An 83-kg lumberjack stands at one end of a 370-kgfloating log, as shown in the f

Question

An 83-kg lumberjack stands at one end of a 370-kgfloating log, as shown in the figure (Figure 1) . Both the log and the lumberjack are at rest initially.

PART A

If the lumberjack now trots toward the other end of the log with a speed of 2.7 m/s relative to the log, what is the lumberjack's speed relative to the shore? Ignore friction between the log and the water.

Express your answer using two significant figures.

PART B

If the mass of the log had been greater, would the lumberjack's speed relative to the shore be greater than, less than, or the same as in part A?

PART C

Explain why?

Explanation / Answer

a)

here by using the formula

v = 370 * 2.7 / ( 83 + 370)

v = 2.205 m/s

the lumberjack's speed relative to the shore is 2.205 m/s

b)

if the mass of the log had been greater the lumberjack's speed relative to the shore would have been greater then that found in part (A) because the log would have moved slower in the negative direction

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.