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प्रश्न
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उत्तर
Principle of moments: If a body is in equilibrium under the action of number of force, then the sum of clockwise moments is equal to the sum of anticlockwise moments.
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संबंधित प्रश्न
State the S.I. unit of energy.
.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
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.
Its moment of a force scalar or a vector quantity?
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.
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
