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Chapter 5: 4Q (page 206)

Question: Tarzan swings back and forth on a vine. At the microscopic level, why is the tension force on Tarzan by the vine greater than it would be if he were hanging motionless?

Short Answer

Expert verified

Answer

As the vine stretches more, that pulls up more Tarzan.

Step by step solution

01

Definition of the motionless situation

At motionless the speed is constant, so the rate change of the magnitude of the momentum is zero.

Someone or something that does not move is said to be motionless. The thing has the potential to remain still for hours at a time, much like a statue.

02

Analysis of the forces on Tarzan

For changing the direction of the momentum, additional force is required. If Tarzan's momentum is invariant, no net amount of force would be needed.

However, an upward net force is required to shift Tarzan's motion from horizontal to upward.

Extra strain on the vine is required to change Tarzan's momentum's direction.

Therefore, the vine stretches more, pulling up more on Tarzan.

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Most popular questions from this chapter

A small block of mass is attached to a spring with stiffnessksand relaxed lengthL.The other end of the spring is fastened to a fixed point on a low-friction table. The block slides on the table in a circular path of radiusR > L. How long does it take for the block to go around once?

Question: Tarzan swings from a vine. When he is at the bottom of his swing, as shown in Figure 5.63, which is larger in magnitude: the force by the Earth on Tarzan, the force by the vine (a tension force) on Tarzan, or neither (same magnitude)? Explain how you know this.

A child rides on a playground merry-go-round, from the center. The merry-go-round makes one complete revolution every 5 s. How large is the net force on the child? In what direction does the net force act?

A box of mass 40 kghangs motionless from two ropes, as shown in Figure. The angle is 38°. Choose the box as the system. The xaxis runs to the right, the yaxis runs up, and the zaxis is out of the page.

(a) Draw a free-body diagram for the box.

(b) Isdp→/dtof the box zero or nonzero?

(c) What is the ycomponent of the gravitational force acting on the block? (A component can be positive or negative).

(d) What is theycomponent of the force on the block due to rope 2?

(e) What is the magnitude of localid="1657085603204" F→2?

(f) What is thexcomponent of the force on the block due to rope 2?

(g) What is the xcomponent of the force on the block due to rope 1?

Tarzan swings from a vine. When he is at the bottom of his swing, as shown in Figure 5.63, which is larger in magnitude: the force by the Earth on Tarzan, the force by the vine (a tension force) on Tarzan, or neither (same magnitude)? Explain how you know this.
See all solutions

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