Exercise 1

Area under force-displacement graph is equal to

A body is moving unidirectionally under the influence of a source of constant power. Its displacement in time '$t$' is proportional to

A car of mass $m$ has an engine which can deliver power $P.$ The minimum time $t$ in which car can be accelerated from rest to a speed $v$ is

A body of mass $m$ starts from rest with a constant power. If velocity of the body at displacement $s$ is $v,$ then the correct alternative is

The force required to row a boat at constant velocity is proportional to square of its speed. If a speed of $v \mathrm{km} {\mathrm{h}}^{-1}$ requires $4 \mathrm{kW},$ how much power does a speed of $2v \mathrm{km} {\mathrm{h}}^{-1}$ require?

A block of mass $m$ is being pulled up the rough inclined plane by a man delivering constant power $P.$ The coefficient of friction between the block and the inclined is $\mu .$ The maximum speed of block during ascent is

A weight lifter is holding a weight of $80\mathrm{kg}$ on his shoulder for $10 \mathrm{s}$. Work done by the lifter is

A man pulls a bucket out of a well by means of a rope. The work done by the gravity is