3 years ago

Yor older sister drove 500 miles to college one way in ten hours. what is her average velocity?

1 answer:

8 0

Average velocity is calculated as the division of displacement and change in time so the answer would be 804 km/36000 s=0.02 m/s

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Answer:

A. 22 kg/cm2 (tensile)

Explanation:

If the temperature drops to 18C degrees (by 2 degrees), it would shrink by an amount of

$\Delta L = 11\times10^{-6}*2 = 22\times10^{-6} m$

The strain would be:

$\epsilon = \Delta L / L = 22\times10{-6} / 2 = 11\times10^{-6}$

We can calculate the stress from strain and modulus of the elasticity:

$\sigma = E\epsilon = 2\times10^6 * 11\times10^{-6} = 22 kg/cm^2$

This stress would be tensile because the bar shrinks

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