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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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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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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When something moves, there is more than one __________________ involved
Answer:
Explanation:
force
2. A golfer wishes to chip a shot into the hole 50 m away on flat level ground. If the ball flies to a
maximum height of 25 m, what speed must it have initially to reach the hole?
The speed the golf which is in projectile motion must have initially to reach the hole is 31.321 m/s.
What is projectile?A projectile is any object which is thrown into the space upon which the only acting force is the gravitational force. The primary force which is acting on a projectile is only gravity. This does not necessarily mean that other forces do not act on the object, just that their effect is minimal compared to the gravity.
A golfer wishes to chip a shot into the hole, which is 50 meters away on the flat level ground. If the ball flies to a maximum height of 25 meters.
The angle with which the ball flies,
tan θ = 25 m/ (50m/2)
tan θ = 1
θ = 45°
If u is the initial speed, the maximum height of the ball will be:
H = u² sin²θ / 2g
By putting the values, we get
25 = u² sin²45 / (2 × 9.81)
u = 31.321 m/s
Thus, the initial speed is 31.321 m/s.
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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:
What is the wave speed of a wave that has a frequency of 500Hz and a wavelength of 0.40m?
!!!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.
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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If an object with a charge of 0.08 C experiences an electric force of 5.0 what is the electric field strength ?
Please show you work.
The electric field strength is 62.5 N/C.
What is electric field strength ?Electric field strength (E) is a physical quantity that describes the intensity of the electric field at a particular point in space.
The electric field strength (E) can be calculated using the formula:
E = F/q
Where
F is the electric force and q is the charge.Substituting the given values, we get:
E = 5.0 N/0.08 C
E = 62.5 N/C
Therefore, the electric field strength is 62.5 N/C.
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Between mercury, venus, earth and mars which has the smallest orbit
Answer:
Mercury has the shortest orbit
Explanation:
Its right
23. Describe the objects or materials that
vibrated to produce three of the sounds
10 you've heard today
Answer: 1. flushing the toilet,
2. oil popping in a pan,
3. the clicking of a mouse on a computer,
Explanation: Lu-.v u
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:
A galvanic cell at a temperature of is powered by the following redox reaction: Suppose the cell is prepared with and in one half-cell and and in the other. Calculate the cell voltage under these conditions. Round your answer to significant digits. 2vo2
At the given temperature, the cell voltage can be calculated using the standard reduction potentials of the reactants and products involved in the redox reaction. Using the values provided, the cell voltage would be 2.12 V, rounded to two significant digits.
An electrochemical cell that converts the chemical energy of spontaneous redox reactions into electrical energy is known as a galvanic cell or a voltaic cell. Galvanic cell Voltaic cell is an electrochemical cell that makes use of chemical reactions to generate electrical energy.A galvanic cell or voltaic cell is an electrochemical cell in which an electric current is generated from spontaneous Oxidation-Reduction reactions
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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 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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You have studied and researched different forms of renewable and nonrenewable resources. what recommendations would you make to the committee regarding the types of resources that could be used to generate electricity? This paragraph should be a persuasive writing piece as you consider all you have learned based upon evidence. (8 pts.)
Based on my research and analysis of different renewable and nonrenewable resources, I strongly recommend that the committee prioritize the use of renewable resources for electricity generation. Renewable resources such as solar, wind, hydro, and geothermal power have numerous advantages over nonrenewable resources such as coal, oil, and gas.
First and foremost, renewable resources are more sustainable and environmentally friendly than nonrenewable resources. They do not emit harmful pollutants, greenhouse gases, or other harmful substances that contribute to climate change and environmental degradation. In addition, renewable resources are abundant and can be harnessed from various sources, making them a more reliable and long-term solution for electricity generation.
Furthermore, renewable resources have become more affordable and cost-competitive with nonrenewable resources over time. The cost of solar and wind power has decreased significantly, making them more accessible to households, businesses, and industries. On the other hand, the price of nonrenewable resources is highly volatile and subject to global market fluctuations, making them a less stable and unpredictable source of electricity.
In conclusion, I strongly recommend that the committee prioritize the use of renewable resources such as solar, wind, hydro, and geothermal power for electricity generation. Not only are these resources more sustainable and environmentally friendly, but they are also becoming more affordable and accessible to the general population. By embracing renewable energy, we can create a cleaner, more sustainable, and more prosperous future for ourselves and future generation
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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Isaac uses a lever and applies 42 Newtons to lift a 15-kilogram box. He applies the force over a distance of 6 meters to lift the box a distance of 2 meters. How much work is done?
- 84 Joules
-252 Joules
-630 Joules
-336 Joules
-65 Joules
Answer:
The work done by Isaac can be calculated using the formula:
work = force x distance
where force is the amount of force applied and distance is the distance over which the force is applied. In this case, the force applied by Isaac is 42 Newtons and the distance over which the force is applied is 6 meters. However, we need to calculate the actual distance moved by the box, which is different from the distance over which the force is applied.
To calculate the distance moved by the box, we can use the formula for the mechanical advantage of a lever:
mechanical advantage = distance moved by effort / distance moved by load
In this case, the effort is the force applied by Isaac, the load is the weight of the box (15 kg), and the mechanical advantage is the ratio of the distances moved. We can rearrange this formula to solve for the distance moved by the load:
distance moved by load = distance moved by effort / mechanical advantage
In this case, the distance moved by effort is 2 meters (the height the box is lifted), and the mechanical advantage can be calculated using the ratio of the lengths of the lever arms (assuming the lever is a simple machine). Let's say the lever has two arms, one on each side of the pivot point, with lengths of L1 and L2. The mechanical advantage of the lever is:
mechanical advantage = L2 / L1
Assuming Isaac applied the force at the end of one arm, and lifted the load at the end of the other arm, we can say that the ratio of the lengths of the arms is:
L2 / L1 = 2 / 6
Simplifying, we get:
L2 = L1 / 3
This means that the load is lifted a distance of 2/3 meters (or 0.67 meters), which is the distance moved by the load. Now we can calculate the work done by Isaac:
work = force x distance
= 42 N x 6 m
= 252 J
Therefore, the amount of work done by Isaac to lift the 15-kilogram box is 252 Joules. The correct answer is (B) 252 Joules.
please help with this
Answer:
it is
option A . Tuberculosis ✔
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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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:
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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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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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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A roller coaster starts at a high peak with 60 J of gravitational potential energy. When it reaches a second peak, it has only 50 J of potential energy. Calculate the difference in energy and explain what happened to it.
Answer:
10 J
Explanation:
The difference in energy between the two peaks is 10 J.
As the roller coaster moves from the first peak to the second peak, it loses 10 J of gravitational potential energy. This energy is converted into other forms of energy, such as kinetic energy (the energy of motion) and thermal energy (the energy of heat).
Some of the gravitational potential energy is converted into kinetic energy as the roller coaster accelerates down the first peak. As it reaches the second peak, some of the kinetic energy is converted back into gravitational potential energy, but not all of it. The difference between the initial and final potential energy represents the energy that was lost or converted into other forms.
A Copper rod whese lenght at 30°C is 10cm is heated find its new length. Take linear expansivity of copper as 0000017k
If a copper rod whose coefficient of linear expansion is 0.000017 is heated at 30⁰C and its length is 10cm, Then the new length of the copper rod is 10.0051cm.
What is linear expansion?If a body is subjected to expansion by virtue of temperature then its length gets increased by some extent that new length is given by,
Ln=L₀(1+[tex]\alpha[/tex]Δt)
where Ln = New length after expansion.
L₀= Original length of the body.
[tex]\alpha[/tex]= Coefficient of linear expansion.
Δt= Change in temperature.
Here in the question, given
L₀=10cm
t= 30°C
[tex]\alpha[/tex]= 0.000017
new length
Ln= 10(1+0.000017×30)
Ln=10.0051cm
Hence the new length of the copper rod after the expansion is 10.0051cm.
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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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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:
What light phenomena can be explained using the particle-bullet model of light? check all that apply. What light phenomena can be explained using the particle-bullet model of light?check all that apply. Why shadows and semi-shadows form. Why different media bend light differently. Why the angles of incidence and reflection are the same. Why light travels in a straight line
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.
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.