A lift is going up. The total mass of the lift and the passenger is 1500 kg. The variation in the speed of the lift is as given in the graph. The tension in the rope pulling the lift at t = 11th sec will be

(1) 17400 N

(2) 14700 N

(3) 12000 N

(4) Zero

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A lift is going up. The total mass of the lift and the passenger is 1500 kg. The variation in the speed of the lift is as given in the graph. The height to which the lift takes the passenger is

(1) 3.6 meters

(2) 8 meters

(3) 1.8 meters

(4) 36 meters

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A player caught a cricket ball of mass 150 gm moving at a rate of 20 m/s. If the catching process be completed in 0.1 s, then the force of the blow exerted by the ball on the hands of the player is 

(1) 0.3 N

(2) 30 N

(3) 300 N

(4) 3000 N

Concept Questions :-

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A rocket has a mass of 100 kg. 90% of this is fuel. It ejects fuel vapours at the rate of 1 kg/sec with a velocity of 500 m/sec relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is 

(1) Zero

(2) 500 N

(3) 1000 N

(4) 2000 N

Concept Questions :-

Variable mass system
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In which of the following cases forces may not be required to keep the

(1) Particle going in a circle

(2) Particle going along a straight line

(3) The momentum of the particle constant

(4) Acceleration of the particle constant

Concept Questions :-

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A ball of mass 150g starts moving with an acceleration of 20 m/s2. When hit by a force, which acts on it for 0.1 sec. The impulsive force is 

(1) 0.5 N-s

(2) 0.1 N-s

(3) 0.3 N-s

(4) 1.2 N-s

Concept Questions :-

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A body, whose momentum is constant, must have constant 

(1) Force

(2) Velocity

(3) Acceleration

(4) All of these

Concept Questions :-

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Rocket engines lift a rocket from the earth surface because hot gas with high velocity 

(1) Push against the earth

(2) Push against the air

(3) React against the rocket and push it up

(4) Heat up the air which lifts the rocket

Concept Questions :-

Variable mass system
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A force of 50 dynes is acted on a body of mass 5 g which is at rest for an interval of 3 seconds, then impulse is 

(1) 0.15×103Ns

(2) 0.98×103Ns

(3) 1.5×103Ns

(4) 2.5×103Ns

Concept Questions :-

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A bullet of mass 0.1 kg is fired with a speed of 100 m/sec, the mass of gun is 50 kg. The velocity of recoil is 

1. 0.2 m/sec

2. 0.1 m/sec

3. 0.5 m/sec

4. 0.05 m/sec

Concept Questions :-

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