Advertisements
Advertisements
प्रश्न
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
Advertisements
उत्तर
When a force of 1 Newton moves a body by a distance of 1 m in its own direction, then the work done is said to be of 1 Joule. It is the standard definition of 1 Joule work done.
APPEARS IN
संबंधित प्रश्न
State two factors on which the work done on a body depends.
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
