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Chapter 9: Q5MCQ (page 230)

Two children are balanced on opposite sides of a seesaw. If one child leans inward toward the pivot point, her side will

(a) rise.

(b) fall.

(c) neither rise nor fall.

Short Answer

Expert verified

The correct option is (a).

Step by step solution

01

Concepts

The torque equals the product of the force and the perpendicular distance of the force from the pivot point. When the force comes closer to the pivot point, the magnitude of the torque decreases.

02

Explanation

When the seesaw is at equilibrium, the net torque on it is zero, i.e., the torque due to the children on both sides of the seesaw creates the same torque at the pivot point.

If one child leans inward to the pivot point, her distance from the pivot point decreases. So, the torque produced by that child decreases.

Therefore, the seesaw rises in her side.

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Most popular questions from this chapter

A woman is balancing on a high wire, which is tightly strung, as shown in Fig. 9–45. The tension in the wire is

(a) about half the woman’s weight.

(b) about twice the woman’s weight.

(c) about equal to the woman’s weight.

(d) much less than the woman’s weight.

(e) much more than the woman’s weight.

As you increase the force that you apply while pulling on a rope, which of the following is not affected?

(a) The stress on the rope

(b) The strain on the rope

(c) The Young’s modulus of the rope

(d) All of the above

(e) None of the above

(II) The Leaning Tower of Pisa is 55 m tall and about 7.7 m in radius. The top is 4.5 m off center. Is the tower in stable equilibrium? If so, how much farther can it lean before it becomes unstable? Assume the tower is of uniform composition.

(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?

(II) If 25 kg is the maximum mass mthat a person can hold in a hand when the arm is positioned with a 105° angle at the elbow as shown in Fig. 9–74, what is the maximum force\({F_{{\bf{max}}}}\) that the biceps muscle exerts on the forearm? Assume the forearm and hand have a total mass of 2.0 kg with a CG that is 15 cm from the elbow, and that the biceps muscle attaches 5.0 cm from the elbow.
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