Find the force that the biceps muscle shown in the figure exerts on the forearm

Question

Find the force that the biceps muscle shown in the figure exerts on the forearm when you lift a 11-kgbarbell with your hand. Let the barbell be l = 0.35 m from the elbow joint, and the biceps be d = 0.050 mfrom the joint.

Express your answer to two significant figures and include the appropriate units.

Determine the force that the bone in the upper arm (the humerus) exerts on the bone in the forearm at the elbow joint.

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

net torque is zero

Torque due to biceps = torque due to barbell

11*9.81*0.35 = FB*0.05

FB = 755.37 N

--------------------------

net force = 0

FB-FUB-W =0

FUB = FB-W= 755.37-(11*9.81) = 647.46 N

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.