Problem: When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.00 kg. If the biceps is connected to the forearm a distance dbiceps = 3.50 cm from the elbow, the force Fbiceps = 113.96 N is exerted to hold a 600 g ball at the end of the forearm at distance dball = 37.0 cm from the elbow, with the forearm parallel to the floor.Which of the following should the forearm be modeled as?A. a particle moving with constant accelerationB. a flexible rod moving with constant accelerationC. a rigid rod moving with constant accelerationD. a particle in equilibriumD.a flexible rod in equilibriumE.a rigid rod in equilibrium

FREE Expert Solution

The forearm is in equilibrium. Therefore, the acceleration is zero. 

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Problem Details

When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.00 kg. If the biceps is connected to the forearm a distance dbiceps = 3.50 cm from the elbow, the force Fbiceps = 113.96 N is exerted to hold a 600 g ball at the end of the forearm at distance dball = 37.0 cm from the elbow, with the forearm parallel to the floor.

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Which of the following should the forearm be modeled as?

A. a particle moving with constant acceleration

B. a flexible rod moving with constant acceleration

C. a rigid rod moving with constant acceleration

D. a particle in equilibrium

D.a flexible rod in equilibrium

E.a rigid rod in equilibrium

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Torque Due to Weight concept. You can view video lessons to learn Torque Due to Weight. Or if you need more Torque Due to Weight practice, you can also practice Torque Due to Weight practice problems.