You Wish to Measure the Strength of Your Biceps Muscle

Multiple Choice

You wish to measure the strength of your biceps muscle by exerting a force on a test strap attached to a scale.When you pull on the strap,the scale moves and the movement measures the strength of your biceps.The strap is at 30 cm at the elbow and the biceps muscle is attached at a 5 cm from the pivot point.If the scale reads 20 N,the force exerted by the biceps muscle is

A) 150 N.
B) 120 N.
C) 90 N.
D) 75 N.
E) 61 N.