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I am Lyosha [343]
3 years ago
7

A force of 100. newtons is used to move an object a distance of 15 meters with a power of 25 watts. Find the time it takes to do

the work.
Physics
1 answer:
Flauer [41]3 years ago
3 0
<h3>It takes 60 seconds to do the work</h3>

<em><u>Solution:</u></em>

Given that,

Force = 100 newtons

Distance = 15 meters

Power = 25 watts

To find: time it takes to do the work

<em><u>Find the work done:</u></em>

work = force \times displacement\\\\work = 100\ newtons \times 15\ meters\\\\work = 1500\ joule

<em><u>Find the time taken</u></em>

power = \frac{work}{time}\\\\25\ watts = \frac{1500\ joule}{time}\\\\time = \frac{1500\ joule}{25\ watt}\\\\time = 60\ second

Thus it takes 60 seconds to do the work

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 K_a = 8,111 J

Explanation:

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          p₀ = 0

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          p_f = m_a v_a + m_b v_b

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          0 = m_a v_a + m_b v_b

tells us that

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           0 = 8 m_b v_a + m_b v_b

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           73 = ½ m_a (v_a² + v_b² / 8)

           

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           73 = ½ m_a (v_a² + 8² v_a² / 8)

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           73/9 = ½ m_a (v_a²) = K_a

            K_a = 8,111 J

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