In Fig. 8.4a, if the arm makes a angle with the horizontal and a torque of 18 m ∙ N is to be produced, what force must the biceps muscle supply?
Answer to relevant QuestionsWhich has a greater Young’s modulus, a steel wire or a rubber band? Explain. An ice cube floats in a glass of water. As the ice melts, how does the level of the water in the glass change? Would it make any difference if the ice cube were hollow? Explain. (a) Why is blood pressure usually measured at the arm? (b) Suppose the pressure reading were taken on the calf of the leg of a standing person. Would there be a difference, in principle? Explain. (a) Which of the liquids in Table 9.1 has the greatest compressibility? Why? (b) For equal volumes of ethyl alcohol and water, which would require more pressure to be compressed by 0.10%, and how many times more? A75.0-kg athlete performs a single-hand handstand. If the area of the hand in contact with the floor is 125 cm2, what pressure is exerted on the floor?
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