5. A 100 Kg shot-putter pushes forward and upward on a 4 Kg shot with a force of

Question

5. A 100 Kg shot-putter pushes forward and upward on a 4 Kg shot with a force of 1000N. The force acts at an angle of 60° above the horizontal. How much of this 1000 N force acts in the forward direction?

a. 500N     b. 866N    c. 1000N     d. 500kg     e. 160kg

6. The moment arm of the biceps brachii muscle about the elbow joint is largest when the angle at the elbow is approximately

a. 0          b. 30        c. 60          d. 90          

e. The angle of the elbow joint does not affect the moment arm of the biceps brachii muscle.

7. If a muscle is acting with a force of 100N at a distance of 5 cm from the joint center of rotation, what is the joint torque created by this force?

a. 5 Nm     b. 50 Nm    c. 500 N-cm    d. 5000 N-cm   e. need more information to calculate

Explanation / Answer

5) c 6) b 7) d

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