List of top Physics Questions on work, energy and power

A spring stores $1\,J$ of energy for a compression of $1\,mm$. The additional work to be done to compress it further by $1\,mm$ is

The position vector of the particle is $\vec{r} (t) = a \, \cos \omega t \hat{i} + a \, \sin \, \omega t \, \hat{j}$, where $a$ and $\omega$ are real constants of suitable dimensions. The acceleration is

A rod of mass $m$ and length $l$ (is made to stand at an angle of $ {{60}^{o}} $ with the vertical. Potential energy of the rod in this position is

A particle is released from a height $ S $ . At certain height its kinetic energy is three times its potential energy. The height and speed of the particle at that instant are respectively

Under the action of a constant force, a particle is experiencing a constant acceleration. The power is

Displacement, $x$ (in meters), of a body of mass $1\,kg$ as a function of time, $t$, on a horizontal smooth surface is give as $x = 2t^2$. The work done in the first one second by the external force is

An engine pumps water continuously through a hose. Water leaves the hose with a velocity $v$ and $m$ is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

A ball of mass $m$ is dropped from a height $h$ on a platform fixed at the top of a vertical spring, as shown in figure. The platform is depressed by a distance $x$. Then the spring constant is