a block of ice slides down a frictionless ramp at an angle ∅=50° while an ice worker pulls on the block with a force of 50N and is directed up the ramp. as the block slides through d=0.5 m along the ramp its KE increases by 80j how much greater would the KE have been if rope had not been attached to block
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As the block slides through distance d=0.50 m along the ramp, its kinetic energy increases by 80 j. To find: How much greater would its kinetic energy have been if the rope had not been attached to the block? Hence its K.E. should have increased by the same amount as its P.E. has decreased as mgd sin.
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According to wording of the problem suggests that it is only necessary to examine the contribution from the rope which would be the “Wa " .
W a =−(50N)(0.50m)=−25J
The negative sign arises from the fact that the pull from the rope is anti-parallel to the direction of motion of the block.
Thus, the kinetic energy would have been 25 J greater if the rope had not been attached (given the same displacement).
Explanation:
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