Work Power & Energy · Physics · WB JEE

A body of mass 3 kg acted upon by a constant force is displaced by S meter, given by relation $$S = {1 \over 3}{t^2}$$, where t is in second. Work don...

A uniform rope of length 4 m and mass 0.4 kg is held on a frictionless table in such a way that 0.6 m of the rope is hanging over the edge. The work d...

The kinetic energy (Ek) of a particle moving along X-axis varies with its position (X) as shown in the figure. The force acting on the particle at X =...

A block of mass m slides with speed v on a frictionless table towards another stationary block of mass m. A massless spring with spring constant k is ...

Consider an engine that absorbs 130 cal of heat from a hot reservoir and delivers 30 cal heat to a cold reservoir in each cycle. The engine also consu...

A body starts from rest, under the action of an engine working at a constant power and moves along a straight line. The displacement s is given as a f...

A bullet of mass 4.2 $$ \times $$ 10$$-$$2 kg, moving at a speed of 300 ms$$-$$1, gets stuck into a block with a mass 9 times that of the bullet. If t...

A train is moving along the tracks at a constant speed u. A girl on the train throws a ball of mass m straight ahead along the direction of motion of ...

A particle is moving in x-y plane according to $$\overrightarrow r = b\cos \omega t\widehat i + b\sin \omega t\widehat j$$, where $$\omega$$ is const...

The potential energy of a particle of mass 0.02 kg moving along X-axis is given by V = Ax (x $$-$$ 4) J, where x is in metre and A is a constant. Whic...