A person ties a rock to a string and whirls it around in a vertical circle such that sometimes the rock is going straight upward and sometimes the rock is going straight down
She whirls the rock at the minimum speed (constant in time) such that the string is always taut (no sag). If she were to use a longer string, she would have to whirl the rock at a
A) higher velocity.
B) lower velocity.
C) the same velocity.
A
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The Moon is about one-quarter the diameter of Earth. How does its mass compare?
A. The Moon is 1/81 as massive as Earth. B. The Moon is 1/4 as massive as Earth. C. The Moon is 1/6 as massive as Earth. D. The Moon is 1/32 as massive as Earth.
An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its kinetic energy is a maximum?
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A particle (charge = 50 mC) moves in a region where the only force on it is an electric force. As the particle moves 25 cm from point A to point B, its kinetic energy increases by 1.5 mJ. Determine the electric potential difference, VB - VA
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