A skeletal diagram of a hand holding aload is shown in the upper figure. If theload and the forearm have masses of 2kg and 1.2 kg, respectively, and theircenters of mass are located at G1 andG2, determine the force developed inthe biceps CD and the horizontal andvertical components of reaction at theelbow joint B. The forearm supportingsystem can be modeled as the structuralsystem shown in the lower figure.

This diagram shows muscles and tendons in the upper arm. When the biceps muscle contracts, which way does the hand move?up, toward the shoulderdown, away from the shoulderSubmit

Hold your upper arm vertical and your lower arm horizontal with your hand holding a 191 N dumb-bell, as shown in the Figure. You’ll feel that your biceps muscle has contracted and is trying to pivot your lower arm about the elbow joint (black dot in the figure). For a person with the arm dimensions shown, what force, in N, must the biceps muscle provide? You can ignore the mass of the arm and hand in your calculation.

What were the two muscles that you saw in the arm anatomy in the gizmo? Explain how they work together with the bones of the arms?

Describe how the forearm and lower leg structures are similar?

Order the diagrams to show the relationship between the length of the effort arm and the force needed to lift the weight.RESET