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Answer :

1 J is that the quantity of labor done by a force of one N on associate degree object that displaces it through a distance of one m within the direction of the applied force.

- A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
- When do we say that work is done?
- Write an expression for the work done when a force is acting on an object in the direction of its displacement.
- A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
- What is the kinetic energy of an object?
- Write an expression for the kinetic energy of an object.
- The kinetic energy of an object of mass m, moving with a velocity of 5 m/s is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
- What is power?
- Define 1 watt of power.
- A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
- Define average power

- NCERT solutions for class 9 maths chapter 1 Number Systems
- NCERT solutions for class 9 maths chapter 2 Polynomials
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