Power - Practice Questions & MCQ

A body of mass m  accelerates uniformly from rest to V  in time T  The instantaneous power delivered to the body as a function of time is given by : 

A body of mass m  accelerates uniformly from rest   to   in time   The instantaneous power delivered to the body as a function of time t is :

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:

Initially block of mass 2 kg was at rest. If variable force $F=(2 t-4) N$ acts on a block. Then find the average power delivered to the block for time interval $t=0 \mathrm{~s}$ to $\mathrm{t}=1 \mathrm{sec}$.

 A weight lifter lifts 300 kg from the ground to a height of 4m in 3 seconds. The average power generated by him is

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 position of a body changes with time as $x=t^2 \hat{i}+t \hat{j}$ due to force F. Then what will be power delivered by their force to the body as a function of time? [mass of body is 1 Kg ]

An object of mass 1000 g experiences a time-dependent force $\overrightarrow{\mathrm{F}}=\left(2 \mathrm{t} \hat{\mathrm{i}}+3 \mathrm{t}^2 \hat{\mathrm{j}}\right) \mathrm{N}$. The power generated by the force at time $t$ is :