In Figure 1-7, the biceps is acting on the forearm. What is the force of the biceps, FB, given the following: moment arm of the biceps, d = 0.02 m and torque due to the biceps, TM = -5 Nm?
a. -0.1 N
b. 1,250 N
c. 5 N
d. -250 N
ANS: D
Because T = (F) (MA) therefore, F = T/MA: (-)5 Nm/0.02 m = (-)250 N. The negative sign is
used to show direction of the force. Due to the small moment arm, the force necessary to produce
(-)5 Nm of torque is quite large.
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