The 4-kg block is now pushed by a force parallel to the incline so that the bloc
ID: 1262039 • Letter: T
Question
The 4-kg block is now pushed by a force parallel to the incline so that the block slides 10m up the 30 degree frictionless incline at a constant speed. (a) find the magnitude of the pushing force. Determine the work done on the block by (b) the pushing force, (c) the force of gravity, (d) the normal force, (e) all of the forces (the net force) on the block (f) find the the change in the kinetic energy on the block The 4-kg block is now pushed by a force parallel to the incline so that the block slides 10m up the 30 degree frictionless incline at a constant speed. (a) find the magnitude of the pushing force. Determine the work done on the block by (b) the pushing force, (c) the force of gravity, (d) the normal force, (e) all of the forces (the net force) on the block (f) find the the change in the kinetic energy on the block The 4-kg block is now pushed by a force parallel to the incline so that the block slides 10m up the 30 degree frictionless incline at a constant speed. (a) find the magnitude of the pushing force. Determine the work done on the block by (b) the pushing force, (c) the force of gravity, (d) the normal force, (e) all of the forces (the net force) on the block (f) find the the change in the kinetic energy on the blockExplanation / Answer
a:
Force F = mg cos theta
F = 4*9.8 * cos 30
F = 34 N
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Work Done W = Fs cos theta
W = 34 * 10
W = 340 N
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Work done by Gravity W = 0 as theta is parallel
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Work doen by normal force = -340 N
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Work Done = change in KE = 340 N
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