A girl applies a force of 50 N, in pushing a table such that work done by her is 25 J. calculate the displacement produced in the table.

What is the work done by a force when the force is: Normal to the displacement produced.

If the work done in pushing a trolley by applying a force of 850 N is 1275 J. calculate the distance moved by the trolley.

If change in internal energy -90 J. The work done by system is + 50 J. Calculate the heat change.

A body of mass 2.0 kg initially at rest is moved by a horizontal force of 0.50 N on a smooth table. Find the work done by the force in 8.0 s and show that this equals the change in the kinetic energy of the body.

A body ,when acted upon by a force of 10 khf , get displaced by 0.5 m.Calculate the work done by the force,when the displacement is (i) in the direction of force ,(ii)at an angle 60^(@) with the force ,and (iii)normal to the force ,(g=10 N kg^(-1) )

What is work done when body will displaces perpendicular to the force ?

A rectangular metallic bar one metre long, one cm deep and one cm broad is placed on a smooth table. The Young's modulus and modulus of rigidity of metal of the bar are 2 xx 10^(11) N//m^(2) and 8 xx 10^(10) N //m^(2) respectively. If now the base of the bar is rigidly clamped to the table, how will you apply a force of 500N, to produce shearing strain in the bar? Calculate the angle of deformation and the horizontal displacement produced in the top layer of the bar.

A force of F=0.5 N is applied on lower block as shown in figure. The work done by lower block on upper block for a displacement of 3 m of the upper block with respect to ground is (Take, g=10 ms^(-2) )

A uniform chain of mass m and length l overhangs a table with its two third part on the table. Fine the work to be done by a person to put the hanging part back on the table.