A spring 40 mm long is stretched by the application of a force. If 10 N force required to stretch the spring through 1 mm, then work done in stretching the spring through 40 mm is

1. 84J

2. 68J

3. 23J

4. 8J

Subtopic:  Elastic Potential Energy |
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Two springs with spring constants k1 = 1500 N/m and k2 = 3000 N/m are stretched by the same force. The ratio of potential energy stored in the springs will be 

1. 2:1

2. 1:2

3. 4:1

4. 1:4

Subtopic:  Elastic Potential Energy |
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A block of mass 2 kg moving with velocity of 10 m/s on a smooth surface hits a spring of force constant 80×103 N/m as shown. The maximum compression in the spring is

1. 5 cm

2. 10 cm

3. 15 cm

4. 20 cm

Subtopic:  Elastic Potential Energy |
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A body starts moving from rest in straight line under a constant power source. Its displacement in time t is proportional to

(1) t1/2

(2) t

(3) t3/2

(4) t2

Subtopic:  Power |
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A block of mass m = 25 kg on a smooth horizontal surface with a velocity v =3 ms-1 meets the spring of spring constant k = 100 N/m fixed at one end as shown in the figure. The maximum compression of the spring and velocity of the block as it returns to the original position respectively are: 

                     3523

1.  1.5 m, -3 ms-1

2.  1.5 m, 0 ms-1

3.  1.0 m, 3 ms-1

4.  0.5 m, 2 ms-1

Subtopic:  Elastic Potential Energy |
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The velocity, given to the block of mass (m), is 72gl to rotate it in a circle of radius l. Calculate the height (h) where the block leaves the circle.

1. 3l2

2. 4l3

3. 5l4

4. None of these

Subtopic:  Work Energy Theorem |
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If length of string is l = 103m, TmaxTmin=4

where Tmax= Maximum tension in the stringTmin=Minimum tension in the string.Velocity at highest point is -

1.  10 m/s

2.  20 m/s

3.  102m/s

4.  103 m/s

Subtopic:  Work Energy Theorem |
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The relation between velocity (v) and time (t) is vt, then which one of the following quantity is constant?

1.  Force

2.  Power

3.  Momentum

4.  Kinetic Energy

Subtopic:  Power |
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A particle is moving on the circular path of the radius (R) with centripetal acceleration ac=k2Rt2. Then the correct relation showing power (P) delivered by net force versus time (t) is 

1. 1

2. 2

3. 3

4. 4

Subtopic:  Power |
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A steel wire can withstand a load up to 2940 N. A load of 150 kg is suspended from a rigid support. The maximum angle through which the wire can be displaced from the mean position, so that the wire does not break when the load passes through the position of equilibrium, is (2008 E)

1. 30°

2. 60°

3. 80°

4. 85°

Subtopic:  Work Energy Theorem |
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