HW 11Steep safety ramps are built beside mountain highways to enable vehi-cles with defective brakes to stop. A 10-ton truck enters a 15° rampat a high speed vo 108 ft/s and travels for 6 s before its speed isreduced to 36 ft/s. Assuming constant deceleration, determine (a) themagnitude of the braking force, (b) the additional time required forthe truck to stop. Neglect air resistance and rolling resistance.%3DRAIL INES0015°

Answered: Image /qna-images/answer/ca45b9a2-22b9-45f2-bb91-76fd91f3a4c4.jpg

Answered: Steep safety ramps are built beside…

Similar questions

You testify as an expert witness in a case involving an accidentin which car A slid into the rear of car B, which was stopped ata red light along a road headed down a hill. You findthat the slope of the hill is u = 12.0, that the cars were separatedby distance d =24.0 m when the driver of car A put the car into aslide (it lacked any automatic anti-brake-lock system), and that thespeed of car A at the onset of braking was v0 =18.0 m/s.With whatspeed did car A hit car B if the coefficient of kinetic friction was(a) 0.60 (dry road surface) and (b) 0.10 (road surface covered withwet leaves)?
A body in 1D motion is moving left at speed 2.4 m/s at one moment, and 9 seconds later is moving right at 4.2 m/s.Find the average acceleration ax of the body if left in the +x direction.
To study damage to aircraft that collide with largebirds, you design a test gun that will accelerate chicken-sized objectsso that their displacement along the gun barrel is given byx = (9.0 * 103 m/s2)t2 - (8.0 * 104 m>s3)t3. The object leavesthe end of the barrel at t = 0.025 s. (a) How long must the gun barrelbe? (b) What will be the speed of the objects as they leave the end ofthe barrel? (c) What net force must be exerted on a 1.50 kg object at(i) t = 0 and (ii) t = 0.025 s?
The speed of body is constant. Can it accelerate?
It’s commonly understood that “It’s not the fall that kills you, it’s the sudden stop at the end.” Afew summers ago I was roofing my house – the peak of which is roughly 18 feet above theground. Let’s say I got so caught up in the joy of shingling, I carelessly stepped off the roof,falling to the pavement. Striking the ground, if my head came to rest over a distance of 8 mm(that distance would be the compression of my skull, BTW),a. What (large!) deceleration would I be experiencing (in m/s2)?b. Over what time interval would that deceleration take place?
A woodpecker’s brain is specially protected from large decelerations by tendon-like attachments inside the skull. While pecking on a tree, the woodpecker’s head comes to a stop from an initial velocity of 0.600 m/s in a distance of only 2.00 mm. (a) Find the acceleration in m/s^2 and in multiples of g (g=9.80m/s^2). (b) Calculate the stopping time.
A man steps outside one winter day to go to work. His icydriveway is 8.0 m long from top to mailbox, and it slopes downwardat 20° from the horizontal. He sets his briefcase on theice at the top while opening the garage, and the briefcase slidesdown the driveway. Ignore friction. (a) What is its acceleration?(b) How many seconds does it take to get halfway to the mailbox?(c) How many seconds does it take to reach the mailbox?(d) What is its speed at the instant it reaches the mailbox?
A ball is tossed up with some initial velocity. Which of the following statements about ball’s acceleration along its path are true? Assume no air drag. Consider up as the positive direction. At the point half way up to the maximum height (hmax/2) while going up the ball exhibits acceleration of -10 m/s/s. At the original height when falling back the ball exhibits acceleration of -10m/s/s. At the point half way up to the maximum height (hmax/2) while going down the ball has negative acceleration of magnitude 5 m/s/s. After half the time it takes the ball to get to maximum height has elapsed, the magnitude of the ball’s acceleration decreased by a half. At the maximum height (hmax) ball’s acceleration is zero.
Problem 8: A scooter is traveling at a constant speed v when it encounters a circular hill of y radius r = 490 m. The driver and scooter together have mass m = 133 kg.
(b) A frictionless incline is 5.00 m long (the distance from the top of the incline to the bottom, measured along the incline). The vertical distance from the top of the incline to the bottom is 1.66 m. A small block is released from rest at the top of the incline and slides down the incline. (i) How long does it take the block to reach the ground? 3.25 s (ii) What is the speed of the block just before it strikes the ground? 1.75 m/s
A brick is released with no initial speed from the roof of a building andstrikes the ground in 2.50 s, encountering no appreciable air drag. (Inother words, the brick is in free-fall.)(a) How tall, in meters, is the building?(b) How fast is the brick moving just before it hits the ground?(c) Sketch graphs of this falling brick’s acceleration, velocity, and verticalpositions as functions of time.————————————————-
Two drivers traveling side-by-side at thesame speed suddenly see a deer in the road ahead of them and beginbraking. Driver 1 stops by locking up his brakes and screeching to ahalt; driver 2 stops by applying her brakes just to the verge of locking, so that the wheels continue to turn until her car comes to a complete stop. (a) All other factors being equal, is the stopping distance ofdriver 1 greater than, less than, or equal to the stopping distance ofdriver 2? (b) Choose the best explanation from among the following:I. Locking up the brakes gives the greatest possible braking force.II. The same tires on the same road result in the same force offriction.III. Locked-up brakes lead to sliding (kinetic) friction, which isless than rolling (static) friction

SEE MORE QUESTIONS