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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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Figure 4.39 shows Superhero and Trusty Sidekick hanging motionless from a rope. Superhero鈥檚 mass is 90.0 kg, while Trusty Sidekick鈥檚 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.
A 1100-kg car pulls a boat on a trailer.
(a) What total force resists the motion of the car, boat, and trailer, if the car exerts a 1900-N force on the road and produces an acceleration of 0.550 m/s2? The mass of the boat plus trailer is 700 kg.
(b) What is the force in the hitch between the car and the trailer if 80% of the resisting forces are experienced by the boat and trailer?
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?
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.
What is the relationship between weight and mass? Which is an intrinsic, unchanging property of a body?
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