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.
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,
The 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.
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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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- On 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_forwardGiven 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_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
- On 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_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
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