A person holds a gallon of milk with a mass of 3 kg away from their body so that their forearm is completely parallel with the ground. The length of the forearm is .38 meters. The biceps brachii attaches to the forearm 4 cm from the elbow at an angle of 60 deg. How much force must be exerted by the bicep in order to keep the forearm level while holding the milk

"322.5 N" is the appropriate solution.

Explanation:

The given values are:

Mass,

m = 3 kg

Length of forearm,

= .38 meters

Angle,

= 60°

As we know,

⇒  

⇒                      

On substituting the values, we get

⇒                          

⇒                          

⇒                          

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray