Question

1) a) Define work.

b) Derive a relationship between Joules and ergs.

2) a) Define Kinetic energy.

b) A stone having mass of 500 gm is falling from a height. How much

kinetic energy does it have at the moment when it reaches a velocity is 2 m/s?

3) a) Complete the concept map.

b) State the law of conservation of energy.

4) a) Define power.

b) What is the SI unit of power.

c) K.Wh is used as a unit of power for commercial purposes. Explain.

5) A 1200 W electric iron is used daily for 20 minutes. How much energy is

consumed in the month of February 2020?
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Answer 1

Answer:

correct answer friend

1)Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. ... If the force is being exerted at an angle θ to the displacement, the work done is W = fd cos θ.

2)Joule is the SI unit of energy while erg is the cgs unit of energy. Therefore, 1 Joule is equal to 107 erg.

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