Assume that the humerus is vertical and that= 0 , when the forearm is also vertical. Assume that biceps is the only active muscle and that its line of action points toward the shoulder such that it makes an angle,= - 5owith the forearm (on the humerus side of the biceps). For this model, assume that the distance between the elbow and the biceps insertion is 5 cm and the distance between the elbow and forearm/hand center of mass is 15 cm. Assume that the mass of the forearm/hand is 2 kg and that its moment of inertia about the elbow is 300 kg-cm .

Find resulting biceps muscle force, and tangential and normal components of the reaction force for the movement from t = 0 seconds. Assume that in that range the forearm/hand is undergoing constant angular acceleration of = 100 radians/second and that at t = 0 seconds,= 15oand the angular velocity is = 2 radians/second.

The figure below shows the relevant dynamic components that must be considered. (Note that this figure uses a horizontal reference for and that the problem uses a vertical reference.)