*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,

Answered: Image /qna-images/answer/1c59c34c-0616-4b36-b8d5-26b6c5761865.jpg

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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Answer: sA = 19.973 m
Determine the time required by a diesel-electric locomotive, which produces a constant drawbar pull of 122400 Ib, to increase the speed of a 1960-ton freight train from 16 mi/hr to 27 mi/hr up a 2.4-percent grade. Train resistance is 9.5 Ib per ton. Answer:t= i min
A car with passengers has a mass of 1200 kg and a frontal area of 1.8 m. It is traveling up a gradient of 1 in 25 at a speed of75 km/h. The rolling resistance of the car is given by R, = (0.0112 + 0.00006 V) Mg and the air resistance coefficient is 0.02688. The engine develops 50 kW corresponding to an engine speed of 4500 rpm. The rear axle ratio is 5:1 and the transmission efficiency is 96%. If the wheel radius is 340 mm, determine the 1. tractive resistance 2. tractive effort available at the wheels and 3. acceleration while moving up the gradient
A projectile (m, = 77 g) traveling at v = 585 m/s strikes and becomes embedded in the block (m, = 33 kg), which is initially stationary. Compute the energy lost during the impact. Express your answer as an absolute value JAE| and as a percentage n of the original system energy E. Answers: JAE| = J n = %
The coefficient of kinetic friction between the60-kg crate and the ground is uf = 0.3. The crate starts from rest, and P = 225 N .(Figure 1) Part A Determine the velocity of the crate when t = 4s Express your answer to three significant figures and include the appropriate units. HẢ v = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining • Part B Determine the distance the crate travels when 4 s Express your answer to three significant figures and include the appropriate units. Figure HÀ S = Value Units Submit Request Answer 30° Provide Feedback
Starting from rest, the cable can be wound onto the drum of the motor at a rate of VA (3t2) m/s, where tis in seconds. Part A Determine the time needed to lift the load 6 Imn. Express your answer to three significant figures and include the appropriate units. t=
A bullet B of mass mB traveling with a speed v0= 1200 m/s ricochets off a fixed steel plate A of mass mA. Let mA >> mBso that it can be assumed that mB/mA→0. If the incidence angle of the bullet is θ= 15◦ and the COR of the impact is e= 0.5, determine the rebound angle φ, as well as the bullet’s rebound speed. Use conservation lawmethods to solve the problem.
A particle of mass 2.0 kg moves along the x axis through a region in which its potential energy U(x) varies as shown in Fig. 12-25. When the particle is at x = 2.0 m, its velocity is -1.5 m/s. 5 Ⓒ positive x O negative x N Direction 0 (b) Between what limits does the motion take place? 5.5 X m (lower limit) 5.5 Xm (upper limit) (c) How fast is it moving when it is at x = 7.0 m? m/s -5 5-10 -15 Figure 12-25 (a) Calculate the magnitude and direction of the force acting on the particle at this position. Magnitude -20 x (m) 5 10 V 0 15
A projectile (m, = 64 g) traveling at v = 680 m/s strikes and becomes embedded in the block (m, = 47 kg), which is initially stationary. Compute the energy lost during the impact. Express your answer as an absolute value |AE| and as a percentage n of the original system energy E. Answers: ΙΔΕΙ- i n = i
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Question 9– answer all parts A heavy goods vehicle of total mass 4.8 tonnes descends a hill with a gradient of 8 degrees from the horizontal. During this motion, the vehicle experiences a rolling resistance to its motion of 880 N. Whilst travelling at a velocity of 72 km/h, its brakes are applied, and the truck is brought uniformly to rest in a distance of 140 m. During this period of constant deceleration, it may be assumed that the rolling resistance remains constant at 88ON, this being in addition to the retarding force applied by the brakes. Calculate for the vehicle whilst it is slowing down: a) The vertical height through which it descends. b) Its decrease in potential energy. c) Its initial velocity in m/s. Its decrease in kinetic energy. -------------------- ---------------- -------------- ---------

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