PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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Chapter 14, Problem 6RP
To determine
The power supplied to the motor when
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Chapter 14 Solutions
PEARSON ETEXT ENGINEERING MECH & STATS
Ch. 14 - Prob. 1FPCh. 14 - If the motor exerts a constant force of 300 N on...Ch. 14 - If the motor exerts a force of F = (600 + 2s2) N...Ch. 14 - The 1.8-Mg dragster is traveling at 125 m/s when...Ch. 14 - When s = 0.5 m, the spring is unstretched and the...Ch. 14 - The 5-lb collar is pulled by a cord that passes...Ch. 14 - Prob. 2PCh. 14 - The 100-kg crate is subjected to the forces shown....Ch. 14 - Determine the required height h of the roller...Ch. 14 - When the driver applies the brakes of a light...
Ch. 14 - Prob. 7PCh. 14 - The force F, acting in a constant direction on the...Ch. 14 - The 2-lb brick slides down a smooth roof, such...Ch. 14 - The two blocks A and B have weights WA = 60 lb and...Ch. 14 - A small box of mass m is given a speed of v=14gr...Ch. 14 - Prob. 18PCh. 14 - If the cord is subjected to a constant force of F=...Ch. 14 - The crash cushion for a highway barrier consists...Ch. 14 - The 25-lb block has an initial speed of v0 = 10...Ch. 14 - At a given instant the 10-lb block A is moving...Ch. 14 - Prob. 25PCh. 14 - The catapulting mechanism is used to propel the...Ch. 14 - Prob. 27PCh. 14 - Prob. 31PCh. 14 - When the 150-lb skier is at point A he has a speed...Ch. 14 - Prob. 39PCh. 14 - Prob. 40PCh. 14 - If the contact surface between the 20-kg block and...Ch. 14 - Prob. 8FPCh. 14 - Prob. 9FPCh. 14 - Prob. 10FPCh. 14 - Prob. 11FPCh. 14 - Prob. 12FPCh. 14 - The jeep has a weight of 2500 lb and an engine...Ch. 14 - Determine the power Input for a motor necessary to...Ch. 14 - An automobile having a mass of 2 Mg travels up a 7...Ch. 14 - Prob. 45PCh. 14 - To dramatize the loss of energy in an automobile,...Ch. 14 - Escalator steps move with a constant speed of 0.6...Ch. 14 - Prob. 48PCh. 14 - The 1000-lb elevator is hoisted by the pulley...Ch. 14 - The sports car has a mass of 2.3 Mg, and while it...Ch. 14 - Prob. 54PCh. 14 - Prob. 55PCh. 14 - The 50-lb block rests on the rough surface for...Ch. 14 - The 2-kg pendulum bob is released from rest when...Ch. 14 - Prob. 14FPCh. 14 - Prob. 15FPCh. 14 - Prob. 16FPCh. 14 - The 75-lb block is released from rest 5 ft above...Ch. 14 - Prob. 18FPCh. 14 - The girl has a mass of 40 kg and center of mass at...Ch. 14 - The 30-lb block A is placed on top of two nested...Ch. 14 - The 5-kg collar has a velocity of 5 m/s to the...Ch. 14 - The 5-kg collar has a velocity of 5 m/s to the...Ch. 14 - Prob. 71PCh. 14 - The roller coaster car has a mass of 700 kg,...Ch. 14 - The roller coaster car has a mass of 700 kg,...Ch. 14 - Prob. 76PCh. 14 - The roller coaster car having a mass m is released...Ch. 14 - The spring has a stiffness k = 200 N/m and an...Ch. 14 - Prob. 79PCh. 14 - Prob. 80PCh. 14 - When s = 0, the spring on the firing mechanism is...Ch. 14 - If the mass of the earth is Me, show that the...Ch. 14 - A rocket of mass m is fired vertically from the...Ch. 14 - The 4-kg smooth collar has a speed of 3 m/s when...Ch. 14 - Prob. 85PCh. 14 - Prob. 87PCh. 14 - Prob. 90PCh. 14 - The roller coaster car has a speed of 15 ft/s when...Ch. 14 - Prob. 1RPCh. 14 - The small 2-lb collar starting from rest at A...Ch. 14 - Prob. 3RPCh. 14 - Prob. 4RPCh. 14 - Prob. 5RPCh. 14 - Prob. 6RPCh. 14 - Prob. 7RPCh. 14 - Prob. 8RP
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- The 300-kg bar B, originally at rest, is being towed over a series of small rollers. Determine the force in the cable when t = 5s, if the motor M is drawing in the cable for a short time at a rate of v = (0.47²) m/s, where t is in seconds (0 <= t<= 6 s). How far does the bar move in 5s? Neglect the mass of the cable, pulley, and the rollers. M Barrow_forwardThe man pushes the 20 lbm crate with a force of F = 150 lbf and with an angle of 45 deg fromhorizontal. Determine the power (hp) supplied by the man when t = 4 seconds. The coefficient of kineticfriction between the floor and the crate is u k= 0.2. Initially the create is at rest.arrow_forwardCompute the power input of the motor, which operates at an efficiency E = 0.8arrow_forward
- A block initially at rest at the top slides down along the smooth cylindrical surface. If the attached spring has a stiffness k = 2 lb/ft, determine its unstretched length so that it does not allow the 6 lb block to leave the surface until 8 = 60° www 2 ft www/www. N k = 2 lb/ftarrow_forwardThe crate B and cylinder A have a mass of 213 kg and 75 kg, respectively. If the system is released from rest, find the tension in the cable when t = 3 s. Neglect the mass of the pulleys. Give your answer in Newtons (N). Barrow_forwardThe 925-kg motorized unit A is designed to raise and lower the 615-kg bucket B of concrete. Determine the average force R which supports unit A during the 5.9 seconds required to slow the descent of the bucket from 4.6 m/s to 0.9 m/s. Analyze the entire system as a unit without finding the tension in the cable. Answer: R = i kNarrow_forward
- A spring having original length of L1 is constricted by the 4 cords having length of L2. So, those cords keep spring compressed when there is nothing on the platform. Box having mass of m is placed on the platform, at the same time pushing platform further down by L3 meters. Afterwards, the platform is released from rest. Determine the height h the box rises in the air. Stiffness of spring is K=150 N/m. neglect the mass of the platform and the cords.arrow_forward-y = 45 - hft k lblft www Ift The 5-lb collar has a speed of 3 ft.s1 at A. The attached spring has an unstretched length of 2- ft and a stiffness of k=17lb.ft1. If the collar moves over the smooth rod, determine its speed when it reaches point B. The height of A is h=9-ft and B is at l=4-ft from the vertical of Aarrow_forwardF14-11. If the 50-kg load A is hoisted by motor M so that the load has a constant velocity of 1.5 m/s, determine the power input to the motor, which operates at an efficiency e = 0.8. 1.5 m/sarrow_forward
- The 56.28 kg crate is hoisted up the 0 = 27° incline by the pulley system and motor M. If the crate starts from rest and, by constant acceleration, attains a speed of 8.17 m/s after traveling 7.84 m along the plane, determine the supplied power to the motor if the crate has moved 8 m and the coefficient of kinetic friction between the plane and the crate is Hk = 0.3. Neglect friction along the plane. The motor has an efficiency of 0.691. Marrow_forwardA pilot weighs 150 lb and is traveling at a constant speed of 120 ft/s. Determine the normal force he exerts on the seat of the plane when he is upside down at A. The loop has a radius of curvature of 400 ft. IA 400 ftarrow_forwardThe 845-kg motorized unit A is designed to raise and lower the 480-kg bucket B of concrete. Determine the average force R which supports unit A during the 4.5 seconds required to slow the descent of the bucket from 4.1 m/s to 0.6 m/s. Analyze the entire system as a unit without finding the tension in the cable. A B Answer: R = i kNarrow_forward
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