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The length of a rubber cord is l1 metres...

The length of a rubber cord is `l_1` metres when the tension in it is 4N and `l_2` metres when the tension is 5N. Then the length in meters when the tension is 9 N is

A

`5l_1 - 4l_2`

B

`4l_1 - 5l_2 `

C

`10l_1 - 8l_2 `

D

`8l_1 - 10l_2 `

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-MECHANICAL PROPERTIES OF SOLIDS-EXERCISE - 2 (YOUNG.S MODULUS)
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  2. A metallic ring of radius r and cross-sectional area A is fitted into ...

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  3. The length of a rubber cord is l1 metres when the tension in it is 4N ...

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  4. When a metal sphere is suspended at the end of a metal wire its extens...

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  5. A wire whose cross-sectional area is 4 mm^2 is stretched by 0.1 mm by...

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  6. When a tension 'F' is applied, the elongation produced in uniform wire...

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  7. Two wires A and B have Young's modulii in the ratio 1:2 and ratio of l...

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  8. A wire stretched by 0.01 m when it is stretched by a certain force. An...

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  9. A steel wire is 1m long and 1mm^2 in area of cross-section. If it tak...

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  11. An iron wire of length 4m and diameter 2mm is loaded with a weight of ...

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  12. Two wires of same material have masses in the ratio 3:4 the ratio of t...

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  13. Two exactly similar wires of steel (Y=20 xx 10^11 dy//cm^2) and copper...

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  14. Two wires of same length and thickness are joined end to end. Their Yo...

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  15. A steel wire of length 20 cm is stretched to increase its length by 0....

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  16. A tungsten wire, 0.5 mm in diameter, is just stretched between two fix...

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  17. Two wires are arranged as shown in the figure. The elongations in uppe...

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  18. A uniform steel rod of length 1m and area of cross section 20 cm^2 is...

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  19. The Young's modulus of steel is twice that of brass. Two wires of the ...

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  20. A steet wire of length 4.7 m and cross - sectional area 3.0xx10^(-5)m^...

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