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Chapter 9: Q9-2Q (page 230)

A bungee jumper momentarily comes to rest at the bottom of the dive before he springs back upward. At that moment, is the bungee jumper in equilibrium? Explain.

Short Answer

Expert verified

Yes, the bungee jumper is in equilibrium.

Step by step solution

01

Meaning of equilibrium

Equilibrium may be described as the situation in which the forces acting in opposite directions are perfectly balanced so that there is no tendency to change.

In this situation, the value of the net force working on the system is equivalent to zero.

02

Explanation for the equilibrium state of a bungee jumper

The bungee jumper is in equilibrium at the bottom of the dive because his weight acting vertically downward is balanced by the tension in the ropes on either side of him.

If he was not in equilibrium, he would have either come down if his weight was greater, or gone up if the tension was larger than his weight. As his body continues to be at rest, he is supposed to be in a state of equilibrium.

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Most popular questions from this chapter

A 65.0-kg painter is on a uniform 25-kg scaffold supported from above by ropes (Fig. 9–84). There is a 4.0-kg pail of paint to one side, as shown. Can the painter walk safely to both ends of the scaffold? If not, which end(s) is dangerous, and how close to the end can he approach safely?

(II) The subterranean tension ring that exerts the balancing horizontal force on the abutments for the dome in Fig. 9–34 is 36-sided, so each segment makes a 10° angle with the adjacent one (Fig. 9–77). Calculate the tension F that must exist in each segment so that the required force of\(4.2 \times {10^5}\;{\rm{N}}\)can be exerted at each corner (Example 9–13).

Name the type of equilibrium for each position of the ball in Fig. 9–40.

(II) (a) What is the minimum cross-sectional area required for a vertical steel cable from which a 270-kg chandelier is suspended? Assume a safety factor of 7.0. (b) If the cable is 7.5 m long, how much does it elongate?

Examine how a pair of scissors or shears cuts through a piece of cardboard. Is the name “shears” justified? Explain.
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