Work Energy and...

A body is moved along a straight line by a machine delivering  constant power. The distance moved by the body in time $$ t $$ is proportional to

The relation between the displacement $$ X $$ of an object produced by the application of the variable force $$ F $$ is represented by a graph shown in the figure. If the object undergoes a displacement from $$ X=0.5m $$ to $$ X=2.5m $$ the work done will be approximately equal to 

The displacement x of a particle moving in one dimension under the action of a constant force is related to the time t by the equation $$ t = \sqrt { x} +3 $$ where x is in meters and t is in seconds . the work done by the force in the first $$ 6 $$ second is

The force constant of a wire is k and that of another wire is $$2k $$When both the wires are stretched through same distance, then the work done.

A body of mass $$ 0.1 $$ kg moving with a velocity of $$ 10$$ m/s hits a spring (fixed at the other end) of force constant $$ 1000  $$N/m and comes to rest after compressing the spring. The compression of the spring is

The spring will have maximum potential energy when 

When spring is compressed its potential energy........

Masses of two bodies are $$1$$ kg and $$4$$ kg respectively. If their kinetic energies are in $$2:1$$ proportion, the ratio of their speeds is .........

A pile driver drives postes into the ground by repeatedly dropping a heavy object on them. Assume the object is dropped from the same height each time. By what factor does the energy of the pile driver-Earth system change when the mass of the object being dropped is doubled?

A $$10.0-g$$ bullet is fired into a $$200-g$$ block of wood at rest on a horizontal surface. After impact, the block slides $$8.00\ m$$ before coming to rest. If the coefficient of friction between the block and the bullet before impact?