Advertisements
Advertisements
Question
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
Advertisements
Solution
work being done in the following cases
(b) A boy climbing up the stairs
(d) A girl moving on the road.
APPEARS IN
RELATED QUESTIONS
Define 1 J of work.
A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take 1 kgf = 10 N.
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.
Name five appliances or machines which use an electric motor.
State the conditions of equilibrium for a rigid body.
What is the work done when the object acted upon by a force remains at rest?
A weight lifted a load of 200 kgf to a height of 2.5 m in 5 s. calculate: (i) the work done, and (ii) the power developed by him. Take g= 10 N kg-1.
A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms-2).
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
