Advertisements
Advertisements
Question
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
Solution
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
RELATED QUESTIONS
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s-1. Calculate the maximum potential energy it gains as it goes up.
A pendulum is oscillating on either side of its rest position. The correct statement is:
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
What type of energy is possessed : by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
Give two examples where a body possesses both, kinetic energy as well as potential energy.
Define the term 'energy' of a body. What is the SI unit of energy.
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
Water stored in a dam possesses :
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
A girl with having a mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4 m s–1 by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?
