A student drags a laboratory trolley along a straight corridor
PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A student drags a laboratory trolley along a straight corridor. The towing rope exerts a force of 120N on the trolley, of which the horizontal component is 104N. The trolley moves at a steady speed of 2.0ms−1.
(i) Calculate the power delivered to the trolley by the towing rope.
(ii) The student now speeds up so that the trolley moves at 3.0ms−1 while the force exerted by the rope remains the same. Calculate the new power.
(iii) Determine the percentage increase in power between the two situations.