Chapter 15, Problem 109P

3/50 The 4-oz slider has a speed v = 3 ft/sec as it passes point A of the smooth guide, which lies in a horizontal plane. Determine the magnitude R of the force which the guide exerts on the slider (a) just before it passes point A of the guide and (b) as it passes point B. 8" B A Problem 3/50

3/167 The baseball is traveling with a horizontal velocity of 85 mi/hr just before impact with the bat. Just after the im- pact, the velocity of the 5-oz ball is 130 mi/hr directed at 35° to the horizontal as shown. Determine the x- and y- components of the average force R exerted by the bat on the baseball during the 0.005-sec impact. Comment on the treat- ment of the weight of the baseball (a) during the impact and (b) over the first few seconds after impact. 130 mi/hr 35° 85 mi/hr

The van is traveling at 20 km/h when the coupling of the trailer at A fails. If the trailer has a mass of 300 kg and coasts 50 m before coming to rest, determine the constant horizontal force F created by rolling friction which causes the trailer to stop.

The uniform bar AB has length L = 4.5 ft and weight WAB= 19 lb. At the instant shown, 8 = 67° and vä = 5.8 ft/s. Determine the magnitude of the linear momentum of AB, as well as the angular momentum of AB about its mass center G at the instant shown. lb.s. The magnitude of the linear momentum of AB is The angular momentum of AB about its mass center G at the instant shown is ( ft·lb.s) k.

The small collr of mass m = 0.59 kg is eleased from rest at A and slides down the curved rod in the vertical plane with negligible friciton. Find the velocity of the collar as it strikes the base at B.

At the instant shown, link CD rotates with an angular velocity of W = 8.5 rad/s. If it is subjected to a couple moment M = 340 N·m, determine the magnitude of reaction force developed in link AB. The block has a mass of 50 kg and center of mass at G. Neglect the mass of links AB and CD. (Hint, since the mass of link AB or CD is negligible, the external force or moment acting on it sums up to 0.) Please pay attention: the numbers may change since they are randomized. Your answer must include 1 place after the decimal point, and proper unit. Take g = 9.81 m/s². 0.1 m 0.4 m 0.4 m G Your Answer: Answer B 0.6 m units A M

The small car, which has a mass of 21.7 kg, rolls freely on the horizontal track and carries the 4.4-kg sphere mounted on the light rotating rod with r = 0.56 m. A geared motor drive maintains a constant angular speed 0 = 2.8 rad/s of the rod. If the car has a velocity v = 0.45 m/s when 0 = 0, calculate v when = 53°. Neglect the mass of the wheels and any friction. Answer: When 8 = 53°, v = i m/s

3. The smooth 160-lb pipe has a length of 20 ft and a negligible diameter. It is carried on a truck as shown. Determine the maximum acceleration which the truck can have without causing the normal reaction at A to be zero (i.e. lifting the pipe). Also determine the horizontal and vertical components of force which the truck exerts on the pipe at B at that acceleration. 20 ft 5 ft B 12 ft

The 1400 kg car is starting from rest with a constant acceleration, and after 20 s reaches a speed of 40 km/h. The front wheels are free to roll. Neglect the mass of the wheels and calculate: 1. The normal reactions at each of the four wheels on the road 2. The friction force under the rear driving wheels B.