Login

The potential energy of a freely falling object decreases progressively. What happens to its (i) kinetic energy (ii) total mechanical energy? State the law on which your answer is based.

A household consumes 1 kWh of energy per day. How much energy is this in joule?

1) Kinetic energy will increase as the decrease in potential energy is equal to increase in kinetic energy.

2)Total mechanical energy remains same. As decrease in kinetic energy is equal to the increase in potential energy as per law of conservation of energy energy can neither be created nor be destroyed, it can only change from one form to another. So total mechanical energy will remain same.

3)1kWh=1000 joule/second for 1 hour

=1000 joule/second*60*60

=36,00,000 joules or 3.6*10^6 J

  • 8
View Full Answer

1) Kinetic energy will increase as the decrease in potential energy is equal to increase in kinetic energy.

2)Total mechanical energy remains same. As decrease in kinetic energy is equal to the increase in potential energy as per law of conservation of energy energy can neither be created nor be destroyed, it can only change from one form to another. So total mechanical energy will remain same.

3)1kWh=1000 joule/second for 1 hour

=1000 joule/second*60*60

=36,00,000 joules or 3.6*10^6 J

  • 1

1) Kinetic energy will increase as the decrease in potential energy is equal to increase in kinetic energy.

2)Total mechanical energy remains same. As decrease in kinetic energy is equal to the increase in potential energy as per law of conservation of energy energy can neither be created nor be destroyed, it can only change from one form to another. So total mechanical energy will remain same.

3)1kWh=1000 joule/second for 1 hour

=1000 joule/second*60*60

=36,00,000 joules or 3.6*10^6 J

  • 0
What are you looking for?