PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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Chapter 14, Problem 44P
An automobile having a mass of 2 Mg travels up a 7° slope at a constant speed of v = 100 km/h. If
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An automobile having a mass of 2000 kg travels up a 7 degree slope at a constant speed of v = 100 km/h. If mechanical friction and wind resistance are neglected, determine the power developed by the engine if the automobile has an efficiency ε = 0.65.
Solve it correctly please. I
A train has a mass of 455 tonne is going up an incline of 1 in 168. The tractive resistance of the train is 47.3 N/tonne. If the train accelerate uniformly from 23 km/h to 53 km/h in 1 minutes, calculate the total force applied by the engine.
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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- A 3140-lb car travels up the 4-percent incline shown. The car is subjected to a 70-lb aerodynamic drag force and a 51-lb force due to all other factors such as rolling resistance. Determine the power output required at a speed of 66 mi/hr if (a) the speed is constant and (b) the speed is increasing at the rate of 0.06g. Answers: (a) Constant speed: 100 v=66 mi/hr P= (b) Increase in speed is 0.06g: P = hp hparrow_forwardAn automobile having a mass of 2000 kg travels up a 7 degree slope at a constant speed of v = 100 km/h. If mechanical friction and wind resistance are neglected, determine the power developed by the engine if the automobile has an efficiency ε = 0.65arrow_forwardA 20 ton railway wagon is coupled to three stationary railway wagons of the same type with v = 3 m/s. At what speed do the wagons move if friction can be neglected?arrow_forward
- e= 45 3 m 5 m A 60-kg man sprints towards a river, attempting to grasp a 3-m rope connected to a tree. Before grabbing the rope, he sprints at a speed of 5 m/s with a uniform acceleration of 3 m/s² and a distance of 5 m. During his run, he encounters a horizontal air resistance of 10 N. Then, using the 3-m rope, he swings across the river at a constant speed before letting go of the rope. Determine the following: (a) the time he spent running before reaching the rope and the velocity of the man upon grabbing the rope, (b) traction force during running, and the tension in the rope just before letting it go.arrow_forwardA block with a weight of 5 kg hanging from the ceiling attached to a spring is raised and then pulled downward. As it passes downward through the spring's unstretched position it has a speed of 10 m/s downward. If the spring has a stiffness of 5 N/m, determine the maximum position below the spring's unstretched position achieved by the block.arrow_forwardThe 3.0 Mg jeep increases its speed uniformly from 18 km/hr to 72 km/hr in 10 s up a 30° inclined road. The average power input that must be supplied by the engine which operates for an efficiency n = 0.75 is:arrow_forward
- A heavy truck is running up the track at an incline of 1 in 15 (sine) at a constant speed of 50 km/h. The total working power is 65 kW during this working condition. Calculate the power required to overcome the friction of force or the road resistance if knowing the mass of the truck is 10 tonnes?arrow_forwardCompute the power input of the motor, which operates at an efficiency E = 0.8arrow_forwardA constant tractive effort of 10 N is applied for 0.5 Hr, and total energy of 1 kWhr is consumed in doing so. Find the average velocity of the vehicle during this period.arrow_forward
- The diesel engine of a 400-Mg train increases the train's speed uniformly from rest to 10 m/s in 100 s along a horizontal track. Determine the average power developed.arrow_forwardDynamicsarrow_forwardA 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_forward
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