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
A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.
A bucket full of water is on the first floor of your house and another identical bucket with the same quantity of water is kept on the second floor. Which of the two has greater potential energy?
Find the gravitational potential energy of 2.5 kg mass kept at a height of 15 m above the ground. The force of gravity on mass 1 kg is 10 n.
A body falls freely under gravity from rest. Name the kind of energy it will possess at the point from where it falls.
What happens to the potential energy of a body when its height is doubled?
A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? (Assume g = 10 m/s2).
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)
When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?
The energy, possessed by an object due to its position is called ______.
Which of the following is the example potential energy?
