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Ilya [14]
3 years ago
15

Gray used a pulley to lift a 300 N object a distance of 3 m. It took Gray 30 seconds to lift the object. How much power did gray

exert?
A 10 watts
B 20 watts
C 30 watts
D 50 watts
Physics
1 answer:
DaniilM [7]3 years ago
6 0
The answer is c ok















I wrote this for 20 word rule
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Answer:

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Explanation:

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U_{g,A} + K_{A} = U_{g,B} + K_{B}

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I = \frac{1}{2}\cdot m \cdot r^{2}

After some algebraic handling, an expression for the maximum vertical height is derived:

m\cdot g \cdot h = \frac{1}{4}\cdot m \cdot r^{2}\cdot \omega_{o}^{2}

h = \frac{r^{2}\cdot \omega_{o}^{2}}{g}

h = \frac{(0.0108\,m)^{2}\cdot (55.2\,\frac{rad}{s} )^{2}}{9.807\,\frac{m}{s^{2}} }

h = 0.0362\,m

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