Advertisements
Advertisements
प्रश्न
How much work is done when a body of mass m is raised to a height h above the ground?
Advertisements
उत्तर
We can calculate the work done against gravity in moving a body of mass (m) by a height (h) as, Work done in lifting a body = (Weight of body) (Vertical distance)
So, W = (m) (g) (h)
APPEARS IN
संबंधित प्रश्न
Define 1 joule of energy.
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
State the energy transformation on the following:
Electricity is obtained from solar energy.
Complete the following sentences:
The SI unit of work is ....... and of power is .......
A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.
Give an example
Light energy changes to electrical energy.
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
