Question
Only friction between the air and the satellite piece prevents the formula from the conservation of energy from being completely accurate. This is stated as _____.
KE = 1/2mv2
PEg = mgh
PEelastic = 1/2kx2
KEi + PEi = KEf + PEf
2.
Choose the best answer.
Which equation describes the energy conversions in the motion of roller coaster car dropping down a hill?
3.
Choose the best answer.
(Double points) A mechanic used a wrench 0.6 meters long to loosen rusted lug nuts on a truck wheel. By standing on the end of the wrench, he was able to apply his entire 100 kg weight to the wrench. How much torque did he apply?
60 N -m
962.5 N-m
588 N-m
980 N-m
4.
Choose the best answer.
A falling satellite piece has a kinetic energy of 47 J, while its potential energy is 198 J. What is the piece's mechanical energy?
198 J
245 J
9.0 J
20.0 J
5.
Choose the best answer.
On September 24, 2011, 26 pieces of a satellite were predicted to fall to the earth's surface. Since the satellite pieces were orbiting the earth from a height of 50 miles, they had _____, or energy due to their position.
mechanical
inertial
potential
kinetic
6.
Choose the the correct units.
A(n) _____ or _____ may be used to express power.
dyne
ampere
joule
horsepower
watt
7.
Choose the best answer.
(Double points) Check all that apply. How much work did a waitress do if she expended 3.2 N when she pushed a cart a total of 4.6 meters?
8.
Choose the best answer.
A little girl at a daycare pushes a toy wooden duck. She applied force to move the mass a distance: therefore she performed _____.
inertia
matter
work
tension
9.
Choose the best answer.
On September 24, 2011, 26 pieces of a satellite were predicted to fall to the earth's surface. Once the satellite pieces began to fall, their potential energies were converted to _____, or energy that objects possess due to motion.
gravitational
potential
kinetic
inertial
10.
Choose the best answer.
On September 24, 2011, 26 pieces of a satellite were predicted to fall to the earth's surface. Once the satellite pieces began to fall, their potential energies were converted to kinetic energy. These pieces hit the earth with the force of their _____ energy or their potential energy combined with their kinetic energy.
inertial
potential
kinetic
mechanical
11.
Choose the best answer.
The mechanical energy of a moving object can be calculated by the following formula _____.
PEelastic = 1/2kx2
ME=KE+PE
PE = mgh
KE = 1/2mv2
12.
Choose the best answer.
On September 24, 2011, 26 pieces of a satellite were predicted to fall to the earth's surface.The satellite pieces were orbiting the earth from a height of 50 miles and their potential energy can be expressed by the formula:
PE=KE+PE
PEelastic = 1/2kx2
PE = mgh
KE = 1/2mv2
13.
Choose the best answer.
Work is measured in _____.
joules
horsepower
positive work
scalar
14.
Choose the best answer.
(Double points) On September 24, 2011, 26 pieces of a satellite were predicted to fall to the earth's surface.The satellite pieces were orbiting the earth from a height of 50 miles. If one piece had a mass of 213 kg and another a mass of 59 kg, which one would have the greater potential energy?
213 kg
59 kg
they both have the same.
neither
15.
Choose the best answer.
(Double points) A waitress expended 3.2 N when she pushed a cart a total of 4.6 meters, if she completed this task in 2 minutes, how much power did she use?
16.
Choose the best answer.
If we measured the rate work is accomplished, we would be measuring _____.
inertia
tension
work
power
17.
Choose the best answer.
The amount of work necessary to move an object can be expressed in _____.
horsepower
joules
watts
amperes
18.
Choose the best answer.
If a satellite piece with a mass of 213 kg lands on the earth's surface, what would its potential energy due to gravity be?
0 J
9.0 J
0.8 J
213 J
KE = 1/2mv2
PEg = mgh
PEelastic = 1/2kx2
KEi + PEi = KEf + PEf
2.
Choose the best answer.
Which equation describes the energy conversions in the motion of roller coaster car dropping down a hill?
3.
Choose the best answer.
(Double points) A mechanic used a wrench 0.6 meters long to loosen rusted lug nuts on a truck wheel. By standing on the end of the wrench, he was able to apply his entire 100 kg weight to the wrench. How much torque did he apply?
60 N -m
962.5 N-m
588 N-m
980 N-m
4.
Choose the best answer.
A falling satellite piece has a kinetic energy of 47 J, while its potential energy is 198 J. What is the piece's mechanical energy?
198 J
245 J
9.0 J
20.0 J
5.
Choose the best answer.
On September 24, 2011, 26 pieces of a satellite were predicted to fall to the earth's surface. Since the satellite pieces were orbiting the earth from a height of 50 miles, they had _____, or energy due to their position.
mechanical
inertial
potential
kinetic
6.
Choose the the correct units.
A(n) _____ or _____ may be used to express power.
dyne
ampere
joule
horsepower
watt
7.
Choose the best answer.
(Double points) Check all that apply. How much work did a waitress do if she expended 3.2 N when she pushed a cart a total of 4.6 meters?
8.
Choose the best answer.
A little girl at a daycare pushes a toy wooden duck. She applied force to move the mass a distance: therefore she performed _____.
inertia
matter
work
tension
9.
Choose the best answer.
On September 24, 2011, 26 pieces of a satellite were predicted to fall to the earth's surface. Once the satellite pieces began to fall, their potential energies were converted to _____, or energy that objects possess due to motion.
gravitational
potential
kinetic
inertial
10.
Choose the best answer.
On September 24, 2011, 26 pieces of a satellite were predicted to fall to the earth's surface. Once the satellite pieces began to fall, their potential energies were converted to kinetic energy. These pieces hit the earth with the force of their _____ energy or their potential energy combined with their kinetic energy.
inertial
potential
kinetic
mechanical
11.
Choose the best answer.
The mechanical energy of a moving object can be calculated by the following formula _____.
PEelastic = 1/2kx2
ME=KE+PE
PE = mgh
KE = 1/2mv2
12.
Choose the best answer.
On September 24, 2011, 26 pieces of a satellite were predicted to fall to the earth's surface.The satellite pieces were orbiting the earth from a height of 50 miles and their potential energy can be expressed by the formula:
PE=KE+PE
PEelastic = 1/2kx2
PE = mgh
KE = 1/2mv2
13.
Choose the best answer.
Work is measured in _____.
joules
horsepower
positive work
scalar
14.
Choose the best answer.
(Double points) On September 24, 2011, 26 pieces of a satellite were predicted to fall to the earth's surface.The satellite pieces were orbiting the earth from a height of 50 miles. If one piece had a mass of 213 kg and another a mass of 59 kg, which one would have the greater potential energy?
213 kg
59 kg
they both have the same.
neither
15.
Choose the best answer.
(Double points) A waitress expended 3.2 N when she pushed a cart a total of 4.6 meters, if she completed this task in 2 minutes, how much power did she use?
16.
Choose the best answer.
If we measured the rate work is accomplished, we would be measuring _____.
inertia
tension
work
power
17.
Choose the best answer.
The amount of work necessary to move an object can be expressed in _____.
horsepower
joules
watts
amperes
18.
Choose the best answer.
If a satellite piece with a mass of 213 kg lands on the earth's surface, what would its potential energy due to gravity be?
0 J
9.0 J
0.8 J
213 J
Answers
GPT-4o mini
Here are the answers to your questions one by one:
1. Only friction between the air and the satellite piece prevents the formula from the conservation of energy from being completely accurate. This is stated as **mechanical energy loss**.
2. The equation that describes the energy conversions in the motion of a roller coaster car dropping down a hill is **KEi + PEi = KEf + PEf**.
3. The mechanic applied torque calculated by the formula τ = r * F, where r = 0.6 m and F = weight in Newtons. The weight can be calculated as F = m * g = 100 kg * 9.8 m/s² = 980 N. Therefore, Torque = 0.6 m * 980 N = **588 N-m**.
4. The mechanical energy of the falling satellite piece is the sum of its kinetic and potential energy: Mechanical Energy = KE + PE = 47 J + 198 J = **245 J**.
5. Since the satellite pieces were orbiting the earth from a height of 50 miles, they had **potential energy**, or energy due to their position.
6. A(n) **watt** or **horsepower** may be used to express power.
7. To find the work done by the waitress, use the formula: Work = Force × Distance. Work = 3.2 N × 4.6 m = 14.72 J.
8. The little girl performed **work**.
9. The potential energies of the satellite pieces were converted to **kinetic** energy, or energy that objects possess due to motion.
10. The pieces hit the earth with the force of their **mechanical** energy or their potential energy combined with their kinetic energy.
11. The mechanical energy of a moving object can be calculated by the following formula: **ME = KE + PE**.
12. The potential energy can be expressed by the formula: **PE = mgh**.
13. Work is measured in **joules**.
14. The piece with a mass of **213 kg** would have greater potential energy since potential energy is directly proportional to mass.
15. Power can be calculated using the formula Power = Work / Time. From question #7, Work = 14.72 J. Time = 2 minutes = 120 seconds. Thus, Power = 14.72 J / 120 s = **0.1223 W** (or approximately **0.12 W**).
16. If we measured the rate work is accomplished, we would be measuring **power**.
17. The amount of work necessary to move an object can be expressed in **joules**.
18. The potential energy due to gravity for the satellite piece with a mass of 213 kg, at the height near Earth's surface (assuming g = 9.8 m/s²), would be PE = mgh. However, if it is already on the Earth's surface, PE would be **0 J**.
Please let me know if you need any further clarification!
1. Only friction between the air and the satellite piece prevents the formula from the conservation of energy from being completely accurate. This is stated as **mechanical energy loss**.
2. The equation that describes the energy conversions in the motion of a roller coaster car dropping down a hill is **KEi + PEi = KEf + PEf**.
3. The mechanic applied torque calculated by the formula τ = r * F, where r = 0.6 m and F = weight in Newtons. The weight can be calculated as F = m * g = 100 kg * 9.8 m/s² = 980 N. Therefore, Torque = 0.6 m * 980 N = **588 N-m**.
4. The mechanical energy of the falling satellite piece is the sum of its kinetic and potential energy: Mechanical Energy = KE + PE = 47 J + 198 J = **245 J**.
5. Since the satellite pieces were orbiting the earth from a height of 50 miles, they had **potential energy**, or energy due to their position.
6. A(n) **watt** or **horsepower** may be used to express power.
7. To find the work done by the waitress, use the formula: Work = Force × Distance. Work = 3.2 N × 4.6 m = 14.72 J.
8. The little girl performed **work**.
9. The potential energies of the satellite pieces were converted to **kinetic** energy, or energy that objects possess due to motion.
10. The pieces hit the earth with the force of their **mechanical** energy or their potential energy combined with their kinetic energy.
11. The mechanical energy of a moving object can be calculated by the following formula: **ME = KE + PE**.
12. The potential energy can be expressed by the formula: **PE = mgh**.
13. Work is measured in **joules**.
14. The piece with a mass of **213 kg** would have greater potential energy since potential energy is directly proportional to mass.
15. Power can be calculated using the formula Power = Work / Time. From question #7, Work = 14.72 J. Time = 2 minutes = 120 seconds. Thus, Power = 14.72 J / 120 s = **0.1223 W** (or approximately **0.12 W**).
16. If we measured the rate work is accomplished, we would be measuring **power**.
17. The amount of work necessary to move an object can be expressed in **joules**.
18. The potential energy due to gravity for the satellite piece with a mass of 213 kg, at the height near Earth's surface (assuming g = 9.8 m/s²), would be PE = mgh. However, if it is already on the Earth's surface, PE would be **0 J**.
Please let me know if you need any further clarification!