Advertisements
Advertisements
प्रश्न
If we increase the velocity of a car moving on a flat surface to four times its original speed, its potential energy ______.
पर्याय
will be twice its original energy
will not change
will be 4 times its original energy
will be 16 times its original energy.
Advertisements
उत्तर
If we increase the velocity of a car moving on a flat surface to four times its original speed, its potential energy will not change.
Explanation:
The energy stored in an object because of its specific state or position is called its potential energy. The potential energy is expressed by the following formula (P.E.) = mgh. That is, the potential energy of an object does not depend on its velocity, but on its height above the ground.
APPEARS IN
संबंधित प्रश्न
Gravitational potential energy U = mass × force of gravity on unit mass × ..........
Write the expression for the gravitational potential energy explaining the meaning of the symbols used.
A body of mass m is moved from ground to a height h. If the force of gravity on mass of 1 kg is g newton, find the force needed to lift the body.
A body of mass m is moved from ground to a height h. If force of gravity on mass of 1 kg is g newton, find the potential energy stored in the body.
Two bodies of same masses are placed at heights h and 2h. Compare their gravitational potential energy.
The potential energy of a body is the energy by virtue of its ______.
A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the adjacent fig. When the trolley is released, it is found to move at a speed v = 2 m s-1. What potential energy did the spring possess when compressed?
A body falls freely under gravity from rest. Name the kind of energy it will possess at the point from where it falls.
A ball of mass m is thrown vertically up with an initial velocity so as to reach a height h. The correct statement is:
Two bodies A and B of equal masses are kept at heights of h and 2h respectively. What will be the ratio of their potential energies?
Is potential energy a vector or a scalar quantity?
State whether the following statement is true or false :
The potential energy of a body of mass 1 kg kept at a height of 1 m is 1 J.
What happens to the potential energy of a body when its height is doubled?
On what factors does the gravitational potential energy of a body depend?
If 784 J of work was done in lifting a 20 kg mass, calculate the height through which it was lifted. (g = 9.8 m/s2)
A man is instructed to carry a package from the base camp at B to summit A of a hill at a height of 1200 metres. The man weighs 800 N and the package weighs 200 N. If g = 10 m/s2,
- how much work does man do against gravity?
- what is the potential energy of the package at A if its is assumed to be zero at B?
How much energy is gained by a box of mass 20 kg when a man, raises the box by 0.5 m in order to place it inside the bus? (g=10 m/s-2)
Potential energy and heat energy are the two forms of mechanical energy.
What energy is possessed by stretched rubber?
