*14-20. The crash cushion for a highway barrier consistsof a nest of barrels filled with an impact-absorbing material.The barrier stopping force is measured versus the vehiclepenetration into the barrier. Determine the distance a carhaving a weight of 4000 lb will penetrate the barrier if it isoriginally traveling at 55 ft/s when it strikes the first barrel.36271810152025Vehicle penetration (ft)Barrier stopping force (kip)9,

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Answered: *14-20. The crash cushion for a highway…

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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Ima Rilla Saari rushes to her car in order to hurry and get dressed for work. Failing to realize the dangers of driving under slick and icy condition. She collides her 940-kg mazda miata into the rear of a 2460-kg pick up truck which was at rest at the light on the Lake Avenue. Ima's pre collision speed was 12.5 m/s. Determine the pre collision speed of the two entangled cars as they alide accross the ice
the vertical ground reaction force from a force plate during the contact phase for a 55 kg runner. If the initial vertical velocity of the runner when she first makes contact with the plate is directed 0.40 m/s downwards, determine the following:a) the vertical velocity (including direction andmagnitude) just as the runner comes off the plate at the end of ground contact. (Average net force includes the effect of gravity and thevertical ground reaction force acting on therunner) b) the average vertical ground reaction forceduring the ground contact phase of the run
The 30-g bullet is fired horizontally at 1000 m/s into the 300-g block resting on a smooth surface. If the bullet becomes embedded in the block, what is the velocity of the block immediately after impact ?.
15-42. A toboggan having a mass of 10 kg starts from rest at A and carries a girl and boy having a mass of 40 kg and 45 kg, respectively. When the toboggan reaches the bottom of the slope at B, the boy is pushed off from the back with a horizontal velocity of Vb/t = 2 m/s, measured relative to the toboggan. Determine the velocity of the toboggan afterwards. Neglect friction in the calculation
The 4-kg collar C has a velocity of ?? = 2?/? when it is at A. If the guide rod is smooth, draw a free body diagram and determine the speed of the collar when it is at B. The spring has an unstretched length of ?o =0.2?
The cannon and support without a projectilehave a mass of 250 kg. If a 20-kg projectile is fired from thecannon with a velocity of 400 m>s, measured relative to thecannon, determine the speed of the projectile as it leavesthe barrel of the cannon. Neglect rolling resistance.Show the Free Body Diagram
A warship displaces 250 tonnes and its resistance to motion through the water may be taken at 50N per Tonne. If the ship its stationery and four 5.5 kg shells are fired horizontally and simultaneously in the same direction at 95 m/s , Dertermine the velocity of the recoil and how far will the ship move?
What allows us to make the determination that the boxes arent moving at the same velocity after being released from rest? It seems to me we would base this off of each boxes resistance to friction, but in this problem they are moving on a smooth surface. And then in this problem, we consider the boxes to move at the same velocities after the spring is released? Please explain how we can make this judgement. This is the problem: The two blocks A and B each have a mass of 5 kg and are suspended from parallel cords. A spring, having a stiffness of k=60 N/m is attached to B and is compressed 0.3 m against A and B as shown. Determine the maximum angles θ\thetaθ and ϕ\phiϕ of the cords when the blocks are releasedfrom rest and the spring becomes unstretched.
The two disks AA and BB have a mass of 4 kgkg and 6 kgkg , respectively. They collide with the initial velocities shown. The coefficient of restitution is eee = 0.75. Suppose that (vA)1(vA)1va = 6 m/sm/s , (vB)1(vB)1vb = 8 m/sm/s Determine the magnitude of the velocity of BB just after impact. Determine the angle between the xx axis and the velocity of BB just after impact, measured clockwise from the positive xx axis.
Q1/ Two balls of masses m; = 0.5 kg and my = 1.5 kg are sliding toward each other on a straight frictionless track. If they experience a head-on elastic collision and if the initial velocities of m; and m; are 0.6 m/s to the right and 3 m/s to the left, respectively, find the final velocities of two balls?
A vehicle of mass 65 tonnes is moving at 85kmph. It collides with a second vehicle of mass 30 tonnes moving in the opposite direction at 40 kmph. After the collision the second vehicle has changed its speed to 2100 cm/s in the opposite direction as before the collision. Find: (i) the velocity of the first vehicle after the collision (ii) the coefficient of restitution.
An 1800-kg pile driver is used to drive a steel beam into the ground. The pile driver falls 4.00 m before coming into contact with the top of the beam, and it drives the beam 9.0 cm farther into the ground as it comes to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest. ________ n A 66.0 kg base runner begins his slide into second base when he is moving at a speed of 3.9 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to friction acting on the runner? ________ J (b) How far does he slide? ________ m

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