Most Important Selected Qs for JEE AdvancedPhysicsWork, Power and Energy
A square carpet of a mass of 20 kg is dragged from one room into another as shown in the figure. The width of the corridor and the carpet is the same, 2 m . The friction coefficient is 0.1 at the end of the first room and 0.2 at the other end, in the corridor it changes linearly from 0.1 to 0.2 . The carpet presses the floor uniformly. If the amount of work that must be done to drag the carpet slowly from the first r
Correct answer
60
Step-by-step solution
= 1 10 ( x 2 +1 ) aligned & W= m g d x= m g 10 [ x^2 4 +x ]₀^2 & W= m g 10 [3-0]= 20 10 3 10 =60 ~J aligned