PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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Chapter 14, Problem 54P
To determine
The power supplied to the engine at the time
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A 1.28 Mg MINI accelerates at 6 m/s² starting from rest. If the drag resistance on the MINI due to the wind is FD = 10v N, where v is the speed in m/s, determine the power supplied to the motor when t = 5 s. The motor has a running efficiency of € = 0.68.
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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 sports car has a mass of 4000 Kg, and while it is traveling at 35 m/s the driver causes it to accelerate at 7 m/s². If the drag resistance on the car due to the wind is F, = (1.3v) N, where v is the velocity in m/s, determine the power supplied to the engine at this instant. The engine has a running efficiency of e= 0.60. F,arrow_forwardThe sports car has a mass of 2.0 Mg and accelerates at 6 m/s², starting from rest. (Figure 1) Part A If the drag resistance on the car due to the wind is Fn = (10v) N, where v is the velocity in m/s, determine the power supplied to the engine when t = 5 s. The engine has a running efficiency of e = 0.68. Express your answer to three significant figures and include the appropriate units. μΑ P = Value Units Submit Request Answer Provide Feedback Figure 1 of 1 >arrow_forwardOn its takeoff roll, the airplane starts from rest and accelerates according to a = ao - kv² where ao is the constant acceleration resulting from the engine thrust and -kv² is the acceleration due to aerodynamic drag. If að = 1.6 m/s², k = 0.000039 m ¹, and vis in meters per second, determine the design length of runway required for the airplane to reach the takeoff speed of 271 km/h if the drag term is (a) excluded and (b) included. V0 = 0 Answers: (a) Excluding drag, s= i (a) Including drag, S= i v=271 km/h m 3arrow_forward
- Given a 1400 kg car traveling along a route with an increasing vertical profile y=0.0003x^2. Determine the x-component of the car's velocity (m/s) and the total force (kN) if the constant velocity is 30 m/s and the distance is 210m. Hint: A line's slope is equal to tan theta, where theta is an angle measured from the x-axis.arrow_forwardOn its takeoff roll, the airplane starts from rest and accelerates according to a = ao - kv² where ao is the constant acceleration resulting from the engine thrust and -kv² is the acceleration due to aerodynamic drag. If ao = 1.8 m/s², k = 0.000064 m ¹, and vis in meters per second, determine the design length of runway required for the airplane to reach the takeoff speed of 206 km/h if the drag term is (a) excluded and (b) included. Vo = 0 Answers: (a) Excluding drag, s= i (a) Including drag. S= i v= 206 km/h m marrow_forwardIf the mass is initially at rest and the force is F = 3t2 Newton where t is in seconds, what is the velocity of the mass at t = 6 s? There is no friction. 54 m/s 216 m/s 9 m/s 162 m/s 4 kgarrow_forward
- The roller coaster car has a speed of VA = 36 ft/s when it is at the crest of a vertical parabolic track. The total weight of the car and the passengers is 350 lb. Neglect friction and the mass of the wheels. (Figure 1) Figure 200 ft AKKarrow_forwardThe sports car has a mass of 2.0 Mg and accelerates at 6 m/s², starting from rest. (Figure 1) Figure 1 of 1 FD Part A If the drag resistance on the car due to the wind is FD = (10v) N, where v is the velocity in m/s, determine the power supplied to the engine when t = 5 s. The engine has a running efficiency of € = 0.67. Express your answer to three significant figures and include the appropriate units. P = Submit ☐ O μA Value Provide Feedback Request Answer Units X ? Next >arrow_forwardA small projectile is fired vertically downward into a fluid medium with an initial velocity of 65 m/s. Due to drag resistance of the fluid, the projectile experiences a deceleration of a = (- 0.41v3) m/s2, where v is in m/s. Determine the projectile’s velocity and position 4 s after it is fired.arrow_forward
- A 7.8-Mg truck is resting on the deck of a barge which displaces 374 Mg and is at rest in still water. If the truck starts and drives toward the bow at a speed relative to the barge vrel = 5.6 km/h, calculate the speed v of the barge. The resistance to the motion of the barge through the water is negligible at low speeds. Vrel = 5.6 km/h 7.8 Mg %3D 374 Mg Answer: v = km/harrow_forwardThe 5kg block is placed on the 10kg block on a frictionless surface. While the 5kg block is tied to the wall with a rope, a 45N force is applied to the 10kg block to the right. Since the friction coefficient between the surfaces of the blocks is 0.2, find the tension on the rope and the acceleration of the 10kg block. (g = 10m / s ^ 2)arrow_forwardA7.1-Mg truck is resting on the deck of a barge which displaces 398 Mg and is at rest in still water. If the truck starts and drives toward the bow at a speed relative to the barge Vrel = 4.4 km/h, calculate the speed v of the barge. The resistance to the motion of the barge through the water is negligible at low speeds. F'ed = 4.4 km/h 7.1 Mg 398 Mg- Answer: v = i km/harrow_forward
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