Problem 12.1CQ: A 1000-lb boulder B is resting on a 200-lb platform A when truck C accelerates to the left with a... Problem 12.2CQ: Marble A is placed in a hollow tube, and the tube is swung in a horizontal plane causing the marble... Problem 12.3CQ: The two systems shown start from rest. On the left, two 40-lb weights are connected by an... Problem 12.4CQ: Blocks A and B are released from rest in the position shown. Neglecting friction, the normal force... Problem 12.5CQ: People sit on a Ferris wheel at points A, B, C, and D. The Ferris wheel travels at a constant... Problem 12.1FBP: Crate A is gently placed with zero initial velocity onto a moving conveyor belt. The coefficient of... Problem 12.2FBP: Two blocks weighing WA and WB are at rest on a conveyor that is initially at rest. The belt is... Problem 12.3FBP: Objects A, B, and C have masses mA, mB, and mC, respectively. The coefficient of kinetic friction... Problem 12.4FBP Problem 12.5FBP: Blocks A and B have masses mA and mB, respectively. Neglecting friction between all surfaces, draw... Problem 12.6FBP: A pilot of mass m flies a jet in a half-vertical loop of radius R so that the speed of the jet, v,... Problem 12.7FBP: Wires AC and BC are attached to a sphere that revolves at a constant speed v in the horizontal... Problem 12.8FBP: A collar of mass m is attached to a spring and slides without friction along a circular rod in a... Problem 12.9FBP Problem 12.10FBP: At the instant shown, the length of the boom AB is being decreased at the constant rate of 0.2 m/s,... Problem 12.11FBP: Disk A rotates in a horizontal plane about a vertical axis at the constant rate 0. Slider B has a... Problem 12.12FBP: Pin B has a mass m and slides along the slot in the rotating arm OC and along the slot DE which is... Problem 12.1P Problem 12.2P Problem 12.3P Problem 12.4P Problem 12.5P Problem 12.6P Problem 12.7P: A tugboat pulls a small barge through a harbor. The propeller thrust minus the drag produces a net... Problem 12.8P Problem 12.9P: 12.9 If an automobile’s braking distance from 90 km/h is 45 m on level pavement, determine the... Problem 12.10P Problem 12.11P: The coefficients of friction between the load and the flatbed trailer shown are s = 0.40 and k =... Problem 12.12P: A light train made up of two cars is traveling at 90 km/h when the brakes are applied to both cars.... Problem 12.13P Problem 12.14P Problem 12.15P Problem 12.16P Problem 12.17P: A 5000-lb truck is being used to lift a 1000-lb boulder B that is on a 200-lb pallet A. Knowing the... Problem 12.18P: Block A has a mass of 40 kg, and block B has a mass of 8 kg. The coefficients of friction between... Problem 12.19P: Block A has a mass of 40 kg, and block B has a mass of 8 kg. The coefficients of friction between... Problem 12.20P: The flat-bed trailer carries two 1500-kg beams with the upper beam secured by a cable. The... Problem 12.21P: 12.21 A baggage conveyor is used to unload luggage from an airplane. The 10-kg duffel bag A is... Problem 12.22P: To unload a bound stack of plywood from a truck, the driver first tilts the bed of the truck and... Problem 12.23P: To transport a series of bundles of shingles A to a roof, a contractor uses a motor-driven lift... Problem 12.24P: An airplane has a mass of 25 Mg and its engines develop a total thrust of 40 kN during take-off. If... Problem 12.25P Problem 12.26P: A constant force P is applied to a piston and rod of total mass m to make them move in a cylinder... Problem 12.27P: A spring AB of constant k is attached to a support at A and to a collar of mass m. The unstretched... Problem 12.28P: Block A has a mass of 10 kg, and blocks B and C have masses of 5 kg each. Knowing that the blocks... Problem 12.29P Problem 12.30P Problem 12.31P: A 10-lb block B rests as shown on a 20-lb bracket A. The coefficients of friction are s = 0.30 and k... Problem 12.32P: Knowing that k = 0.30, determine the acceleration of each block when mA = mB = mC. Fig. P12.32 and... Problem 12.33P: Knowing that k = 0.30, determine the acceleration of each block when mA = 5 kg, mB = 30 kg, and mC =... Problem 12.34P Problem 12.35P: Block B of mass 10 kg rests as shown on the upper surface of a 22-kg wedge A. Knowing that the... Problem 12.36P Problem 12.37P Problem 12.38P: Human centrifuges are often used to simulate different acceleration levels for pilots. When... Problem 12.39P: A single wire ACB passes through a ring at C attached to a sphere which revolves at a constant speed... Problem 12.41P Problem 12.42P Problem 12.43P Problem 12.44P Problem 12.45P: During a high-speed chase, a 2400-lb sports car traveling at a speed of 100 mi/h just loses contact... Problem 12.46P: An airline pilot climbs to a new flight level along the path shown. Knowing that the speed of the... Problem 12.47P: The roller-coaster track shown is contained in a vertical plane. The portion of track between A and... Problem 12.48P: A spherical-cap governor is fixed to a vertical shaft that rotates with angular velocity . When the... Problem 12.49P: A series of small packages, each with a mass of 0.5 kg, are discharged from a conveyor belt as... Problem 12.50P: 12.50 A 54-kg pilot flies a jet trainer in a half-vertical loop of 1200-m radius so that the speed... Problem 12.51P Problem 12.52P: A curve in a speed track has a radius of 1000 ft and a rated speed of 120 mi/h. (See Sample Prob.... Problem 12.53P: Tilting trains, such as the Acela Express that serves the Northeast Corridor in the Northeast United... Problem 12.54P Problem 12.55P: A 3-kg block is at rest relative to a parabolic dish which rotates at a constant rate about a... Problem 12.56P Problem 12.57P: A turntable A is built into a stage for use in a theatrical production. It is observed during a... Problem 12.58P: The carnival ride from Prob. 12.51 is modified so that the 80-kg riders can move up and down the... Problem 12.59P Problem 12.60P Problem 12.61P: A small block B fits inside a slot cut in arm OA that rotates in a vertical plane at a constant... Problem 12.62P: The parallel-link mechanism ABCD is used to transport a component I between manufacturing processes... Problem 12.63P Problem 12.64P: A small 250-g collar C can slide on a semicircular rod which is made to rotate about the vertical AB... Problem 12.65P: A small 250-g collar C can slide on a semicircular rod which is made to rotate about the vertical AB... Problem 12.67P: An advanced spatial disorientation trainer is programmed to only rotate and translate in the... Problem 12.68P: The 3-kg collar B slides on the frictionless arm AA. The arm is attached to drum D and rotates about... Problem 12.69P: A 0.5-kg block B slides without friction inside a slot cut in arm OA that rotates in a vertical... Problem 12.70P: Pin B weighs 4 oz and is free to slide in a horizontal plane along the rotating arm OC and along the... Problem 12.71P Problem 12.72P format_list_bulleted