A person standing waist-deep in a swimming pool appears to have short legs because of light
A) reflection.
B) absorption.
C) interference.
D) diffraction.
E) refraction.
Answer: E
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When you lift a heavy 5.0 kg crate straight up from ground level to a height of 2.0 m above ground level, then you have changed the crate's gravitational potential energy by
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