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Chapter 7: Q7-4MCQ (page 170)

An astronaut is a short distance away from her space station without a tether rope. She has a large wrench. What should she do with the wrench to move toward the space station?

(a) Throw it directly away from the space station.

(b) Throw it directly toward the space station.

(c) Throw it toward the station without letting go of it.

(d) Throw it parallel to the direction of the station’s orbit.

(e) Throw it opposite to the direction of the station’s orbit.

Short Answer

Expert verified

(a) Throw it directly away from the space station.

Step by step solution

01

Understanding the net momentum

The net momentum for the astronaut-wrench system is equivalent to zero if you consider the system to be isolated. In this case, the astronaut can move towards the space station by throwing the wrench away from the station.

02

Evaluation of the direction of the motion of the wrench

When the astronaut throws the wench away from the station, he moves towards the station as the wench exerts an equal and opposite recoil momentum on him.

Thus, option (a) is the correct answer.

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Most popular questions from this chapter

You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 45 km/h. A new model of mass 1500 kg takes 0.15 s from the time of impact until it is brought to rest. (a) Calculate the average force exerted on the car by the barrier. (b) Calculate the average deceleration of the car in g’s.

Two balls, of masses\({m_{\rm{A}}} = 45\;{\rm{g}}\)and\({m_{\rm{B}}} = 65\;{\rm{g}}\), are suspended as shown in Fig. 7–46. The lighter ball is pulled away to a 66° angle with the vertical and released.

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(c) What will be the maximum height of each ball after the elastic collision?

A (lightweight) pallet has a load of ten identical cases of tomato paste (see Fig. 7–39), each of which is a cube of length \(l\). Find the center of gravity in the horizontal plane, so that the crane operator can pick up the load without tipping it.

FIGURE 7-39

Problem 53.

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