Answer:
The particle-bullet model of light can explain why shadows and semi-shadows form and why light travels in a straight line. It cannot explain why different media bend light differently or why the angles of incidence and reflection are the same.
The potential energy of an apple is 9.0 Joules. The apple is 3.2 m high. What is the mass of the apple?
The mass of the apple witha potential energy of 9.0 Joules is approximately 0.287 kg.
What is the mass of the apple?Potential energy is simply energy possessed by a body due to its position relative to others.
It is expressed as;
P.E = m × g × h
Where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity (approximately 9.8 m/s²), and h is the height of the object.
In this case, the potential energy of the apple is given as 9.0 J and the height of the apple is 3.2 m.
Plugging these values into the formula, we get:
P.E = m × g × h
9.0 J = m × 9.8 m/s² × 3.2 m
9.0 J = m × 31.36 mkg/s²
Dividing both sides by 31.36 m/s², we get:
m = 9.0 J / 31.36 mkg/s²
m = 0.287 kg
Therefore, the mass of the apple is 0.287 kg.
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a narrow capillary of radius 2cm placed in a liquid was observed to rise to a height of 12cm for water and 5cm for mercury. calculate the coefficient of surface tension for water and mercury of density 1000kg/m^3 and 13,000kg/m^3 use g=9.81 m/s^2
The coefficient of surface tension of water is 29400 N/m and the coefficient of surface tension for the mercury in the capillary tube is 159412.5 N/m.
What is surface tension ?The surface tension of a liquid is the force on its surface caused by the particle - particle attraction in the surface layer by the bulk of the liquid which results in the minimization of surface area.
The equation connecting the coefficient of surface tension with radius of capillary, height and density is given as :
γ = ρ g h/2r
For water ,
ρ = 1000 kg/m³
h = 12 cm = 0.12 m
r = 2 cm = 0.02 m.
then γ = 1000 kg/m³ × 9.8 m/s² × 0.12 m/ (2 × 0.02 m)
= 29400 N/m.
For mercury,
ρ = 13000 kg/m³
h = 5 cm = 0.05m
r = 2 cm = 0.02 m.
then γ = 13000 kg/m³ × 9.8 m/s² × 0.05 m/ (2 × 0.02 m)
= 159412.5 N/m.
Therefore, the coefficient of surface tension of water is 29400 N/m and the coefficient of surface tension for the mercury in the capillary tube is 159412.5 N/m.
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Recently, German engineers produced a fuel cell that can generate 4. 2 x 10^10 J of electricity in 1. 1 x 10^3 h. What potential difference would this fuel cell place across a 40. 0 W resistor?
The potential difference that this fuel cell would place across a 40.0 W resistor is 651 V.
To find the potential difference across the resistor, we can use the formula:
Power = (Potential difference)² / Resistance
First, we need to calculate the power generated by the fuel cell:
Energy generated = 4.2 x 10^10 J
Time taken = 1.1 x 10³ h
We need to convert the time taken to seconds:
1.1 x 10³ h x 3600 s/h = 3.96 x 10^6 s
Power generated = Energy generated / Time taken
= (4.2 x 10^10 J) / (3.96 x 10^6 s)
= 1.06 x 10^4 W
Now we can use the formula to find the potential difference:
Power = (Potential difference)²/ Resistance
Rearranging the formula:
Potential difference = √(Power x Resistance)
Resistance = 40.0 W
Potential difference = √(1.06 x 10^4 W x 40.0 W)
= √4.24 x 10^5 V^2
= 651 V (to three significant figures)
Therefore, it can be concluded that the potential difference is calculated to be 651 V for the fuel cell placed across a 40.0 W resistor.
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If the temperature outside is 273 Kelvin, the temperature in degrees Celsius is 0 degrees Celsius. is this ture or false
Answer: false
Explanation: This is false the tempature of -272 celcius in 1 kelvin.
What is the wave speed of a wave that has a frequency of 500Hz and a wavelength of 0.40m?
Car a has a forward speed of 5 m/s and is accelerating at 2. 5 m/s2. Determine the velocity and acceleration of the car relative to observer b, who is riding the ferris wheel and has a constant speed of 3 m/s
Car A has a velocity of 8 m/s and an acceleration of 2.5 m/s2 relative to observer B, who is riding the ferris wheel and has a constant speed of 3 m/s.
Velocity is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time Velocity defines the direction of the movement of the body or the object. Speed is primarily a scalar quantity. Velocity is essentially a vector quantity. It is the rate of change of distance. It is the rate of change of displacement. It can be calculated by obtaining the ratio of displacement and the total time taken. velocity is expressed in metres/second or m/s. The SI unit of velocity is metre per second (m/s).
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Gravitational potential energy is the energy stored in an object due to its height
above a reference level. Which of the following choices best describes the
correct formula of gravitational potential energy?
ΔU = mgh is the expression to Gravitational Potential Energy for Height (h).
What kind of energy from gravitational potential is that?A book on even a high shelf, for instance, has more energy potential than a book here on bottom shelf since it requires a longer distance to fall. Items having gravitational potential energy can also include the following: a heavier burden. water retentive to a dam.
Why does kinetic energy differ from gravitational potential energy?The energy held within an item as a result of its height above the ground is known as gravitational potential energy. The object's height, gravitational acceleration caused by the Earth, and mass all play a role in this. The energy an item possesses as a result of its motion is known as kinetic energy.
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The mass of kerosene needed to boil 5 liters of water at 10°C is (q = 4. 6. 10 J/ kg, % = 4200 J/ kg·grad, heat losses are neglected)
The mass of kerosene needed to boil 5 liters of water at 10°C is approximately 28070 kg.
To determine how much kerosene is needed to boil 5 liters of water at 10°C, we must first determine how much heat is needed to bring the water's temperature up to 100°C and then boil it at that degree.
Heating water from 10°C to 100°C:
4.186 J/g°C (or 4.186 kJ/kg°C) is the specific heat capacity of water. As a result, J is the quantity of heat needed to raise the temperature of 5 liters (or 5000 grams) of water from 10°C to 100°C is:
Q1 = m x c x ΔT
= 5000 g x 4.186 J/g°C x (100°C - 10°C)
= 1952200 J
Water vaporizes at a heat of 2260 kJ/kg (or 2.26 × 106 J/kg) at 100 °C when it is heated to boiling. To boil 5 liters (or 5000 grams) of water at 100°C, the following amount of heat is needed:
Q2 = m x L
= 5000 g x 2.26 x 10^6 J/kg
= 1.13 x 10^10 J
To heat and boil the water, the following amount of heat is needed:
Qtot = Q1 + Q2
= 1952200 J + 1.13 x 10^10 J
= 1.149522 x 10^10 J
Where m is kerosene's mass, c is kerosene's specific heat capacity (4.6 kJ/kg°C), and ΔT is the temperature change of the kerosene.
Assuming that the initial temperature of the kerosene is also 10°C, the temperature change of the kerosene is:
ΔT = 100°C - 10°C
= 90°C
Substituting the values into the equation, we get:
1.149522 x 10^10 J = m x 4.6 kJ/kg°C x 90°C
Solving for m, we get:
m = 28069.6 kg
Hence, 28070 kg of kerosene is required to boil 5 liters of water at 10°C.
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help pls Cuban tree frogs are skilled jumpers. They can launch themselves at 4.5 meters per second at an angle of 26 above horizontal. Assuming the frog is jumping on level ground, what is the frog’s hang time in the air during a single jump?
a.0.92 s
b.1.2 s
c.0.77 s
d.0.40 s
To solve this problem, we need to use the kinematic equations of motion to determine the hang time of the Cuban tree frog during a single jump.
What is Velocity?
It is defined as the displacement of an object per unit time in a particular direction.
In other words, velocity is the speed of an object in a given direction. It is a vector quantity because it has both magnitude (the speed) and direction.
First, we need to find the vertical component of the initial velocity vector (v0) using the sine function:
sin(26°) = vy / 4.5 m/s
vy = 4.5 m/s sin(26°) = 1.98 m/s
The vertical component of the velocity vector determines how high the frog will jump.
Next, we can use the following kinematic equation to solve for the hang time (t) of the frog:
Δy = v0yt - 1/2 gt^2
where Δy is the vertical displacement (i.e., how high the frog jumps), v0y is the vertical component of the initial velocity vector, g is the acceleration due to gravity (9.8 m/s^2), and t is the hang time.
Since the frog jumps on level ground, its vertical displacement is zero (i.e., it returns to its original height). Therefore, we can simplify the equation as follows:
0 = v0yt - 1/2 gt^2
t(1/2 g t - v0y) = 0
t = 0 or t = 2v0y / g
We can discard the solution t = 0 because it is not physically meaningful. Therefore, the hang time of the Cuban tree frog during a single jump is:
t = 2v0y / g = 2(1.98 m/s) / 9.8 m/s^2 = 0.40 s
Therefore, the answer is (d) 0.40 s.
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Determine the tension developed in cable ab for equilibrium of the 440- lb crate. (figure 1) express your answer to two significant figures and include the appropriate units
The tension developed in cable AB for the equilibrium of the 440-lb crate is approximately 1606 lb (to two significant figures). The units are pounds (lb).
To determine the tension developed in cable AB for the equilibrium of the 440-lb crate, we need to use the principle of equilibrium, which states that the net force acting on an object is zero.
Vertical component:
W = 440 lb
Tsin30 = (T/2) lb (since sin30 = 1/2)
Horizontal component:
Tcos30 = (0.866T) lb (since cos30 = √3/2 ≈ 0.866)
Since the crate is in equilibrium, the net force in the vertical direction must be zero. Therefore,
Tsin30 = W
(T/2) = 440 lb
T = 2 × 440 lb / sin30
T ≈ 1606 lb
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please help with this
Answer:
it is
option A . Tuberculosis ✔
Find the angle of refraction for a ray of light passing from air into water when i=23°
The refraction angle is 14.9 degrees. The river reflects part of the light. The remaining light enters the water and travels through it, but it distorts (or refracts) during the process.
What transpires throughout refraction?When a wave enters a medium with a different speed than itself, it bends, which is known as refraction. When light travels through a fast medium and into a slow medium, the light beam is refracted, which causes it to bend in the direction of the line separating the two media.
What is light refraction and why does it happen?The light's rate of travel will alter as it passes throughout one medium and thereafter enters another. Refraction results as a result of this. due to the shift in the medium.
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1 > Explain why scientists cannot watch the complete process of a star and planets forming. J
Scientists cannot watch the complete process of a star and planets forming due to dust
Basically, formation of a star takes place after the accumulation of gas and dust. which gets collapsed due to gravitation. This whole process takes millions of years until a star is formed and starts to shine like a sun. Moreover, the leftovers of from the formed star creates planets. In the whole process of formation of stars and planets the dust makes visible light difficult to see with help of our radio telescopes. Although it is possible for us observe formation of stars by radio waves.
Hence, due to dust and leftovers of stars scientists finds it difficult to see the formation of stars and planets.
Scientists use telescopes and simulations to study the formation of stars and planets because to their long time scales, distant locations, and dense dust and gas in molecular clouds.
Scientists cannot directly watch the full formation of a star and planet since these activities take place over extraordinarily long periods of time and often in faraway and opaque parts of space. In enormous molecular clouds, dense dust and gas block most electromagnetic radiation, including visible light, allowing stars and planets to form.
Time Scales: Scientists can't directly monitor every stage of star and planet formation because it takes millions of years.
Distance: Many of these creation events occur in faraway areas of our galaxy or other galaxies. With current technology, these processes are hard to see.
Obstructions: Thick clouds of dust and gas surround the regions where stars and planets develop, making it difficult for visible light and other electromagnetic waves to penetrate and provide clear observations.
Early Stages: These dense clouds hide the first collapse of material that forms protostars and protoplanetary discs.
Despite these constraints, scientists study these phenomena with infrared, radio, and X-ray telescopes. These approaches let astronomers to see infrared emissions from young stars and protoplanetary discs through dust clouds, indicating their origin. Scientists combine observations with theoretical knowledge to study star and planet formation using computer simulations and models.
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A household uses the following electric appliances:
refrigerator of rating 400W for 10 hours each day.
two electric fans of rating 80 W for 6 hours daily.
Six electric tubes of rating 18 W for 6 hours daily.
Calculate the electricity bill for the household for month of June if cost of electricity energy is ₹ 3.00 per unit
The electric bill for the household for the month of June is ₹ 504.72
How do I deterrmine the electric bill for the month of june?We'll begin by obtaining the energy consumed. This is shown below:
For fridge:
Power = 400 WTime = 10 hoursEnergy for fridge =?Energy = power × time
Energy for fridge = 400 × 10
Energy for fridge = 4000 Wh
Divide by 1000 to express in KWh
Energy for fridge = 4000 / 1000
Energy for fridge = 4 kWh
For fan:
Power = 80 WTime = 6 hoursEnergy for fan =?Energy = power × time
Energy for fan = 80 × 6
Energy for fan = 480 Wh
Divide by 1000 to express in KWh
Energy for fan = 480 / 1000
Energy for fan = 0.48 kWh
Energy for 2 fans = 2 × 0.48 = 0.96 kWh
For tube:
Power = 18 WTime = 6 hoursEnergy for tube =?Energy = power × time
Energy for tube = 18 × 6
Energy for tube = 108 Wh
Divide by 1000 to express in KWh
Energy for tube = 108 / 1000
Energy for tube = 0.108 kWh
Energy for 6 tubes = 6 × 0.108 = 0.648 kWh
Total energy consumed per day = 4 + 0.96 + 0.648 = 5.608 kWh
Total energy consumed per month = 30 × 5.608 = 168.24 kWh
Finally, we shall determine the electric bill for the month of june. Details below:
Cost per KWh = ₹ 3.00Total energy (E) = 168.24 KWhElectric bill for June =?Electric bill = energy × Cost per KWh
Electric bill for June= 168.24 × 3
Electric bill for June = ₹ 504.72
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Answer question in photo
The kinetic energy of this roller coaster car that is moving at the given velocity can be found to be 40, 924. 72 J.
How to find the kinetic energy ?The formula: gives the kinetic energy (KE) of a moving item.
KE = ( 1 / 2 ) mv ²
Where m is the object's mass and v is its speed.
In this instance, the roller coaster car has a mass of 311.11 kg and a velocity of 16.22 m/s. When these values are added to the formula, we obtain:
KE = ( 1 / 2 ) ( 311.11 kg )( 16.22 m/s) ²
KE = (0.5) (311.11 kg) ( 263. 02 m ² /s ²)
KE = 40, 914. 08 joules (J)
In conclusion, the kinetic energy is 40, 914. 08 joules.
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Calculate the velocity of a 9.3 kg object that has 5.4 kgm/8
Answer:
To calculate the escape velocity: Find the object's mass in kilograms, m, and its radius in meters, r. Multiply m by the gravitational constant (6.674 × 10 −11) and then by 2. Divide the result of step 2 by r. Raise the result of step 3 by 0.5. The result is the escape velocity
Explanation:
How does a heater in one corner of a fish aquarium warm the whole aquarium? (1 point)
O The heater warms the glass of the aquarium, which warms the water.
O The heater creates convection currents, which transfer warmer water away from the heater and cooler water toward the heater.
O The heater warms the air above the aquarium, which warms the water.
O The heater adds thermal energy evenly to the aquarium's water.
Answer:
The heater creates convection currents, which transfer warmer water away from the heater and cooler water toward the heater.
Explanation:
When a heater is placed in one corner of a fish aquarium, it heats up the water around it. As the water around the heater gets warmer, it becomes less dense and rises to the top of the aquarium. This movement of warmer water creates a convection current, which transfers the warmer water away from the heater and towards the other areas of the aquarium.
You are given f1(x), a transverse wave that
moves on a string that ends and is FIXED in
place at x = 5 m. As the problem begins, the
wave is moving to the right at v = 1 m/s.
The shape of the wave after 3 seconds will be the same as its initial shape, but it will be displaced to the right by a distance of 3 meters.
Assuming that the wave is a sinusoidal wave, the shape of the wave after 3 seconds can be determined by considering the wavelength and frequency of the wave.
The wavelength is the distance between two consecutive peaks or troughs of the wave, while the frequency is the number of waves that pass a given point in a unit of time. The velocity of the wave is equal to the product of the wavelength and frequency, or v = λf.
If the wave is moving to the right at a constant velocity of 1 m/s, then the wavelength and frequency will remain constant over time. Therefore, the shape of the wave after 3 seconds will be the same as its initial shape, but it will be displaced to the right by a distance of 3 meters.
What is a sinusoidal wave?
A sinusoidal wave is a type of transverse or longitudinal wave that moves in a periodic, or repeating, pattern. The shape of a sinusoidal wave can be represented by a sine or cosine function.In a transverse sinusoidal wave, the particles of the medium move perpendicular to the direction of wave propagation. This type of wave is commonly observed in electromagnetic waves, such as light waves, and in waves on a string.In a longitudinal sinusoidal wave, the particles of the medium move parallel to the direction of wave propagation. This type of wave is commonly observed in sound waves.The properties of a sinusoidal wave include wavelength, frequency, amplitude, and velocity. Wavelength is the distance between two consecutive points in the wave that are in phase, or have the same amplitude and phase angle. Frequency is the number of cycles, or complete wavelengths, that occur in a given time period. Velocity is the speed at which the wave travels through thesame medium.To know more about sinusoidal waves, click the link given below:
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A 4357-kg roller coaster car starts from rest at the top of a 36.5-m high track. Determine the speed of the car at the top of a loop that is 10.8 m high.
Answer:17.24 m/s
Explanation:
When something moves, there is more than one __________________ involved
Answer:
Explanation:
force
what is the difference in seismic wave arrival of the epicenter is 5000 km away
Answer:
2 minutes 20 seconds
Q. Seismic station A is 5000 kilometers from the epicenter. What is the difference between the arrival time of the first P-wave and the arrival time of the first S-wave recorded at this station? answer choices 2 minutes 20 second
Explanation:
Explain in terms of internal energy of the system how the evaporation of sweet cools down the body of the athlete after exercising.
The internal energy of the system how the evaporation of sweet cools down the body of the athlete after exercising are mentioned below.
What is evaporation ?
The water cycle's crucial step is evaporation. When a liquid transforms into a gas, evaporation takes place. As rain puddles "disappear" on a hot day or when wet clothing dries in the sun, it is simple to envision. The liquid water in these instances is evaporating into a gas known as water vapor rather than actually dissipating.
What is energy?
Examples and Definitions of Energy (Science) The capacity to work comes from energy. Energy types include chemical, nuclear, and electrical energy. Science and engineering both depend on the idea of energy. Here is a look at the classification of energy as well as its description and examples.
Therefore, The internal energy of the system how the evaporation of sweet cools down the body of the athlete after exercising are mentioned above.
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Fill in these blanks:
If you increase the temperature of gas in a container that cannot expand, the pressure will _______. This is because the particles in the gas are moving _______ and colliding _______ often.
If you increase the temperature of gas in a container that cannot expand, the pressure will increase. This is because the particles in the gas are moving faster and colliding more often.
What happens when temperature of gas is increased?The kinetic theory of gases explains that the temperature of a gas is related to the average kinetic energy of its particles. When the temperature of the gas is increased, the particles move faster and collide more frequently with the walls of the container, resulting in a greater number of collisions per unit of time.
This increased number of collisions leads to an increase in pressure within the container, as the force of each collision adds up to a greater overall force on the walls of the container. Therefore, increasing the temperature of gas in a container that cannot expand will lead to an increase in pressure.
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!!!ANSWERS ASAP!!!
1: What is the transfer of energy that occurs when a plant makes food through the process of photosynthesis.
A: light to chemical
B: chemical to light
C: light to thermal
D: thermal to nuclear
2: What is the transfer of energy that occurs when you use your ipod to listen to music?
E: sound to electric
F: mechanical to sound
G: thermal to sound
H: chemical to sound
3: What is the transfer of energy that occurs when a boy eats an ice cream?
J: chemical to mechanical
K: chemical to light
L: thermal to chemical
M: thermal to mechanical
4: What is the transfer of energy that occurs with a wind turbine?
R: light to mechanical
S: mechanical to thermal
T: mechanical to nuclear
V: thermal to mechanical
Think of it as abcd, once a is taken, a cant be used again. one is a, one is b, one is c, and one is d. !PLEASE ANSWER FAST!
Answer:
summary the passage you just read be sure to
Answer:
1 - A
2 - F
3 - L
4 - V
Explanation:
Might be a little hard to believe, but the order of the answers are A, B, C, and D, hehe.
You push a 25 kg wooden box across a wooden floor at a constant speed of 1. 0 m/s. How much force do you exert on the box?
You exert a force of 122.625 N on the box, in the opposite direction to the force of friction.
Normal force = mg
Therefore, the force of friction is:
friction = (0.5)(mg) = (0.5)(25 kg)(9.81 m/s^2) = 122.625 N
force exerted by you on the box = -friction = -122.625 N
Force is a fundamental concept in physics that describes the influence of one object on another. It is a vector quantity, meaning it has both magnitude and direction. Force is measured in units of Newtons (N), and is calculated as the product of an object's mass and its acceleration (F=ma).
There are many types of forces, including gravitational, electromagnetic, and nuclear forces. Gravitational force is the force that pulls objects towards each other due to their masses. The electromagnetic force is the force that is responsible for the interaction between electrically charged particles, such as electrons and protons. Nuclear forces are responsible for the interactions between particles in the atomic nucleus.
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Plastics do not deform when bent and can be shaped into objects
Plastics are made of synthetic polymers that are non-deforming when bent or compressed, making them useful for forming into various shapes.
Synthetic polymers are derived from petroleum oil, and made by scientists and engineers. Examples of synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy. Natural polymers occur in nature and can be extracted. They are often water-based.Synthetic polymers are sometimes referred to as “plastics”, of which the well-known ones are nylon and polyethylene. The polymers which are formed by linking monomer units, without any change of material, are known as addition polymers or also called chain-growth polymers.
Synthetic polymers are lightweight, hard to break, and last a long time. They are quite cheap to make and easy to form into shapes. One of the most common and versatile polymers is polyethylene. It is made from ethylene (also known as ethene) monomers.
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3. What property of water makes it possible for some insects to skate across the surface of a river or lake?
A. High specific heat
B. Surface tension
C. Condensation
D. Capillary action
Answer:
B. surface tension
Explanation:
why does the magnetic field allow some of the solar energy but not all?
Between mercury, venus, earth and mars which has the smallest orbit
Answer:
Mercury has the shortest orbit
Explanation:
Its right
A wire whose resistance is R is stretched so that its length is tripled while its volume remains unchanged.
Determine the resistance of the stretched wire.
Express your answer in terms of R and appropriate constant
When a wire is stretched so that its length is tripled, its cross-sectional area decreases by a factor of 3, since the volume of the wire remains the same.
The resistance of a wire is given by the equation:
R = ρ L / A
where R is the resistance, ρ is the resistivity of the wire (a constant that depends on the material), L is the length of the wire, and A is the cross-sectional area of the wire.
If the length of the wire is tripled while its volume remains constant, the cross-sectional area of the wire must decrease by a factor of 3. Therefore, the new cross-sectional area of the wire is 1/3 of its original value.
Let A' be the new cross-sectional area of the wire. Then :--
A' = A / 3
Substituting this expression for A' into the equation for resistance gives:--
R' = ρ (3L) / (A/3) = 9ρL / A
Therefore, the resistance of the stretched wire is 9 times the resistance of the original wire. In terms of the original resistance R, we have:--
R' = 9R
So the resistance of the stretched wire is 9 times the resistance of the original wire.
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