NCERT Physics Class 11 Exemplar Ch 6 Work Energy and Power Part 2

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Q 9. Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed V as shown in Fig.

Title: Two identical ball bearings in contact

If the collision is elastic, which of the following is a possible result after collision?

(a)

Two identical ball bearings collision elastic — Two Identical Ball Bearings Collision Elastic

(b)

(c)

(d)

Ans: (b)

Q 10. A body of mass 0.5 kg travels in a straight line with velocity where. The work done by the net force during its displacement from m is

(a)

(b)

(c)

(d)

Ans: (b)

Q 11. A body is moving unidirectional under the influence of a source of constant power supplying energy. Which of the diagrams shown in Fig. correctly shows the displacement-time curve for its motion?

(a)

Diagram displacement time curve for its motion. — Diagram Displacement Time Curve for Its Motion

(b)

(c)

(d)

Ans: (b) as displacement

Q 12. Which of the diagrams shown in Fig. most closely shows the variation in kinetic energy of the earth as it moves once around the sun in its elliptical orbit?

(a)

Diagram variation in kinetic energy of the earth — Diagram Variation in Kinetic Energy of the Earth

(b)

(c)

(d)

Ans: (d)