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zepelin [54]
2 years ago
6

a 74.9 kg person sits at rest on an icy pond holding a physics book. he throws the physics book west at 8.25 m/s and he recoils

at 0.215 m/s what is the mass of the physics book
Physics
1 answer:
kifflom [539]2 years ago
3 0

Answer:

1.95 kg

Explanation:

Momentum is conserved.

m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂

0 = (74.9) (-0.215) + m (8.25)

m = 1.95

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A piano wire with mass 2.60g and length 84.0 cm is stretched with a tension of 25.0 N. A wave with frequency 120.0 Hz and amplit
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Answer:

Power will be 0.2023 watt

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Explanation:

We have given mass of the Piano wire m = 2.60 gram = 0.0026 kg

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So mass density \mu =\frac{m}{l}=\frac{0.0026}{0.84}=0.0031kg/m

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Power is given by P=\frac{1}{2}\sqrt{\mu T}\omega ^2A^2=\frac{1}{2}\times \sqrt{0.0031\times 25}\times 753.6^2\times 0.0016^2=0.2023watt

From the relation we can see that power P\ \propto\ A^2

So if amplitude is halved then power will be \frac{1}{4} times

So power will be equal to \frac{0.2023}{2}=0.0505watt

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