A weightlifter is performing dumbbell biceps curls holding a 105 N weight in the

Question

A weightlifter is performing dumbbell biceps curls holding a 105 N weight in their hand. The distance from the weight to their elbow is 0.35 m

A. The angle between the line of pull of the biceps and the forearm is 30-degrees when the relative angle of the elbow is 60-degrees. What is the torque created by the weight about the elbow?

B. At which relative angle of the elbow will the weightlifter need to more force to hold the weight at that angle?

a. the relative angle of the elbow of 155-degrees

b. the relative angle of the elbow of 90-degrees

c. the relative angle of the elbow of 30-degrees

Explanation / Answer

a) torque = cross of r anf F vector

= 105 * 0.35 * 0.5

=18.375 Nm

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