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3 years ago

A mechanical device requires 500j of work to do 200j of work in lifting a box. What is the efficiency of the device?

Physics

1 answer:

olga55 [171]3 years ago

5 0

40% the formula is work output/work input*100 so
200/500=.4*100=40

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Explanation:

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From the first equation

$t=\dfrac{d}{9.1}$

Put the value of t in equation (II)

$d =5.7\times(\dfrac{d}{9.1}+71)$

$\dfrac{9.1d-5.7d}{9.1}=71\times5.7$

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$d =1083.24\ km$

Hence, The distance away the center of the earthquake is 1083.24 km.

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