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
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
State the law of conservation of energy.
Is work a scalar or a vector quantity?
Explain by an example that a body may possess energy even when it is not in motion.
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
The work done on an object does not depend on ______.
State the conditions of equilibrium for a rigid body.
Name the force acting away from the centre of circular path.
A girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s2, find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.
