Advertisements
Advertisements
प्रश्न
A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
potential energy acquired by the weights.
Advertisements
उत्तर
Mass of the weights, (m) = 200 kg
Acceleration due to gravity, (g) = 9.8 m/s2
Height above the ground, (h) = 2 m
We can calculate potential energy as,
F.E = m × g × h
So,
`P.E = 200 xx 9.8 xx 2 "J"`
= 3920 J
APPEARS IN
संबंधित प्रश्न
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 force of gravity on mass of 1 kg is g newton, find the potential energy stored in the body.
Define the term potential energy of a body.
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 weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
work done by the weightlifter
To what height should a box of mass 150 kg be lifted, so that its potential energy may become 7350 joules? (g = 9.8 m/s2)
The potential energy of your body is least when you are ______.
Potential energy and heat energy are the two forms of mechanical energy.
A body is falling from a height of h. After it has fallen a height `"h"/2`, it will possess
