11.37 A small package is released from rest at A and moves along the skate wheel conveyor ABCD. The package has a uniform acceleration of 4.8 m/s²2 as it moves down sections AB and CD, and its velocity is con- stant between B and C. If the velocity of the package at D is 7.2 m/s, determine (a) the distance d between C and D, (b) the time required for the package to reach D. O A 3 m Fig. P11.37 B -3 m с ol D

8. The motor draws in the cable with an acceleration of 3 m/s2. The beam has a uniform mass of 20 kg/m , and the crate has a mass of 250 kg . Neglect the mass of the motor and pulleys.

8. The car is traveling at 30 mi/h when the traffic light 295 ft ahead turns yellow. The driver takes 1 s to react before he applies the accelerator. If the car has a constant acceleration of 5 ft/s² and the light remains yellow for 5 s, will the car reach the light before it turns red? How fast is the car moving when it reaches the light? Ans. No. 66.7 ft/s

Under the action of force P, the constant acceleration of block B is 6.2 ft/sec² up the incline. For the instant when the velocity of B is 3.1 ft/sec up the incline, determine the velocity of B relative to A (positive if up the slope, negative if down), the acceleration of B relative to A (positive if up the slope, negative if down), and the absolute velocity of point C (positive if up the slope, negative if down) of the cable. B 25° Answers: VB/A = AB/A = Vc = i i ft/sec ft/sec² ft/sec