Three blocks A, B, and C of masses 4 kg, 2 kg, and 1 kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied to the 4kg block, then the contact force between A and B is: 
       

1. 2 N

2. 6 N

3. 8 N

4. 18 N

Subtopic:  Application of Laws |
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A balloon with mass 'm' is descending down with an acceleration 'a' (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration 'a'?

1. 2mag+a

2. 2mag-a

3. mag+a

4. mag-a

Subtopic:  Application of Laws |
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Three blocks with masses m, 2m, and 3m are connected by strings as shown in the figure. After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity). 

        
1. 2mg
2. 3mg
3. 6mg
4. zero
Subtopic:  Application of Laws |
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A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2. If g=10 m/s2, the tension in the supporting cable is:

1. 9680 N

2. 11000 N

3. 1200 N

4. 8600 N

Subtopic:  Application of Laws |
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A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration of 1.0 ms-2. If g = 10 ms-2, the tension in the supporting cable is 

1.  9680 N

2.  11000N

3.  1200N

4.  8600 N

Subtopic:  Application of Laws |
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The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is: (g=10 m/s2)
1. 30 ms-2 downwards
2. 4 ms-2 upwards
3. 4 ms-2 downwards
4. 14 ms-2 upwards
Subtopic:  Application of Laws |
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A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of 30o with the wall. It is reflected with the same speed and at the same angle. If the ball is in contact with the wall for 0.25 s, the average force acting on the wall is:

1. 48 N

2. 24 N

3. 12 N

4. 96 N

Subtopic:  Application of Laws |
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