Advertisements
Advertisements
प्रश्न
Write true or false of the following statement.
One form of energy cannot be converted into another form.
पर्याय
True
False
Advertisements
उत्तर
False.
One form of energy can be converted into the other form.
APPEARS IN
संबंधित प्रश्न
Write true or false of the following statement.
In an electric fan, electrical energy changes into the mechanical energy.
Fill in the blank
The S.I.unit of energy is ______
Select the correct alternatives
The correct statement is
State the unit of energy and define it.
Name the commercial unit of measurement of energy.
How many joules are there in one kilowatt-hour?
What is the common name of '1 kWh' of electrical energy?
Derive the relation between commercial unit of energy (kWh) and SI unit of energy (joule).
- Take two aluminium channels of different lengths.
- Place the lower ends of the channels on the floor and hold their upper ends at the same height.
- Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.
- At the moment of releasing the balls, which energy do the balls have?
- As the balls roll down which energy is converted into which other form of energy?
- Why do the balls cover the same distance on rolling down?
Note: The question is wrong. It should be "Why do the balls cover the same distance after rolling down"? - What is the form of the eventual total energy of the balls?
- Which law related to energy does the above activity demonstrate? Explain.
A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? (g = 10 m s–2)
