REMARKS The magnitude of the force supplied by the biceps must be about ten time
ID: 3309132 • Letter: R
Question
REMARKS The magnitude of the force supplied by the biceps must be about ten times as large as the bowling ball it is supporting!
QUESTION Suppose the biceps were surgically reattached three centimeters farther toward the person's hand. If the same bowling ball were again held in the person's hand, how would the force required for the biceps be affected? Explain? (Select all that apply.)
It would require more force because of the larger distance between the elbow and the location where the force from the biceps acts.
It would require less force because of the larger distance between the elbow and the location where the force from the biceps acts
.It would require less force because the torque for each newton of force from the biceps is greater
.It would require more force because the force is less nearly perpendicular to the moment arm.
It would require more force because the force acts closer to the heavy bowling ball.
PRACTICE IT
F = N R = NExplanation / Answer
The net force on the system should be zero for equilibrium
so, 48.4 + R = F
where F = upwards force from Biceps acting at a distance of d = 0.02966m
R = downward force from humerus acting at a distance of d = 0 m
now, the net torque on the system should also be zero for equilibrium
therefore, taking torque about the joint gives,
R(0) + 0.02966(F) - 0.346(48.4) = 0
=> F = 56.461 N
this is the upward force
note that if the biceps are shifted by 3 cm [0.03m] then from the equation above, the force F will decrease since the torque increased [due to increase in distance].
using F = 56.461 N, the downward force will be:
R = 56.461 - 48.4 = 8.06 N.
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