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katrin2010 [14]
3 years ago
6

The spring of a spring balance is 6.0 in. long when there is no weight on the balance, and it is 8.3 in. long with 9.0 lb hung f

rom the balance. How much work is done in stretching it from 6.0 in. to a length of 12.2 in.
Mathematics
1 answer:
Aleks04 [339]3 years ago
5 0

Answer:

74.958 lb-in

Step-by-step explanation:

We are given that

Natural length of spring=l=6 in

After stretching, the length of  spring=8.3 in

Weight=W=9 lb

Extension in the sprig=8.3-6=2.3 in

By hook's law

F==W=kx

Using the formula

9=k(2.3)

k=\frac{9}{2.3}=3.9 lb/in

Extension in the spring when the length of spring after stretching to 12.2 in=12.2-6=6.2 in

Work done, W=\int_{0}^{6.2}3.9xdx

W=[\frac{3.9x^2}{2}]^{6.2}_{0}

W=3.9\times \frac{(6.2)^2}{2}

W=74.958 lb-in

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