(II) A man doing push-ups pauses in the position shown in Fig. 9–65. His mass m = 68 kg. Determine the normal force exerted by the floor (a) on each hand; (b) on each foot. 28 cm mg 42 cm 95 cm FIGURE 9-65 Problem 25.

(II) A man doing push-ups pauses in the position shown in Fig. 9–65. His mass m = 68 kg. Determine the normal force exerted by the floor (a) on each hand; (b) on each foot. 28 cm mg 42 cm 95 cm FIGURE 9-65 Problem 25.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

(II) A man doing push-ups pauses in the position shown in
Fig. 9–65. His mass m = 68 kg. Determine the normal force
exerted by the floor (a) on each hand; (b) on each foot.
28 cm
mg
42 cm
95 cm
FIGURE 9-65 Problem 25.

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When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm with hand is 1.60 kg. If the biceps is connected to the forearm a distance of 2.4 cm from the elbow, how much force must the biceps exert to hold a 42 N ball at the end of the forearm at distance of 36.0 cm from the elbow, with the forearm parallel to the floor, in Newtons? Use g = 10.0 m/s2. Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.