A ball of mass 0.5 kg moving with a velocity of 2 m/sec strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is one millisecond, the average force exerted by the wall on the ball is 

(1) 2000 N

(2) 1000 N

(3) 5000 N

(4) 125 N

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A particle moves in the xy-plane under the action of a force F such that the components of its linear momentum p at any time t are px=2cost, py=2sint. The angle between F and p at time t is 

(1) 90°

(2) 0°

(3) 180°

(4) 30°

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A satellite in force-free space sweeps stationary interplanetary dust at a rate dM/dt=αv where M is the mass, v is the velocity of the satellite and α is a constant. What is the deacceleration of the satellite 

(1) 2αv2/M

(2) αv2/M

(3) +αv2/M

(4) αv2

Concept Questions :-

Variable mass system
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Swimming is possible on account of 

(1) First law of motion

(2) Second law of motion

(3) Third law of motion

(4) Newton's law of gravitation

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On a stationary sail-boat, air is blown at the sails from a fan attached to the boat. The boat will

(1) Remain stationary

(2) Spin around

(3) Move in a direction opposite to that in which air is blown

(4) Move in the direction in which the air is blown

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A man is standing at a spring platform. Reading of spring balance is 60 kg wt. If man jumps outside platform, then reading of spring balance 

(1) First increases then decreases to zero

(2) Decreases

(3) Increases

(4) Remains same

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The tension in the spring is 

(1) Zero

(2) 2.5 N

(3) 5 N

(4) 10 N

Concept Questions :-

Spring force
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A body of mass 5kg is suspended by a spring balance on an inclined plane as shown in figure. The spring balance measure

(1) 50 N

(2) 25 N

(3) 500 N

(4) 10 N

Concept Questions :-

Spring force
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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 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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