Question

1. If the angular momentum of a rotating body is increased by 200%, then its kinetic energy of rotation will be increased by (a) 400% (b) 800% (c) 200% (d) 100%

Answer 1

Kinetic energy will get increased by 800%

➠Given:

◉The increase in momentum is 200%

➠Solution:

→The momentum changes kinetic energy also changes.

The kinetic energy is given by the formula given below:

Momentum,p = mv

→P increases by 200%

→P1 = 200/100P + P = 3P

→m1 = m

→v1 = 3v

Increase in K.E = {1/2m(3v)^2 - 1/2mv^2} / 1/2mv^2 x 100%

= 9 - 1 x 100%

= 800%

So correct option is 4

Answer 2

Answer:

=9-1×100

=800

hope it helps