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viktelen [127]
3 years ago
6

A crane motor exerts 3,500 W to lift a load up 5 floors in 25 seconds. How much work did the crane do?

Physics
1 answer:
jok3333 [9.3K]3 years ago
4 0

Answer: 87500J

Explanation:

Given that,

Power exerted by crane = 3,500 W

Time taken = 25 seconds

work done by crane = ?

Since power is the rate of work done per unit time, then power is workdone by the crane divided by the time taken.

i.e power = work / time

3,500 W = work / 25 seconds

Work = 3500W x 25 seconds

Work = 87500J

Thus, 87500 joules of work was done by the crane.

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If an electron moves in a circle of radius 21 cm perpendicular to a B field of 0.4 T, what are the speed of the electron and the
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Answer:

a)

v = 4.048 *10^6 m/s

b)  

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Explanation:

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v =  \frac{qBr}{m}

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mass of the electrons = 6.64 * 10^{-27} Kg

a)

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v = \frac{3.2 * 10^{-19}*0.4*0.21}{6.64 * 10^{-27}} \\v = 4.048 *10^6m/s

b)  

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3 years ago
There are many theories as to why ice ages occur. The currently accepted theory is that ice ages are caused by _____.
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4 years ago
4. A 15 V battery is connected to three capacitors in series. The capacitors have the following
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A man runs 800m due north in 110 seconds followed by 400m due suoth in 90 seconds calculate his average speed and his average ve
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Answer:

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t is time

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speed due south is 400m and 90s  

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