x previous 4 of 10 next Problem 7.60 MC Part A A combination lock has a 1.5-cm-d

Question

x previous 4 of 10 next Problem 7.60 MC Part A A combination lock has a 1.5-cm-diameter knob that is part of the dial you turn to unlock the lock To turn that knob, you grip it between your thumb and forefinger with a force of 4.5 N as you twist your wrist. Suppose the coofficient of static friction between the knob and your fingers is 0.80. What is the most torque you can exert on the knob without having it sip between your fingers? Express your answer using four significant figures. Hints 5.4.10 N.m Submit My Answers Give Up ncorrect; Try Again

Explanation / Answer

Then each friction force (and there are two) is
Ff = µ*Fn = 0.80 * 4.5N = 3.6 N
max = 2 * Ff * R = 2 * 3.6N * 0.015m/2 = 0.054 N·m = 54 mN·m

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