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प्रश्न
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
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
Work is said to be done by a forte only when ................
When does a force perform work?
Give reasons for the following. No work is done if a man is pushing against a wall.
State the energy transformation on the following:
Electricity is obtained from solar energy.
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
A car is being driven by a force of 2.5 ✕ 1010 N. Travelling at a constant speed of 5 m/s, it takes 2 minutes to reach a certain place. Calculate the work done.
Name five appliances or machines which use an electric motor.
The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?
Its moment of a force scalar or a vector quantity?
Define 'joule'.
Complete the following sentences:
The SI unit of work is ....... and of power is .......
Name the physical quantity whose MKS units are kgm2s-3.
How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?
Give an example
Chemical energy changes to electrical energy.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
