If a spring extends by x on loading, then the energy stored by the spring is (if T is tension in the spring and k is spring constant)

(1) T22x                                     

(2) T22k

(3) 2xT2                                     

(4) 2T2k

Subtopic:  Potential energy of wire |
 81%
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When a force is applied on a wire of uniform cross-sectional area 3×10-6m2 and length 4m, the increase in length is 1 mm. Energy stored in it will be Y=2×1011N/m2

1. 6250 J                               2. 0.177 J

3. 0.075 J                              4. 0.150 J

Subtopic:  Potential energy of wire |
 67%
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A stretched rubber has:

(1) increased kinetic energy.

(2) increased potential energy.

(3) decreased kinetic energy.

(4) decreased potential energy.

Subtopic:  Potential energy of wire |
 82%
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When load of 5kg is hung on a wire then extension of 3m takes place, then work done will be

(1) 75 joule                            

(2) 60 joule

(3) 50 joule                             

(4) 100 joule

Subtopic:  Potential energy of wire |
 86%
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The stress versus strain graphs for wires of two materials A and B are as shown in the figure. If YA and YB are the Young ‘s modulii of the materials, then

(1) YB=2YA

(2) YA=YB

(3) YB=3YA

(4) YA=3YB

 

Subtopic:  Stress - Strain Curve |
 73%
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The ratio of Young's modulus of the material of two wires is 2 : 3. If the same stress is applied on both, then the ratio of elastic energy per unit volume will be-

(1) 3 : 2                                   

(2) 2 : 3

(3) 3 : 4                                   

(4) 4 : 3

Subtopic:  Potential energy of wire |
 72%
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A wire is suspended by one end. At the other end a weight equivalent to 20 N force is applied. If the increase in length is 1.0 mm, the increase in energy of the wire will be

(1) 0.01 J                               

(2) 0.02 J

(3) 0.04 J                                (4) 1.00 J

Subtopic:  Potential energy of wire |
 79%
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When shearing force is applied to a body, then the elastic potential energy is stored in it. On removing the force, this energy:

1. converts into kinetic energy.

2. converts into heat energy.

3. remains as potential energy.

4. None of the above

Subtopic:  Potential energy of wire |
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When strain is produced in a body within elastic limit, its internal energy:
1. Remains constant                  
2. Decreases
3. Increases                               
4. None of the above

Subtopic:  Potential energy of wire |
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If the force constant of a wire is \(K\), the work done in increasing the length of the wire by \(l\) is:
1. \(\frac{Kl}{2}\)
2. \(Kl\)
3. \(\frac{Kl^2}{2}\)
4. \(Kl^2\)

Subtopic:  Potential energy of wire |
 70%
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