How does friction affect energy transformations?
Answer: Friction transforms kinetic energy into thermal energy. Ex. Bicycle rubbing against the rim of the wheel.
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A heavy ball hangs by a string, with a second string attached to its bottom. A slow pull on the bottom string breaks the
A) top string. B) bottom string. C) top or bottom string equally.
Sunlight reflected from a smooth ice surface is completely polarized. Determine the angle of incidence. (nice = 1.309)
a. 25.60° b. 47.89° c. 52.62° d. 56.26°
A child bounces a 50-gram superball on the sidewalk. The velocity of the superball changes from 21 m/s downward to 19 m/s upward. If the contact time with the sidewalk is 1/800 s, what is the magnitude of the force exerted on the superball by the sidewalk?
Planet Z-34 has a mass equal to one-third that of Earth and a radius equal to one-third that of Earth
With g representing, as usual, the acceleration due to gravity on the surface of Earth, the acceleration due to gravity on the surface of Z-34 is A) g/3. B) 3 g. C) 6 g. D) g/9. E) 9 g.