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# Below is a diagram of a baseball/forearm system at rest. It is acted on by four different forces:

Below is a diagram of a baseball/forearm system at rest. It is acted on by four different forces: the weight of the forearm, the weight of the baseball, the bicep force, and a force from the upper arm bone (attached at the elbow).

Use the following values:
length of forearm = L = 17 cm
elbow to bicep distance = d = 3 cm
mass of forearm = M = 3 kg
mass of baseball = m = 1 kg

Questions:
a.)How large is the force exerted by the bicep?
b.)The force exerted by the upper arm bone (not shown above) on the forearm must be:

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