3.6 The force system acting on the machine part is equivalent to the single force R = 80i + 20j lb acting at O. Determine the force P and the distance b. 200 lb 6 in. 80 lb 30° 3 in. 120 lb Figure P3.6 ------

The horizontal top of a concrete column is subjected to the system of forces shown. Represent the resultant of all forces as a force R at point O (COMPLETE FBD)

A man holds a 187-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 18.5 N and has a center of gravity as indicated. Find (a) the magnitude of M and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone to the forearm at the elbow joint. Upper arm bone Elbow joint 0.0510 m+ Flexor muscle -0.0890 m -0.330 m-

clockwise. (This is the info missing from the Question 2.PNG) Look at the images for details about the question.