Two blocks each of mass m are placed on a smooth horizontal surface.They attract each other with a force `F=(k)/(r)` where r is the separation between them.Calculate work required to increase the separation between the blocks slowly from a to 2a.

Two long wires are placed on a smooth horizontal table. The linear charge densities of these wires are +- lambda C//m . For unit length of the wires, calculate the work requrired to increase the separation between the wires from a to 3a.

Two long wires each oflength I are placed on a smooth horizontal table. Wires have equal but opposite charges. Magnitude oflinear charge density on each wire is lambda . Calculate the work required to increase the separation between the wires from a to 2a:

Two blocks of masses 4kg and 2kg are placed side on a smooth horizontal surface as shown in the figure. A horizontal force of 20N is applied on 4kg block. Find (a) the acceleration of each block. (b) the normal reaction between two blocks.

Two blocks of masses 2 kg and 1 kg are placed on a smooth horizontal table in contact with each other. A horizontal force of 3 newton is applied on the first so that the block moves with a constant acceleration. The force between the blocks would be

A small block of mass M moves with velocity 5 m/s towards an another block of same mass M placed at a distance of 2 m on a rough horizontal surface . Coefficient of friction between the blocks and ground is 0.25 . Collision between the two blocks is elastic , the separation between the blocks , when both of them come to rest , is ( g = 10 m//s^(2) )

Two blocks 'A' and 'B' each of mass 'm' are placed on a smooth horizontal surface . Two horizontal force F and 2F are applied on the blocks A and B , respectively , as shown in figure . The block A does not slide on block B . The normal reaction acting between the two blocks is

Two block of masses m_(1) and m_(2) are placed side by side on a smooth horizontal surface as shown in fig. A horizontal force F is applied on the block . (a) Find the acceleration of each block. (b) Find the normal reaction between the two blocks.

Two blocks of masses m and 2m are placed on a smooth horizontal surface as shown in the figure. Find the acceleration of each block and normal reaction between two blocks if a horizontal force F_(0) is applied on (a) m and (b) 2m

A block of mass m lying on a rough horizontal surface of friction coefficient mu is pulled by a force F as shown , the limiting friction between the block and surface will be