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Chapter 4: Q21CQ (page 160)

If a leg is suspended by a traction setup as shown in Figure 4.30, what is the tension in the rope?

Short Answer

Expert verified

The tension in the rope is equal to the weight of the leg.

Step by step solution

01

Concept of Normal Force

Whatever supports a load, it must supply an upward force equal to the weight of the load. This upward force is called the normal force.

02

Determine the tension in the rope

Whatever supports a load, it must supply an upward force called normal force, which is equal to the weight of the load.

Here, the leg is supported by a rope. So, the rope must supply an upward force in the form of tension which must be equal to the weight of the leg.

Hence, the tension in the rope is equal to the weight of the leg.

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Most popular questions from this chapter

A 63.0 kg sprinter starts a race with an acceleration of 4.20 m/s2. What is the net external force on him?

Propose a force standard different from the example of a stretched spring discussed in the text. Your standard must be capable of producing the same force repeatedly.

(a) What is the final velocity of a car originally traveling at 50.0 km/h that decelerates at a rate of 0.400 m/s2 for 50.0 s?

(b) What is unreasonable about the result?

(c) Which premise is unreasonable, or which premises are inconsistent?

Figure 4.39 shows Superhero and Trusty Sidekick hanging motionless from a rope. Superhero’s mass is 90.0 kg, while Trusty Sidekick’s is 55.0 kg, and the mass of the rope is negligible.

(a) Draw a free-body diagram of the situation showing all forces acting on Superhero, Trusty Sidekick, and the rope.

(b) Find the tension in the rope above Superhero.

(c) Find the tension in the rope between Superhero and Trusty Sidekick. Indicate on your free-body diagram the system of interest used to solve each part.

Consider the tension in an elevator cable during the time the elevator starts from rest and accelerates its load upward to some cruising velocity. Taking the elevator and its load to be the system of interest, draw a free-body diagram. Then calculate the tension in the cable. Among the things to consider are the mass of the elevator and its load, the final velocity, and the time taken to reach that velocity.

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