Question

1.Give some examples of positive, negative, and zero work.
2.Write 5 energy transformations you see in your daily life.
3.What are the factors on which kinetic energy depends?
4.Distinguish between work and power.
5.A bulb consumes 3000J of energy when lighted for the 30s. Calculate its power.
6.An electric heater is rated 1500W. How much energy does it use in 10 hrs?
7.A certain household has consumed 250KWh of energy in a month. How much energy is this in joules

Pls Answer the questions step by step...pls

Answer 1

Answer:

1. When a body moves on the horizontal surface, force and displacement act in the forward path. The work is done in this case known as Positive work.

Work was done the gravity on a rocket going perpendicular upwards is an example of negative work.

When we hold an object and walk, the force acts in a downward direction whereas displacement acts in the forward direction is an example of zero work.

2.

• The Sun transforms nuclear energy into heat and light energy.
• Our bodies convert chemical energy in our food into mechanical energy for us to move.
• An electric fan transforms electrical energy into kinetic energy.