NCERT Class 11 Physics Solutions: Chapter 6 – Work, Energy, and Power Part 5
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Question 6.9:
A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time t is proportional to
Answer:
Explanation:
Mass of the body
Acceleration of the body
Using Newton՚s second law of motion, the force experienced by the body is given by the equation:
Both and are constants. Hence, force F will also be a constant.
For velocity v, acceleration is given as,
Where is another constant
Power is given by the relation:
Using Equation and , We have:
Hence, Power is directly proportional to time.
Question 6.10:
A body is moving unidirectionally under the influence of a source of constant power. Its displacement in time is proportional to
Answer:
Power is given by the relation:
Integrating both sides:
For displacement of the body, we have:
Where,
On integrating both sides, we get: