The breaking stress of a wire depends upon:

1. material of the wire.

2. length of the wire.

3. radius of the wire.

4. shape of the cross-section.

Subtopic:  Stress - Strain |
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A force F is needed to break a copper wire having radius R. The force needed to break a copper wire of radius 2R will be:
1. F/2                                     
2. 2F 
3. 4F
4. F/4

Subtopic:  Stress - Strain |
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A steel cable with a radius of 1.5 cm supports a chairlift at a ski area. If the maximum stress is not to exceed 108 N/m2, what is the maximum load that the cable can support?
1. 7.06 x 104 N
2. 5.03 x 104 N
3. 1.09 x 104 N
4. 17 x 104 N

Subtopic:  Stress - Strain |
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The breaking stress of a wire going over a smooth pulley in the following question is 2 × 109 N/m2. What would be the minimum radius of the wire used if it is not to break?

    

1.  0.46 × 10-6 m

2.  0.46 × 10-4 m

3.  0.46 × 108 m

4.  0.46 × 10-11 m

Subtopic:  Stress - Strain |
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A light rod of length 2m is suspended from the ceiling horizontally by means of two vertical wires of equal length. A weight W is hung from the light rod as shown in the figure. The rod is hung by means of a steel wire of cross-sectional area A1=0.1 cm2 and brass wire of cross-sectional area A2=0.2 cm2. To have equal stress in both wires, T1/T2=?

1. 1/3

2. 1/4

3. 4/3

4. 1/2

Subtopic:  Stress - Strain |
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To break a wire, a force of 106 N/m2 is required. If the density of the material is 3×103 kg/m3, then the length of the wire which will break by its own weight will be:

1. 34 m

2. 30 m

3. 300 m

4. 3 m

Subtopic:  Stress - Strain |
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A uniform wire of length 3m and mass 10 kg is suspended vertically from one end and loaded at another end by a block of mass 10 kg. The radius of the cross-section of the wire is 0.1 m. The stress in the middle of the wire is: (g = 10 ms-2)

1. 1.4 x 104 N/m2

2. 4.8 x 103 N/m2

3. 96 x 104 N/m2

4. 3.5 x 103 N/m2

Subtopic:  Stress - Strain |
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lf ρ is the density of the material of a wire and σ is the breaking stress, the greatest length of the wire that can hang freely without breaking is:

1.2ρg

2. ρσg

3.ρg2σ

4. σρg

Subtopic:  Stress - Strain |
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The breaking stress of a wire depends on:
1. Length of the wire
2. Applied force
3. The material of the wire
4. Area of the cross-section of the wire

Subtopic:  Stress - Strain |
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One end of a uniform wire of length L and of weight W is attached rigidly to a point in the roof and a weight W1 is suspended from its lower end. If A is the area of cross-section of the wire , the stress in the wire at a height 3L/4 from its lower end is :-

1.  W+W1A

2.  4W+W13A

3.  3W+W14A

4.  34W+W1A

Subtopic:  Stress - Strain |
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