Equilibrium Question

  • Thread starter timtng
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  • #1
timtng
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Misako wishes to measure the strength of her biceps muscle by exerting a force on a test strap. The strap is 28 cm from the pivot point at the elbow, and her biceps muscle is attached at a point 5 cm from the pivot point. If the scale reads 18 N when she exerts her maximum force, what force is exerted by the biceps muscle?

See attachment for a diagram. Please help me solve this problem.
 

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Answers and Replies

  • #2
jamesrc
Science Advisor
Gold Member
477
1
Try summing the moments about the elbow. Since the arm is in equilibrium, they should sum to zero; that is how to find the unknown bicep force.
 

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