Q1 of 146 Page 162

Name the commercial unit of measurement of energy.

Kilowatt-hour is the commercial unit for the measurement of energy. Its symbol is (kWh).


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When a ball is thrown inside a mocking bus, does its kinetic energy depend on the speed of the bus? Explain.

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A bullet of mass 15 g has a speed of 400 m/s. What is its kinetic energy? If the bullet strikes a thick target and is brought to rest in 2 cm, calculate the average net force acting on the bullet. What happens to the kinetic energy originally in the bullet?

 2

Define kilowatt-hour.

 3

Name two units of power bigger than watt.