A 5.25-kg piece of wood (SG = 0.50) floats on water. What

Chapter 4, Problem 34P

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QUESTION:

Problem 34P

A 5.25-kg piece of wood (SG = 0.50) floats on water. What minimum mass of lead, hung from the wood by a string, will cause it to sink?

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QUESTION:

Problem 34P

A 5.25-kg piece of wood (SG = 0.50) floats on water. What minimum mass of lead, hung from the wood by a string, will cause it to sink?

ANSWER:

ANSWER:The mass of the fireman is 80 kg.The total vertical displacement is 4.2 meter.The final speed just before reaching the bottom is 2.2 m/s.So,The initial kinetic energy was zero, as the initial velocity was zero.Initial potential energy is mgh = 80 × 9.8 × 4.2 = 3292.8 jules, as the height was 4.2 meters.. 2 2Final kinetic energy was 1/2 mv = 1/2 × 80 × 2.2 = 193.6 jules, where v is the velocity atthe bottom.Final pot

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