In order to make an adjustment, a group of engineering students remove leg D from a laboratory worktable. To ensure that the table remains stable, they place a 7.3-kg stack of statics textbooks centered at point E of the tabletop as shown. Determine the normal reaction force at each leg A, B, and C. The uniform tabletop has a mass of 35.1 kg, and each leg has a mass of 6.0 kg. 7.3 kg 0.6 m 0.5 m 2.0 m 0.9 m N A E B NB Answers: B = Nc = One of the smooth vertical walls supporting end B of the 285-kg uniform shaft is turned through a 31 angle as shown here. End A is supported by the ball-and-socket connection in the horizontal x-y plane. Calculate the magnitudes of the forces P and R exerted on the ball end B of the shaft by the vertical walls C and D, respectively. Part 1 D B 5.0 m 6.2 m 319 2.0 m Our first task is to find the vertical distance from the origin of the coordinate system to point B. This distance is labeled h in the figure. Answer: h = m