Advertisements
Advertisements
प्रश्न
A box of weight 150 kgf has gravitational potential energy stored in it equal to 14700 J. Find the height of the box above the ground. (Take g = 9.8 N kg-1)
Advertisements
उत्तर
Gravitational potential energy = 14700 J
Force of gravity = mg = 150 × 9.8N/kg = 1470N
Gravitational potential energy = mgh
14700 =1470 x h
h =10m
संबंधित प्रश्न
What are the two kinds of mechanical energy?
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force?
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
What is the work done when the object acted upon by a force remains at rest?
How many joules are there in 1 mega joule?
(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.
