PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 5 - Effect of Energy : Work, Power & Energy>EXERCISE>Q 4.1.

HARD

9th West Bengal Board

IMPORTANT

Earn 100

State the factors upon which the work done depends on. State and define the absolute and gravitational unit of work in SI system.

Important Questions on Effect of Energy : Work, Power & Energy

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 5 - Effect of Energy : Work, Power & Energy>EXERCISE>Q 4.2.

How can you show that the sum "

K . E + P . E

" is the same for all positions in the freely falling of a body?

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 5 - Effect of Energy : Work, Power & Energy>EXERCISE>Q 4.3.

What is K.E? Derive an expression of K.E.

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 5 - Effect of Energy : Work, Power & Energy>EXERCISE>Q 4.4.

How work done can be measured? If a force of

50 N

displaces a body through a distance of

5 m

in

10 s

, calculate the power of the agent.

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 5 - Effect of Energy : Work, Power & Energy>EXERCISE>Q 4.4.

How fast should a boy of mass $45 kg$ run to acquire a K.E of $500 J$ ? Calculate the momentum also.