+91-8076753736[email protected]
logo
logo
-->

Work, Energy And Power

Question
CBSEENPH11026278
Wired Faculty App

The potential energy of a body is given by U = A - Bx2 (where x is the displacement ) The magnitude of force acting on the particle is

  • constant

  • proportional to x

  • proportional to x2

  • inversely proportional to x

Solution

B.

proportional to x

The potential energy is given by 

U = A - B x2

x - displacement

      F = - dUdv

          = -ddxA - Bx2

        = 2 Bx

⇒    F ∝ x

Some More Questions From Work, Energy and Power Chapter

What is the relation between kWh and Joule?

Does the body at rest possess energy?

By eating two apples, a person starts pushing the wall of room. If food value of apple is 100 calories per apple, how much work he will do in pushing the wall in one hour?

A man is rowing upstream and is at rest w.r.t. shore. Is he doing work w.r.t. shore?

Is frictional force conservative?

What is the work done by gravitational force in taking the mass m with constant velocity through height h?

A mass is tied with a string and whirled in horizontal circle. What is the work done by tension force?

Does the work done by force depend upon the velocity at that instant?

What is the work done by man against gravity when he is carrying a load on his head and walking on the horizontal road?

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation