Question
solve each please
A 17-kg ladder has a center of mass at G. If the coefficients of friction at A and B are mu A = 0.3 and mu B = 0.2, respectively, determine the smallest horizontal force that the man must exert of the ladder at point C in order to push the ladder forward. A uniform beam has a mass of 18 kg and rests on two surfaces at points A and 8. Determine the maximum distance x to which the girl can slowly walk up the beam before it begins to slip. The girl has a mass of 50 kg and walks up the beam with a constant velocity. The boy at D has a mass of 50 kg, a center of mass at G, and stands on a plank at the position shown. The plank is pin-supported at A and rests on a post at B. Neglecting the weight of the plank and post, determine the magnitude of force P his friend (?) at E must exert in order to pull out the post. Take mu B = 0.3 and mu C = 0.8.
Explanation / Answer
1.B
2.C
3.A
