A slippery plastic block is resting on a ramp that makes an angle of 20° with the horizontal. The coefficient of static friction between the block and the ramp is 0.2. The coefficient of kinetic friction is 0.15. Will the block start sliding on its own?
If you found that the block slid in part a, calculate its acceleration. If not, then calculate the minimum angle the ramp must have to start the block sliding.

If you answer with something else that isn't the answer, I'll report your answer.

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Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

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