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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 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鈥檚 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.
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.
Commercial airplanes are sometimes pushed out of the passenger loading area by a tractor.
(a) An 1800-kg tractor exerts a force of 1.75脳104 N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. If the acceleration is 0.150 m/s2, what is the mass of the airplane?
(b) Calculate the force exerted by the tractor on the airplane, assuming 2200 N of the friction is experienced by the airplane.
(c) Draw two sketches showing the systems of interest used to solve each part, including the free-body diagrams for each.
A device used since the 1940 s to measure the kick or recoil of the body due to heart beats is the 鈥渂allistocardiograph.鈥� What physics principle(s) are involved here to measure the force of cardiac contraction? How might we construct such a device?
Consider the baby being weighed in Figure 4.34.
(a) What is the mass of the child and basket if a scale reading of 55 N is observed?
(b) What is the tension T1 in the cord attaching the baby to the scale?
(c) What is the tension T2 in the cord attaching the scale to the ceiling, if the scale has a mass of 0.500 kg?
(d) Draw a sketch of the situation indicating the system of interest used to solve each part. The masses of the cords are negligible.
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