Physics Questions

Rectifiers convert _____.

What will be the value of the kinetic energy (Ek) of a moving body with mass m, if its speed is doubled from v to 2v?

The instrument used to determine the rotation speed of a shaft is called

What is the effective resistance (in Ω) of two resistors 12 Ω and 24 Ω connected in parallel?

Addition of suitable impurities into semiconductor, is called

Terminal velocity ________.

A body of mass 3 kg accelerates from 10 m/s to 20 m/s in 5 seconds due to the application of a force on it. Calculate the magnitude of this force (in N).

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?