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 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. 7.06×104 N
2. 5.03×104 N
3. 1.09×104 N
4. 17×104 N

Subtopic:  Stress - Strain |
 77%
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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. 0.46×106 m 2. 0.46×104 m
3. 0.46×108 m 4. 0.46×1011 m
Subtopic:  Stress - Strain |
 72%
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A light rod of length 2 m 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, T1T2?

              

1. 13 2. 14
3. 43 4. 12
Subtopic:  Stress - Strain |
 76%
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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 3 m 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: (Take g=10 ms-2)

1. 1.4×104 N/m2 2. 4.8×103 N/m2
3. 96×104 N/m2 4. 3.5×103 N/m2
Subtopic:  Stress - Strain |
 67%
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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 |
 74%
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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 the cross-section of the wire, the stress in the wire at a height 3L4 from its lower end is:
1. W+W1A
2. 4W+W13A
3. 3W+W14A
4. 34W+W1A

Subtopic:  Stress - Strain |
 72%
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A wire can sustain a weight of 10 kg before breaking. If the wire is cut into two equal parts, then each part can sustain a weight of:

1. 2.5 kg 2. 5 kg
3. 10 kg 4. 15 kg
Subtopic:  Stress - Strain |
 75%
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The length of an elastic string is a metre when the longitudinal tension is 4 N and b metre when the longitudinal tension is 5 N. The length of the string in metre when the longitudinal tension is 9 N will be:

1. ab 2. 5b4a
3. 2b14a 4. 4a3b
Subtopic:  Hooke's Law |
 77%
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