14.47 Four small disks A, B, C, and D can slide freely on a frictionless hori- - zontal surface. Disks B, C, and D are connected by light rods and are at rest in the position shown when disk B is struck squarely by disk A, which is moving to the right with a velocity vo = (38.5 ft/s)i. The weights of the disks are WA = WB = Wc = 15 lb, and WD = 30 lb. Knowing that the velocities of the disks immediately after the impact are VA = VB = VD (8.25 ft/s)i, vc = vci, and vp = vpi, determine (a) the speeds vc and vp, (b) the fraction of the initial kinetic energy of the system which is dissipated during the collision. the scatterin with are expre tment of Prob ected from A 14.26 0, 500) and the Chates VO A Fig. P14.47 D B 3 ft 3 ft X

14.47 Four small disks A, B, C, and D can slide freely on a frictionless hori- - zontal surface. Disks B, C, and D are connected by light rods and are at rest in the position shown when disk B is struck squarely by disk A, which is moving to the right with a velocity vo = (38.5 ft/s)i. The weights of the disks are WA = WB = Wc = 15 lb, and WD = 30 lb. Knowing that the velocities of the disks immediately after the impact are VA = VB = VD (8.25 ft/s)i, vc = vci, and vp = vpi, determine (a) the speeds vc and vp, (b) the fraction of the initial kinetic energy of the system which is dissipated during the collision. the scatterin with are expre tment of Prob ected from A 14.26 0, 500) and the Chates VO A Fig. P14.47 D B 3 ft 3 ft X

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.48P: Find the smallest distance d for which the hook will remain at rest when acted on by the force P....

See similar textbooks

Similar questions

Find the smallest distance d for which the hook will remain at rest when acted on by the force P. Neglect the weight of the hook, and assume that the vertical wall is frictionless.
Peturn to tnis part. NOTE: This is a multl-part question. Once an answer is submitted, you wII be unabie A 1-lb ball A and a 2-lb ball B are mounted on a horizontal rod which rotates freely about a vertical shaft. The balls are held in the positions shown by pins where ra = 10 in. The pin holding Bis suddenly removed and the ball moves to position C as the rod rotates. Neglect friction and the mass of the rod and know that the initial speed of A is VA = 8 ft/s. VB 16 in. 16 in. -8 in.- A В Determine the radial and transverse components of the acceleration of ball B immediately after the pin is removed. | ft/s?. ]f/s?. The radial component is The transverse component is
4. A garage door (8 ft by 10 ft) weighs 200-lbs is pulled with a constant 25-lb horizontal force to open it as shown. Assume the door rollers (A & B) are frictionless and the door does not rotate or lift off rollers A & B. G is the center of mass of the door. Determine: a. Reactions forces at each roller support (A & B) b. The constant acceleration of the door. c. The time for the door to move 10 feet. Assume it starts from rest. Draw FBD and write governing equations. Show all work. 8 ft 1 ft 5 ft 4 ft -8 ft 10 ft B 3 ft 25 lbs
Problem No. 1 A 14.0-kg Box is lowered vertically by a 16 mm diameter cable in which there is 163 N of tension at a given instant. What is the acceleration of the Box? Is it up or down?
A Center Raft A person is standing at one end of a uniform raft of length L that is floating motionless on water, as shown above. The center of mass of the person-raft system is a distance d'from the center of the raft. The person then walks to the other end of the raft. If friction between the raft and the water is negligible, how far does the raft nove relative to the water? L/2 B L C d/2 Ⓡ O d Center of Mass of System 2d in
A. A motorcycle and rider have a combined mass of 350kg. The wheels each have a mass of 20kg, diameter of 500mm and radius of gyration of 200mm. The rider accelerates uniformly from 5m/s to 25m/s over a distance of 100m, whilst climbing a hill of slope 1 in 20. The average resistance to motion, including drag, is 105 N. 1. Determine the total work done as the motorcycle ascends the incline. 2. Calculate the amount of power developed during the climb. B. At another point in its journey, the motorcycle and rider travel at 80 km/h around a left-hand bend of radius 30m. Calculate: 1. The angular velocity of each of the wheels. 2. The moment of inertia of each wheel. 3. The magnitude and effect of the gyroscopic torque produced on the bike.
2. A car and its load weighs 40 kN and the center of gravity is 600 mm from the ground and midway between the front and rear wheel which are 3 m apart. The car is brought to rest from a speed of 49 kph in 5 seconds by means of the brakes. Compute the normal force on each of the front wheels of the car. (Neglect friction)
11. Two bodies of weight 40 N and 20 N are connected to the two ends of a light inextensible string, passing over a smooth pulley. The weight of 40 N is placed on a horizontal surface while the weight of 20 N is hanging free in the air as shown in Fig.1 The horizontal surface is rough one, having coefficient of friction for 40 N block as 0.28, determine i) acceleration of the system ii) Tension in the string. 40 N smooth pulley 20 N
4) Block B weighing 500 N rests on block A which weighs 300 N. The dynamic coefficient of friction be- tween contact surfaces is 0.4. At wall C there are rollers whose friction we can neglect. What is the ac- celeration of body A when a force F of 5000 N is ap- plied? F De gem B A 20°
For a technology project, a student has built a vehicle, of total mass 6.00 kg, that moves itself. As shown, it runs on four light wheels. A reel is attached to one of the axles, and a cord originally wound on the reel goes up over a pulley attached to the vehicle to support an elevated load. After the vehicle is released from rest, the load descends very slowly, unwinding the cord to turn the axle and make the vehicle move forward (to the left as shown). Friction is negligible in the pulley and axle bearings. The wheels do not slip on the floor. The reel has been constructed with a conical shape so that the load descends at a constant low speed while the vehicle moves horizontally across the floor with constant acceleration, reaching a final velocity of 3.00î m/s. (a) Does the floor impart impulse to the vehicle? If so, how much? (b) Does the floor do work on the vehicle? If so, how much? (c) Does it make sense to say that the final momentum of the vehicle came from the floor? If…
1. A cart is being pulled by a motor. The cart has a mass of m = 200 kg. The motor applies a horizontal force of F = 800 N to the center of the right side of the cart. The cart is 1m tall, the total length is 1.5m, the wheels are 1m apart from each other, and the center of mass G is 0.4 m above the floor and on the horizontal center. Ignore friction. If there is no rotational movement of the cart, determine the following: 1. The cart's acceleration 2. The reaction (normal) force at the front pair of wheels. 3. The reaction (normal) force at the rear pair of wheels. F 77 TI T
a) What is the function of a governor ? How does it differ from that of a flywheel? b) Each arm of a Porter governor is 200 mm long and is hinged at a distance of 40 mm from the axis of rotation. The mass of each ball is 1.5 kg and of the sleeve 25 kg. When the links are at 30° to the vertical, the sleeve begins to rise at 260 rpm. Asuming that the friction force is