*15-8.The automobile has a weight of 2700 Ib and is travelingforward at 4 ft/s when it crashes into the wall. If the impactoccurs in 0.06 s, determine the average impulsive force actingthe car. Assume the brakes are not applied. If thecoefficient of kinetic friction between the wheels and thepavement is p = 0.3, calculate the impulsive force on thewall if the brakes were applied during the crash.The brakesare applied to all four wheels so that all the wheels slip.

Given data: Mass of automobile, w = 2700 lb Final Velocity, v2 = 4 ft/s Coefficient of kinetic…

Answered: *15-8. The automobile has a weight of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The spring-held follower AB has a mass of 0.5 kg and moves back andforth as its end rolls on the contoured surface of the cam, where r = 0.15 m and z =(0.02 cos 2θ) m. If the cam is rotating at a constant rate of 30 rad/s, determine theforce component Fz at the end A of the follower when θ = 30°. The spring isuncompressed when θ = 90°. Neglect friction at the bearing C.
The trailer with its load has a mass of 200 kg and a center of mass at G. If it is subjected to a horizontal force of P = 1000 N, determine the trailer’s acceleration and the normal force on the pair of wheels at A and at B. The wheels are free to roll and have negligible mass.
14-29 The train car has a mass of 10 Mg and is traveling at 5 m/s when it reaches A. If the rolling resistance is 1/100 of the weight of the car, determine the compression of each spring when the car is momentarily brought to rest
The spring is placed between the wall and the 10-kg block. If the block is subjected to aforce of F = 500 N, determine its velocity when s = 0.5 m. When s = 0, the block is at restand the spring is uncompressed. The contact surface is smooth.
The collar has a mass of 2 kg and is attached to the light spring, which has a stiffness of 30 N∕m and an un- stretched length of 1.5 m. The collar is released from rest at A and slides up the smooth rod under the action of the con- stant 50-N force. Calculate the velocity v of the collar as it passes position B. Use point A as datum.
17-59 The uniform slender rod has a mass m. If it is released from rest when = 0, determine the magnitude of the reactive force exerted on it by pin B when = 90.
15-102. The two spheres each have a mass of 3 kg and are attached to the rod of negligible mass. Determine the time the torque M = (8t) N·m where, is in seconds, must be applied to the rod so that each sphere attains a speed of 3 m/s starting from rest
The 8-kg block is moving with an initial speed of 5 m/s. If the coefficient ofkinetic friction between the block and plane is uk = 0.25, determine the maximum compressionin the spring when the block momentarily stops.
The 10-lb block A travels to the right at va= 2 ft/sec at the instant shown. If the coefficient pf kinetuc friction is uk = 0.2 between the surface and A, determine the velocity of A when it has moved 4ft Block B has a weight of 20 lb. (Unit in m/sec)
The 4-kg box slides on the smooth surface and has a velocity of 15 m/s. If it strikes the smooth plate, which has a weight of 2 kg and is held in position by an unstretched spring of stiffness k = 600 N/m, determine the maximum compression imparted to the spring. Take e = 0.7 between the box and the plate.
The 18-lb object is travelling at a speed of 8 ft/s when the force of 15 lb is applied in thesame direction of its initial speed. What is the velocity of the block when it moves s =30ft. The coefficient of kinetic friction at the surface is μk = 0.26.
The box A has a mass of 80 kg, and the wedge B has a mass of 40 kg. Between all contacting surfaces, μs = 0.15 and μk = 0.12. What force F is required to raise A at a constant rate?

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