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प्रश्न
Rocket works on the principle of conservation of
विकल्प
mass
energy
momentum
velocity
उत्तर
momentum
Explanation:
Rocket works on the principle of conservation of momentum.
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संबंधित प्रश्न
Classify the following amongst contact and non - contact forces:
Frictional force
Normal reaction force
Force of tension in a string
Gravitational force
Electrostatic force
Magnetic force
Give one example in each case where :
The force is of contact, and
Force is at a distance
Which of the following is a contact force:
A ball moving on a table top eventually stops. Explain the reason .
A car initially at rest, picks up a velocity of 72 kmh−1 in 20 seconds. If the mass of the car is 1000 kg, find
- Force developed by its engine
- Distance covered by the car.
Multiple Choice Question. Select the correct option.
Action-reaction forces
The water sprinkler used for grass lawns begins to rotate as soon as the water is supplied. Explain the principle on which it works.
In the circuit shown in figure, when the key is closed, the compass needle placed in the match box deflects. Name the force which cases this deflection.
In the circuit shown in figure, when the key is closed, the compass needle placed in the match box deflects. Name the force which cases this deflection.
While sieving grains, small pieces fall down. Which force pulls them down?
