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You have a brick on an inclined plane.

Which of the following methods would effectively yield the coefficient of static friction?

A

Put the brick on the plane at a low angle so that it does not move. Pull the brick up the plane with a force sensor until the block *just* begins to slide upward at a slow constant speed. Divide the pull on the scale by the normal force to calculate the coefficient of static friction.

B

Put the brick on the plane at a low angle so that it does not move. Lift the top of the plane to increase the angle until the block *just* begins to slide at a slow constant speed. Back it off if necessary. The tangent of the angle is the coefficient of static friction.

C

Put the brick on the plane at an angle so that it moves downward. Pull the brick up the plane with a spring scale until the block is at rest. Divide the pull on the scale by the product of the weight and cosine of the angle to calculate the coefficient of static friction.

D

Put the brick on the plane at an angle so that it accelerates downward. Pull the brick up the plane with a force sensor until the block begins to slide downward at a slow constant speed down the plane. Divide the pull on the scale by the product of the weight of the block and the tangent of the angle to calculate the coefficient of static friction.

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