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Chapter 9: Q2 CQ (page 314)
Under what conditions can a rotating body be in equilibrium? Give an example.
The total torque is zero and the angular acceleration will be zero and angular velocity remains constant.
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Swimmers and athletes during competition need to go through certain postures at the beginning of the race. Consider the balance of the person and why start-offs are so important for races.
Question: (a) What force should the woman inFigure 9.45exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed. (b) The triceps muscle at the back of her upper arm has an effective lever arm of 1.75cm, and she exerts force on the floor at a horizontal distance of 20.0cm from the elbow joint. Calculate the magnitude of the force in each triceps muscle, and compare it to her weight. (c) How much work does she do if her center of mass rises 0.240m? (d) What is her useful power output if she does 25pushups in one minute?
If the maximum force the biceps muscle can exert is , can we pick up an object that weighs? Explain your answer.
Why are the forces exerted on the outside world by the limbs of our bodies usually much smaller than the forces exerted by muscles inside the body?
Certain types of dinosaurs were bipedal (walked on two legs). What is a good reason that these creatures invariably had long tails if they had long necks?
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