The work done by you as you stretch a massless spring is a. the change in the potential energy of the spring b. the negative of the work done by the spring c. parts (a) and (b) d. none of the above
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The work done by you as you stretch a massless spring is
a. the change in the potential energy of the spring
b. the negative of the work done by the spring
c. parts (a) and (b)
d. none of the above
QUESTION
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You stretch a spring from an already stretched position. Which of the following statements is true?
a. The work you do is negative.
b. The work done by the spring is positive.
c. The change in the spring’s potential energy is negative.
d. None of the above are true.
QUESTION
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The work done by a horizontal spring as it is being compressed from its unstretched position is
a. positive
b. negative
c. either positive or negative, depending on where you start
d. depends on how fast you are moving
e. none of the above because work is a scalar that cannot be referred to as positive or negative
QUESTION
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You slide down a snowy hill on a toboggan from a height of 7 m. The hill has a constant slope such that your speed remains constant at 5 m/s throughout the entire journey. Air resistance is negligible. Which of the following statements is true?
a. The magnitude of the work done by gravity is larger than the magnitude of the work done by friction.
b. The work done by friction is equal to the change in the gravitational potential energy.
c. The work done by friction cannot be determined.
d. Friction is not significant because you actually move.
e. None of the above are true.
QUESTION
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You are sitting at your desk. You decide to set your desktop as the point of zero gravitational potential energy, and then you lift a book from a distance h below the desk to a distance h above the desk. Which of the following statements is true about the potential energy of the book-Earth system?
a. The change in potential energy is zero.
b. The final potential energy is 2mgh.
c. The final potential energy is mgh.
d. The change in potential energy is 2mgh.
e. Both (c) and (d) are true.
QUESTION
If a car increases it's speed from 30 km/h to 60 km/h how will the kinetic energy change?
The kinetic energy will be doubled.
The kinetic energy will increase by a factor of 4
The kinetic energy will remain the same
The question cannot be answered without knowing the mass of the car.
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