Physics Questions

Which of the following can do more work?

Two particles with charges q1 and q2 are kept at a certain distance to exert force F on each other. If the distance is reduced to one-fifth, then the force between them is

An object weighing 20 kg is raised through a height of 2 m. What will be the work done by the force of gravity in this process?

In which of the following mentioned activities is the potential energy (P.E) converted into kinetic energy(K.E)?

Consider a hypothetical planet whose mass and radius are both half that of Earth. If g is the acceleration due to gravity on the surface of Earth, the acceleration due to gravity on the planet will be

If the velocity of a body becomes two times its initial velocity, its kinetic energy becomes n times its initial kinetic energy. What is the value of n?

If a current of 1.5 A is maintained in a resistor of 10 ohm, then the energy dissipated in the resistor in 1 minute will be 

The kinetic energy of a ball weighing 0.5 kg moving with a velocity of 4 m/s will be