Question

state and explain work energy principal mention any three examples for it​.

Answer 1

Answer:

So kinetic energy is increased by the positive work done by the engine. 2) A ball dropped from a height H. Work done by gravity increases the velocity of the ball and thus kinetic energy increases. 3) Brakes are applied in a motor bike and it comes to rest after a few seconds.

Explanation:

Answer 2

Explanation:

Power (p)= v

Energy loss by heat effect can be reduced by

(1) Decreasing the intensity of the current

(2) By decreasing the resistance of the line.

For decreasing the current intensity, the voltage is increased by using a step-up transformer. The electricity thus obtained is passed through thick lines (low resistance). Now, the energy loss due to heating effect is very much reduced. The branches of trees which touch the phase line should be removed or the phase line should be enclosed in a PVC pipe.