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  • A truck is pulling a car out of a ditch by means of a steel cable that is 9.1 m long and has a radius of 5 mm.

A truck is pulling a car out of a ditch by means of a steel cable that is 9.1 m long and has a radius of 5 mm. When the car just begins to move, the tension in the cable is 800 N. How much has the cable stretched?

Answers (1)

The cable length is 9.1 m, r = 5 mm,

Tension in cable = 800 N

Y = 2 \times 10^{11} N/m^{2}

\Delta L =\frac{FL}{AY} = 800 \times \frac{9.10}{3.14\times 10 ^{-6}\times 25 \times 2 \times 10^{11}}

\Delta L = 4.64 \times 10^{-5} m

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