A block is placed on a rough horizontal plane. A time dependent horizontal force F=kt acts on the block. The acceleration time graph of the block is :

1. 2.
3. 4.

Subtopic:  Application of Laws |
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A motorcycle is going on an overbridge of radius R. The driver maintains a constant speed. As the motorcycle is ascending on the overbridge, the normal force on it:

1.  Increases

2.  decreases

3.  remains the same

4.  fluctuates erratically

Subtopic:  Non Uniform Vertical Circular Motion |
 51%
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A rod of length L and mass m is acted on by two unequal forces F1 and F2<F1 as shown in the following figure

 

The tension in the rod at a distance y from the end A is given by :

1. F11-yL+F2yL

2. F21-yL+F1yL

3. F1-F2yL

4. None of the above

Subtopic:  Application of Laws |
 56%
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Two blocks 'A' and 'B' each of mass 'm' are placed on a smooth horizontal surface. Two horizontal force F and 2F are applied on both the blocks 'A' and 'B' respectively as shown in figure. The block A does not slide on block B. Then the normal reaction acting between the two blocks is:

  

1. \(\text F\)

2. \(\text F /2\)
3. \(F \over \sqrt 3\)
4. \(3F\)

Subtopic:  Application of Laws |
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Five persons A, B, C, D & E are pulling a cart of mass 100 kg on a smooth surface and the cart is moving with acceleration 3 m/s2 in east direction. When person 'A' stops pulling, it moves with acceleration 1 m/s2 in the west direction. When person 'B' stops pulling, it moves with acceleration 24 m/s2 in the north direction. The magnitude of the acceleration of the cart when only A & B pull the cart keeping their directions same as the old directions are:

1.  26 m/s2

2.  371 m/s2

3.  25 m/s2

4.  30 m/s2

Subtopic:  Application of Laws |
 53%
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Two masses, \(m\) and \(M\), are connected by a light string passing over a smooth pulley. When mass \(m\) moves up by \(1.4\) m in \(2\) sec, the ratio \(\frac{m}{M}\) ​​​​is:

1. \(\frac{13}{15} \) 2. \(\frac{15}{13} \)
3. \(\frac{9}{7} \) 4. \(\frac{7}{9}\)
Subtopic:  Application of Laws |
 51%
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The engine of a car produces an acceleration of 4 m/s2 in the car. If this car pulls another car of the same mass, what will be the acceleration produced?

1. 8 m/s2

2. 2 m/s2

3. 4 m/s2

4. 12m/s2   

Subtopic:  Newton's Laws |
 65%
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A truck and a car are moving with equal velocity. If equal retarding force is applied on each, then on applying the brakes both will stop after certain distance 

1. Truck will cover less distance before rest

2. Car will cover less distance before rest

3. Both will cover equal distance

4. None

Subtopic:  Newton's Laws |
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PMT - 1997
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A constant force acts on a body of mass 0.9 kg at rest for 10s. If the body moves a distance of 250 m, the magnitude of the force is 

1. 3 N

2. 3.5 N

3. 4.0 N

4. 4.5 N

Subtopic:  Newton's Laws |
 80%
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A body of 5 kg is moving with a velocity of 20 m/s. If a force of 100 N is applied on it for 10 sec in the same direction as its velocity, what will now be the velocity of the body?

1. 200 m/s

2. 220 m/s

3. 240 m/s

4. 260 m/s

Subtopic:  Newton's Laws |
 84%
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PMT - 2000
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