Advertisements
Advertisements
प्रश्न
In what way does the temperature of water at the bottom of a waterfall differ from the temperature at the top? Explain the reason.
Advertisements
उत्तर
When water falls from a height, the potential energy stored in water at a height changes into the kinetic energy of water during the fall. On striking the ground, a part of the kinetic energy of water changes into the heat energy due to which the temperature of water rises.
APPEARS IN
संबंधित प्रश्न
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s−2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
State whether the object possess kinetic energy, potential energy, or both :
A bird running on the ground ____________.
What kind of energy is possessed by the following?
Water stored in the reservoir of a dam __________.
What kind of energy is possessed by the following?
A stretched rubber band _____________
A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone?
Name the device or machine which convert :
Chemical energy into electrical energy.
Fill in the blanks with suitable words :
The principle of ___________ of energy says energy can be transformed from one form to another, but it cannot be ___________ or ___________.
How much electrical energy in joules does a 100 watt lamp consume : in 1 minute?
Describe the energy changes which take place in a radio.
Write the energy transformations which take place in an electric bulb (or electric lamp).
