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प्रश्न
उत्तर
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संबंधित प्रश्न
State the S.I. unit of work and define it.
State the SI unit of work.
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Fill in the blank with suitable word :
1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
How many watts equal one horse power?
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
What is the relationship between Nm and dyne cm?
Is power a scalar quantity?
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
Fill in the boxe to show the corresponding energy transformation.
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.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
