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
The tension in the rope is equal to the weight of the leg.
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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?
The tension in the rope is equal to the weight of the leg.
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A large rocket has a mass of 2.00×106 kg at takeoff, and its engines produce a thrust of 3.50×107 N.
(a) Find its initial acceleration if it takes off vertically.
(b) How long does it take to reach a velocity of 120 km/h straight up, assuming constant mass and thrust?
(c) In reality, the mass of a rocket decreases significantly as its fuel is consumed. Describe qualitatively how this affects the acceleration and time for this motion.
A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 N on him. The mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20 m/s2 backward. (a) What is the force of friction between the losing player’s feet and the grass? (b) What force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg?
(c) Draw a sketch of the situation showing the system of interest used to solve each part. For this situation, draw a free-body diagram and write the net force equation.
How are inertia and mass related?
Two teams of nine members each engage in a tug of war. Each of the first team’s members has an average mass of 68 kg and exerts an average force of 1350 N horizontally. Each of the second team’s members has an average mass of 73 kg and exerts an average force of 1365 N horizontally.
(a) What is magnitude of the acceleration of the two teams?
(b) What is the tension in the section of rope between the teams?
Why can we neglect forces such as those holding a body together when we apply Newton’s second law of motion?
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