A lift is moving in upward direction. The total mass of the lift and the passengers is 1600 kg. The variation of the velocity of the lift is as shown in the figure. The tension in the rope at t = 8 s will be 

1. 11200 N

2. 16000 N 

3. 48000 N

4. 12000 N

Subtopic:  Application of Laws |
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Find the acceleration of light pulley is 

1. F/m

2. F/2 m

3. F/4 m

4. F/8 m

 

Subtopic:  String Constraint |
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Consider a planet in some solar system which has a mass double the mass of the earth and density equal to the average density of the earth. An object weighing W on the earth will weight

1. W
2. 2W
3. W/2
4. W at the planet

Subtopic:  Acceleration due to Gravity |
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A boat is sent across a river a velocity of 8 . If the resultant velocity of the boat is 10 , the river is flowing with a velocity of

1. 12.8 
2. 6 
3. 8 
4. 10 

Subtopic:  Relative Motion in One Dimension |
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Two balls are thrown horizontally from the top of a tower with velocities  and  in opposite directions at the same time. After how much time, the angle between velocities of balls becomes 90º?

1. 
2. 
3. 
4. 

Subtopic:  Projectile Motion |
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A box is placed on an inclined plane and has to be pushed down. The angle of inclination is

1. equal to the angle of friction
2. more than the angle of friction
3. equal to the angle of repose
4. less than the angle of repose

Subtopic:  Friction |
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The escape velocity from the earth is about 11. The escape velocity from a planet having twice the radius and the same mean density as the earth is

1. 22 
2. 11 
3. 5.5 
4. 15.5 

Subtopic:  Escape velocity |
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A particle having a charge 10 mC is held fixed on a horizontal surface. A block of mass 80 g and having charge stays in equilibrium on the surface at a distance of 3 cm from the first charge. The coefficient of friction between the surface and the block is . Find the range within which the charge on the block may lie

1. 
2.
3.
4. 

Subtopic:  Friction |
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Two short magnets of equal dipole moments M are fastened perpendicularly at their centres as given in the figure. The magnitude of the magnetic filed at a distance d from the centre on the bisector of the right angle is 

1. μ04πmd3

2. μ04π2Md3

3. μ04π22Md3

4.  μ04π2Md3

Subtopic:  Magnetic Field & Field Lines |
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