Question 10 During a biceps isometric exercise, a dumbbell is held stationary wi

Question

Question 10 During a biceps isometric exercise, a dumbbell is held stationary with the elbow bent at 90° and the shoulder relaxed. Neglecting the weight of the forearm, which of the following is true? 0 A. The force exerted by the biceps equals the weight of the dumbbell, the torque caused by the tension in the biceps equals that caused by the dumbbell's weight. O B. The force exerted by the biceps is greater than the weight of the dumbbell; the torque caused by the tension in the biceps equals that caused by the dumbbell's weight. C. The force exerted by the biceps is less than the weight of the dumbbell; the torque caused by the tension in the biceps equals that caused by the dumbbell's weight. D. The force exerted by the biceps equals the weight of the dumbbell; the torque caused by the tension in the biceps is greater than that caused by the dumbbell's weight. Review Next 13,866

Explanation / Answer

As the dumbbell is held stationary, no net force/torque acts on it.

As soon as there is a motion or rotation, force or torque acted on the dumbbell.

Now at 90°it is it stationary, therefor no motion.

Hence force exerted by arms/biceps equal weight of dumbbell while torque due to tension in biceps equals due to its weight.

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