Chapter 12, Problem 209P

The 16-ft-long cord is attached to the pin at C and passes over the two pulleys at A and D. The pulley at A is attached to the smooth collar that travels along the vertical rod. When sp = 6 ft, the end of the cord at B is pulled downward with a velocity of 3.7 ft/s and is given an acceleration of 3 ft/s². (Figure 1) Figure SA -3 ft -3 ft B D SB ▶ Determine the velocity of the collar at this instant. Express your answer to three significant figures and include the appropriate units. Enter positive value if the velocity is upward and negative value if the velocity is downward. VA = Submit Part B a A = O μA Submit Value Request Answer Determine the acceleration of the collar at this instant. Express your answer to three significant figures and include the appropriate units. Enter positive value if the acceleration is upward and negative value if the acceleration is downward. μA Value Ć Request Answer Units ? Units ?

Rotation of bar OA is controlled by the lead screw which imparts a horizontal velocity v to collar C and causes pin P to travel along the smooth slot. Determine the values of r and 6, where r = OP, if h = 160 mm, x = 120 mm, and v = 25 mm/s at the instant represented. h C

The mechanism for a car window winder is shown in the figure. Here the handle turns the small cog C, which rotates the spur gear S, thereby rotating the fixed-connected lever AB which raises track D in which the window rests. The window is free to slide on the track. If the handle is wound at 0.5 rad/s, determine the speed of points A and E and the speed of the window at the instant e = 30° D 20 mm 0.5 rad/s 50 mm -200 mm -200 mm O A=E=W=34.6 mm/s A=E=40 mm/s, W=34.6 mm/s O A=E=34.6 mm/s, W=40 mm/s O A=E=34.6 mm/s, W=34.6 mm/s