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प्रश्न
Complete the following sentences:
1 H.P. = ........ W.
उत्तर
1 H.P. = 746 W.
APPEARS IN
संबंधित प्रश्न
The S.I. unit of work is
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.
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
How much work is done when a body of mass m is raised to a height h above the ground?
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
Each of the following statement describes a force acting. Which force is causing work to be done?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Define 'joule'.
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.
Define energy and state the unit of energy and the law of conservation of energy.
Fill in the boxe to show the corresponding energy transformation.
State larger units of power.
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
A force can cause an object to change its ______.
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.
