Advertisements
Advertisements
प्रश्न
Complete the following sentences:
The SI unit of work is ....... and of power is .......
Advertisements
उत्तर
The SI unit of work is joule and of power is watt
APPEARS IN
संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
The S.I. unit of work is
Differentiate between energy and power.
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
Write an expression for the work done against gravity.
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
(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?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
