Slanting Surfaces With Friction: A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about force of static friction f on the block?
A. f > mg
B. f > mg cos ?
C. f > mg sin ?
D. f = mg cos ?
E. f = mg sin ?
Answer: E
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Indicate whether the statement is true or false