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प्रश्न
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
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उत्तर
Kilowatt is the unit of power and kWh is the unit of energy
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संबंधित प्रश्न
Write the expression for work done by a force.
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
What is the condition for a force to do work on a body?
The work done on an object does not depend on ______.
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Give two examples of work done.
Write an expression for the work done against gravity.
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?
