While a person is walking, his arms swing through approximately a 45.0 degree an
ID: 2178525 • Letter: W
Question
While a person is walking, his arms swing through approximately a 45.0 degree angle in 0.530 s. As a reasonable approximation, we can assume that the arm moves with constant speed during each swing. A typical arm is 70.0 cm long, measured from the shoulder joint.(a) What is the acceleration of a 0.500 gram drop of blood in the fingertips at the bottom of the swing?
(b) Find the force that the blood vessel must exert on the blood in part 9 (a).
(c)What force would the blood vessel exert if the arm were not swinging?
Explanation / Answer
45° = p/4 rad w = T/t = (p/4)/.5 = p/2 rad/sec a = g + R*w² = 9.8 + .70*(p/2)² = 11.53 m/s² down If you also want to find the force on the drop of blood, F = m*a = .0013*a = .015 N down
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