Tuesday, December 23, 2014

Physics Numerical for class 9

Q. 1. A toy of mass 0.1kg acquires a spped of 5 m/s when pushed forward. Ahat is the impulse given to the toy?

Q. 2. A projectile weighing 200kg is fired from a gun with a velocity of 500m/s. If the velocity of recoil of the gun is 12.5m/s calculate the mass of the gun.

Q. 3. A car of mass 2500kg accelerates at the rate of 4m/s2 and then at the rate of 16 m/s2. Calculate t6he ratio of the forces exerted by the engine in the two cases.

Q. 4. A driver accelerates his car first at the rate of 1.8m/s2 and then at the rate of 1.2m/s2 calculate the ration of the forces exerted by the engines.

Q. 5. A body of mass 5 kg undergoes a change in speed from 30 to 40m/s . calculate its increase in momentum.

Q. 6. A body of mass 100g is moving with a velocity of 15m/s Find the momentum associated with the ball.

Q. 7. body of mass 5 kg is moving with a uniform velocity of 10m/s It is acted upon by a force of 20N What will be its velocity after 1s.

Q. 8. In order to gain a velocity of 12m/s how long should a force of 30N be exerted on a body of mass 5kg?

Q. 9. The velocity of a body of mass 5kg reduces from 10 m/s to 5 m/s. What is the change in momentum of the body?

Q. 10. A 5 kg rifle fires a 10g bullet at a velocity of 500m/s find the recoil velocity of the rifle.

Q. 11. A block of mass 3kg has a velocity of um/s. When a force of 18N acts on the block, it reduces the velocity from U to U/2 after the block has covered a distance of 9 m . Find U

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