know [tex]v_{0}[/tex], but we do know the vertical velocity at the highest point of the trajectory is zero.
Vertical velocity ([tex]v_{y}[/tex]) = initial velocity ([tex]v_{0}[/tex]) × sin(θ) - acceleration (a) × time (t)
At the highest point, [tex]v_{y}[/tex] = 0
[tex]v_{0}[/tex] = [tex]v_{y}[/tex] / sin(θ) = 0 / sin(0.98) = 0
Therefore, the initial velocity is zero and the horizontal velocity is also zero. The rocket is launched vertically and lands back on the ground vertically. So horizontal distance traveled by the rocket is x = 0 yards.
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What is the frequency of a wave?
A. the distance from the beginning to the end of a cycle
B. the amount of cycles that occur in a given time
C. the distance traveled by the wave during one full cycle
D. the amount of time that one full cycle takes
I thInk It's B but I don't know
The number of repetitions that take place during a period of time determines a wave's frequency. It is expressed in cycles per second, or Hertz (Hz), a unit of measurement.
What is the equation for a wave's frequency?If the wave's radius and speed are known, the frequency of the wave can be calculated using the equation f=v f = v, where is the wavelength in metres and v is the wave speed in m/s.
What is a wave's frequency?Frequency is the number of waves that pass through a fixed place in a predetermined amount of time. As a result, a pulse that lasts for half a second has a frequency of 2 seconds per pulse. If it takes 1/100 of an hour, the figure is 100 times per hour.
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when considering capacitors in series and in parallel, which values stay the same throughout the circuit? select all that are true.
When capacitors are connected in series or in parallel, the following values remain the same: Voltage across capacitors in parallel, Charge on capacitors in series. Both the options are true.
When capacitors are connected in parallel, they are connected to the same two points in the circuit, which means that they have the same potential difference or voltage across them. This is because the voltage across each capacitor is determined by the voltage of the power source that is connected to the circuit.
On the other hand, when capacitors are connected in series, they have the same charge on them. This is because in a series circuit, there is only one path for the current to flow through, which means that the same amount of charge has to pass through each capacitor.
The charge on a capacitor is directly proportional to the voltage across it, and since the voltage across capacitors in series is divided among them according to their capacitance, the charge on each capacitor is the same.
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The probable question may be:
when considering capacitors in series and in parallel, which values stay the same throughout the circuit? select all that are true. Voltage across capacitors in parallel, Charge on capacitors in series.
a 4.7-kg solid sphere, made of metal whose density is 4000 kg/m3, hangs by a light cord. when the sphere is immersed in water, what is the tension in the cord? the density of water is 1000 kg/m3.
39.21 NTension in the cord The tension in the cord can be calculated as follows; Mass of sphere = 4.7 kg Density of water = 1000 kg/m³Density of the sphere = 4000 kg/m³Now, the density of the sphere will tell us the volume of the sphere.
The density of the solid sphere is 4000 kg/m³. It weighs 4.7 kg. When the sphere is immersed in water, the tension in the cord can be calculated as follows: So, we have the Volume of sphere = Mass/Density= 4.7/4000= 0.001175 m³The volume of water displaced by the sphere is equal to the volume of the sphere. The volume of water = Volume of sphere = 0.001175 m³Now, let's use the density of water to find the mass of the water that was displaced. The density of water is 1000 kg/m³. So, Mass of water displaced = Density of water × Volume of water= 1000 × 0.001175= 1.175 kgNow we can calculate the weight of the sphere. The weight is equal to the mass of the sphere × the acceleration due to gravity (g). We can assume g to be 9.8 m/s².Weight of sphere = Mass of sphere × g= 4.7 × 9.8= 46.06 NTension in the cord = Weight of sphere - Buoyant force= 46.06 - (mass of water displaced × g)= 46.06 - (1.175 × 9.8)= 39.21 N.
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it takes a force of 25 n to stretch a spring 5 m beyond its natural length. how much work is done in stretching the spring 10 m from its natural length?
Answer:
W = 1/2 K x^2 work in stretching spring x meters
W2 / W1 = 10^2 / 5^2 1/2 and K's cancel
W2 = 4 W1
W2 = 100 N
It takes a force of 25 n to stretch a spring 5 m beyond its natural length. " the work done in stretching the spring 10 m from its natural length is 250 Joules."
To calculate the work done in stretching the spring, we will use Hooke's Law and the work-energy principle. Hooke's Law states that the force needed to stretch or compress a spring is proportional to the displacement from its natural length:
F = k * x
where F is the force, k is the spring constant, and x is the displacement from the natural length. We are given that it takes a force of 25 N to stretch the spring 5 m beyond its natural length, so:
25 N = k * 5 m
Now, solve for the spring constant k:
k = 25 N / 5 m = 5 N/m
Next, we need to calculate the work done in stretching the spring 10 m from its natural length. The work-energy principle states that the work done on an object is equal to the change in its potential energy:
W = (1/2) * k * x^2
where W is the work done, k is the spring constant, and x is the displacement from the natural length. We found the spring constant k to be 5 N/m, and we are given that the displacement x is 10 m, so:
W = (1/2) * 5 N/m * (10 m)^2
Now, calculate the work done:
W = (1/2) * 5 N/m * 100 m^2 = 250 J
Therefore, the work done in stretching the spring 10 m from its natural length is 250 Joules.
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If a car travels 60 km/h, how long would it take the car to travel 300 km? Round to the nearest whole number.
Answer:
To solve this problem, we can use the formula:
time = distance/speed
Distance is the distance traveled, and speed is the car's speed.
Substituting the given values, we get:
time = 300 km / 60 km/h = 5 hours
Therefore, it would take the car 5 hours to travel 300 km at 60 km/h. Rounded to the nearest whole number, the answer is 5 hours.
3-
4
Why is the distance traveled between seconds 0 and 1 less than the distance
traveled between seconds 2 and 3?
OA. Air resistance speeds the ball's fall as it approaches Earth.
OB. The ball's velocity decreases by 9.8 m/s for every second it falls.
OC. The ball's velocity increases by 9.8 m/s for every second it falls.
OD. Air resistance slows the ball's fall as it approaches Earth.
Answer:
The correct option is D. Air resistance slows the ball's fall as it approaches Earth.
Explanation:
coil has resistance of 20 ohms and inductance of 0.35 h. compute its reactance and impedance to an alternating current of 25 hz
The reactance of the coil is 21.98 ohms and its impedance to an alternating current is 30.21 ohms
The reactance of a coil with inductance L and frequency f is given by the formula : [tex]X_L = 2\pi fL.[/tex]
Using this formula and the values given, the reactance of the coil is
[tex]X_L = 2\pi (25)(0.35) = 21.98 ohms.[/tex]
The impedance of a coil is given by the formula Z = sqrt(R^2 + X_L^2), where R is the resistance of the coil. Using the values given, the impedance of the coil is Z = sqrt(20^2 + 21.98^2) = 30.21 ohms.
In summary, the reactance of the coil is 21.98 ohms and its impedance to an alternating current of 25 Hz is 30.21 ohms.
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Which example is used as evidence that the Universe begin with the big bang
One of the strongest arguments for the Big Bang theory is the Cosmic Microwave Background Radiation (CMB). It is believed that the CMB, a faint electromagnetic glow that permeates the entire cosmos, is the radiation left over from the actual Big Bang.
Arno Penzias and Robert Wilson made the first finding of radiation in 1964; they were awarded the 1978 Nobel Prize in Physics for it. Strong proof from the CMB supports the theory that the universe originated with a Big Bang by showing that it was once much hotter and denser than it is today.
Big Bang theory.A scientific hypothesis that explains the universe's beginning is the Big Bang theory. The universe originated as a hot, dense, and infinitely tiny point, known as a singularity, around 13.8 billion years ago, claims this hypothesis. The vast and intricate universe we see today was ultimately created as a result of the rapid expansion and cooling of this singularity over time.
Cosmic Microwave Background Radiation is one of the most important pieces of proof for the Big Bang hypothesis. (CMB). It is believed that the CMB, a form of electromagnetic radiation that permeates the entire universe, is the radiation that was left over after the Big Bang. Using a radio observatory, Penzias and Wilson made the initial discovery in 1964.
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a region of very bright colors embedded within a hook echo on a radar screen indicating damage being produced by a tornado is called
The region of very bright colors embedded within a hook echo on a radar screen indicating damage being produced by a tornado is called a debris ball.
A debris ball is a signature on Doppler radar screens that is produced when a tornado is picking up debris and causing damage. The debris is picked up by the tornado and carried aloft, where it is then detected by the radar and appears as a distinct, bright region within the hook echo. The presence of a debris ball on a radar screen is a strong indication that a tornado is on the ground and causing damage. This information is useful for meteorologists and emergency responders, who can use it to issue warnings and alert the public to take appropriate safety measures.
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if the current in the circuit below is 1.0 a counterclockwise (i.e., to the right through the 9 v emf), what is the potential difference of the emf labeled h?
Potential difference of the EMF labeled "h" in the circuit is 5 V.
Current entering junction between 4 Ω resistor and EMF labeled "h" is 1.0 A, and the current leaving junction through 6 Ω resistor is also 1.0 A. Kirchhoff's second law, also known as law of conservation of energy, states that sum of potential differences around any closed loop is equal to zero. We encounter a potential difference of 9 V due to EMF, a potential difference of 4 V due to 4 Ω resistor, and a potential difference of 6 V due to 6 Ω resistor. The total potential difference is therefore:
[tex]9 V - 4 V - 6 V = -1 V[/tex]
According to Kirchhoff's second law . Therefore, potential difference of EMF labeled "h" must be:
[tex]V_h = 9 V - 4 V = 5 V[/tex]
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- two ice skaters stand facing each other at rest on a frozen pond. they push off against one another and the 48.0 kg skater acquires a speed of 0.725 m/s. if the other skater acquires a speed of 0.845 m/s, what is her mass?
The mass of the second ice skater is 39.2 kg.
1. Since the ice skaters push off against each other, their actions result in equal and opposite forces according to Newton's Third Law of Motion.
2. From this law, we know that the total momentum before and after the push will be conserved.
3. Initial total momentum = Final total momentum
4. Before the push, both skaters are at rest, so their initial total momentum is 0.
5. After the push, the 48.0 kg skater has a velocity of 0.725 m/s, and the other skater has a velocity of 0.845 m/s in the opposite direction.
6. Calculate the final total momentum: (48.0 kg)(0.725 m/s) = (mass of second skater)(0.845 m/s)
7. Solve for the mass of the second skater: mass = (48.0 kg)(0.725 m/s) / (0.845 m/s) = 39.2 kg
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a mass revolving around the sun in elliptical orbit changes its shape according to the distance from the sun.identify it
The mass revolving around the sun in an elliptical orbit that changes its shape according to the distance from the sun is a planet.
The shape of a planet's elliptical trajectory in our solar system varies depending on how far away it is from the sun. A planet moves more quickly and has a more elliptical orbit the closest it is to the sun. A planet travels more slowly and has an elliptical orbit the further it is from the sun.
Celestial objects known as planets orbit stars in a nearly spherical form and are sufficiently massive to be free of other space debris. There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. These planets travel in elliptical paths around the Sun.
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how the refraction of light in a mirage is distinct from the refraction of light at an interface like that between air and water
The refraction of light in a mirage is distinct from the refraction of light at an interface like that between air and water as follows: Refraction in a Mirage.
When light passes through the atmosphere, it slows down, bends, and refracts in the air. Refraction happens as the air temperature alters. The warmer the air, the more it refracts. In a mirage, hot air near the surface of the ground refracts light rays above it toward our eyes as if they were reflecting off a flat surface. This implies that a mirage is caused by the bending of light rays when they pass through hot air above a surface.
The light that passes through the air is refracted due to the difference in temperature in the air, resulting in an illusion of a shimmering body of water that appears to be on the ground. Refraction of Light at an Interface. When light moves from one medium to another, it refracts at the interface or the boundary between the two media. This can be seen, for example, when light passes through the air and into the water. When light enters the water from the air, it slows down, bends, and refracts.
The angle of refraction is always greater than the angle of incidence in such situations. This happens because light waves slow down as they enter the denser medium, causing them to bend. The angle at which light rays approach the interface is known as the angle of incidence. When light moves from one medium to another, its speed and wavelength alter, and this is known as refraction.
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if the pump pressure is 86 psi, and the hose lay is 100 feet straight up, what would the nozzle pressure be?
The nozzle pressure is approximately 893892 Pa, or about 129.6 psi.
To determine the nozzle pressure, we can use the Bernoulli's equation, which states that the total pressure of a fluid is constant along a streamline.
Assuming that the fluid is incompressible and the hose is a perfect straight line, the Bernoulli's equation can be simplified as:
P + 0.5rhov^2 + rhogh = constant
where P is the pressure, rho is the density of the fluid, v is the velocity of the fluid, g is the acceleration due to gravity, and h is the height of the fluid above a reference point.
Since the fluid is not moving horizontally, we can assume that the velocity of the fluid is zero at the nozzle, and the velocity head term (0.5rhov^2) can be ignored.
The reference point can be set at the nozzle, where the pressure is the nozzle pressure (P_n). At the pump, the pressure is the pump pressure (P_p), and the height is 100 feet (h = 100 ft).
Therefore, we can write: P_p + rhogh = P_n. where rho is the density of the fluid (water), which is approximately 1000 kg/m^3.
To convert the height from feet to meters, we multiply by 0.3048 m/ft, which gives: h = 100 ft * 0.3048 m/ft = 30.48 m
To convert the pump pressure from psi to Pa, we multiply by 6894.76 Pa/psi, which gives: P_p = 86 psi * 6894.76 Pa/psi = 593089 Pa
Substituting these values into the equation, we get:
P_n = P_p + rhogh
P_n = 593089 Pa + 1000 kg/m^3 * 9.81 m/s^2 * 30.48 m
P_n = 893892 Pa
Therefore, the nozzle pressure is approximately 893892 Pa, or about 129.6 psi.
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calculate the percentage contribution of the elastin toward the total force assuming elastic behavior.
The percentage contribution of the elastin towards the total force assuming elastic behavior will be 100%.
To calculate the percentage contribution of elastin towards the total force assuming elastic behavior, we need to know the total force and the contribution of elastin to the total force.
Let's assume that the total force is F_total and the contribution of elastin to the total force is F_elastin. In an elastic behavior, the force exerted by elastin is directly proportional to the amount of deformation or stretch, given by Hooke's law, which is, F_elastin = k × x
where k is the spring constant of the elastin and x is the amount of deformation or stretch.
If we know the spring constant of the elastin and the amount of deformation or stretch, we can calculate the force exerted by the elastin.
Assuming that there are no other significant sources of force in the system, we can say that the total force is equal to the force exerted by the elastin:
F_total = F_elastin
Therefore, F_total = k × x
To calculate the percentage contribution of elastin towards the total force, we can use the following formula;
Percentage contribution of elastin = (F_elastin / F_total) × 100%
Substituting F_elastin and F_total from the above equations, we get:
Percentage contribution of elastin = (k × x / k × x) × 100%
The k × x term cancels out, leaving us with:
Percentage contribution of elastin = 100%
This means that in an elastic system where the only significant source of force is elastin, the total force is entirely due to the force exerted by the elastin.
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a sinusoidal wave can be described by a cosine function, which is negative just as often as positive. so why isn't the average power delivered by this wave zero?
The average power delivered by a sinusoidal wave that is described by a cosine function is not zero because the negative portions of the wave still contribute to the total power delivered by the wave.
The power delivered by the negative portions of the wave is equal to the power delivered by the positive portions of the wave, and therefore the average power delivered by the wave is not zero. In a sinusoidal wave that is described by a cosine function, the power delivered by the wave is proportional to the square of the amplitude of the wave. The amplitude of the wave is the maximum displacement of the wave from its equilibrium position. The amplitude of the wave is always positive, even during the negative portions of the wave, which means that the power delivered by the negative portions of the wave is also positive. The average power delivered by the wave is calculated by taking the average of the power delivered by the wave over one cycle of the wave. Since the power delivered by the negative portions of the wave is equal to the power delivered by the positive portions of the wave, the average power delivered by the wave is not zero.
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a(n) is a circuit breaker with an intentional delay between the time when the fault or overload is sensed and the time when the cb operates.
Answer:
The answer is time-delay circuit breaker.
An intentional delay between the time when the fault or overload is sensed and the time when the circuit breaker (CB) operates is present in time delay circuit breakers.
What is a circuit breaker?
A circuit breaker is an electrical safety device that is designed to protect an electrical circuit from damage caused by overload, short circuit, or ground fault. A circuit breaker will trip or disconnect the circuit from the power supply when it detects a fault. After resolving the problem, the circuit can be reconnected. The circuit breaker is a critical element of the electrical system. It protects electrical equipment, facilities, and human lives from electrical incidents. It acts as a switch that can be turned off if an electrical fault or damage is detected.
What is a time-delay circuit breaker?
A time-delay circuit breaker is a circuit breaker with an intentional delay between the time when the fault or overload is sensed and the time when the CB operates. It provides time-delay protection against short circuits and overloads. It is used when a motor or other inductive loads are present. In the absence of a time-delay circuit breaker, the breaker may trip immediately due to the high inrush current when an inductive load is switched on. This high current is much greater than the normal full-load current. A time-delay circuit breaker will delay the trip so that the inrush current has time to diminish to normal full-load current levels.
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a heavy rifle initially at rest fires a light bullet. part a which of the following statements about these objects is true? a. the bullet and rifle both gain the same magnitude of momentum. b. the bullet and rifle are both acted upon by the same average force during the firing. c. the bullet and rifle both have the same acceleration during the firing. d. the bullet and the rifle gain the same amount of kinetic energy. which of the following statements about these objects is true? a. the bullet and rifle both gain the same magnitude of momentum. b. the bullet and rifle are both acted upon by the same average force during the firing. c. the bullet and rifle both have the same acceleration during the firing. d. the bullet and the rifle gain the same amount of kinetic energy. a c a, b c, d
The bullet and rifle both gain the same magnitude of momentum. The correct answer is option A.
In this case, the rifle and bullet are initially at rest and after firing, they move in opposite directions with equal magnitudes of momentum. Therefore, the momentum gained by the bullet is equal in magnitude and opposite in direction to that gained by the rifle, and hence the total momentum of the system remains constant.
The average force acting on the bullet and rifle during the firing is not necessarily the same, as it depends on factors such as the mass and acceleration of the bullet and rifle, and the duration of the firing. Similarly, the acceleration of the bullet and rifle can be different, depending on their masses and the forces acting on them during the firing. Finally, the kinetic energy gained by the bullet and rifle is not necessarily the same, as it depends on their masses and velocities after the firing. Hence, the correct answer is option A.
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