2015
Mathematics
67ca00ce0c643c71d77dee1f
The extension of a stretched string is directly proportional to its tension. If the extension produced by a tension of 8 Newton’s is 2cm, find the extension produced by a tension of 12 newton’s.
A.
2
B.
1
C.
0
D.
3
Correct Answer: 3
Explanation
Let the extension be E and the tension be T. Then E∝T E=kT when T = 8N, E = 2cm 2=k × 8 k = 2/8 = 0.25 ∴ E = 0.25T when T = 12N, E = 0.25 × 12 =3 cm
Let the extension be E and the tension be T. Then E∝T E=kT when T = 8N, E = 2cm 2=k × 8 k = 2/8 = 0.25 ∴ E = 0.25T when T = 12N, E = 0.25 × 12 =3 cmTHIS WEEK's
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