2125 IS 20 10 t. (Chapt 12) Consider end of a steel beam of length1 side of a bu

Question

2125 IS 20 10 t. (Chapt 12) Consider end of a steel beam of length1 side of a building. A rope is attached midway along the beam making an an 0-23.8 with the horiaon and atached to the side o a construction worker of mass-78.5 kg standing at the 10.0 m and mass M 715 kg that is attached to the the building as shown in the figure below pivot point (a) (6 pts) Draw and label the force vectors on the beam excluding forces at or on the pivot point. Since this is a torque problem, it is important to accurately place where the forces act on the beam (b) (5 pts) What is the torque exerted by the construction worker on the steel beam about the pivot point? (c) (5 pts) What is the torque exerted by the mass of the steel beam itself about the pivot point? 3 of 8

Explanation / Answer

2. (A) Fg = G M1 m2 / d^2

Fg = (6.67 x 10^-11)(5.98 x 10^24) (7.36 x 10^22) / (3.84 x 10^8)^2

Fg = 1.99 x 10^20 N  

(B) from newton's 3rd law,

action reaction forces are same in magniude but opposite in direction.

so magnitude of force = 1.99 x 10^20 N

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