Find velocity of A and B when A is about to touch the ground Also verify that work done by tension on the whole system and N between A and B is zero

In the figure -3.90 shown, the net work done by the tension when the bigger block of mass M touches the ground is :

Assertion : When pendulum bob is rotating in a circle around the point of suspension then work done by tension and the weight is zero . Reason : Work done by a force is defined as dot product of force vector and displacement vector .

When a system is taken from state a to state b, in figure along the path a to c to b , 60J of heat flow into the system, and 30 J of work is done : (i) How much heat flows into the system along the path a to d to b if the work is 10J . (ii) When the system is returned from b to along the curved path, the work done by the system is -20J . Does the system absorb or liberate heat, and how much ? (iii) If , U_(a) = 0 and U_(d)= 22J , find the heat absorbed in the process a to d and d to b .

Let (Delta W_a) and (Delta W_b) be the work done by the system A and B respectively in the previous question.

A gas can be ken from A to B via two different processes ACB and ADB. When path ACB is used 60 J of heat flows into the system and 30 J of work is done by the system. If path ADB is used work done by the system is 10 J. The heat Flow into the system in path ADB is :

Find work done in the process A rarr B (isothermal) by gas?

Assertion : When the force retards the motion of a body, the work done is zero. Reason : Work done depends on angle between force and displacement.