t8 tinal speed 012 10.0 points A roller coaster cart of mass m starts station ar
ID: 1785721 • Letter: T
Question
t8 tinal speed 012 10.0 points A roller coaster cart of mass m starts station ary at point A, where the height above the Answer in units of m/s 006 (part 1 of 4) 10.0 points In the 1950's, an experimental train that had ground is h and a while later is at B, wher a mass of 15400 kg was powered across a level the height above ground is h/3. track by a jet engine that produced a thrustLet the acceleration of gravity be 10 m/s of 4.29 x 10 N for a distance of 506 m. Find the work done on the train. Answer in units of J. ha 007 (part 2 of 4) 10.0 points Find the change in kinetic energy What is the speed of the cart at B, ignoring the effect of friction Answer in units of J. 008 (part 3 of 4) 10.0 points -v ' Find the final kinetic energy of the train if it started from rest. 2. V20h 3. vI0h 4·V20h/5 5. V40h/3 Answer in units of J. 009 (part 4 of 4) 10.0 points Find the final spool of the train assuming no friction. Answer in units of m/s. 010 10.0 points You drop a 150 g baseball from a window 15 m above the ground. 013 10.0 points What is the kinetic energy of the baseball when it hits the ground? The acceleration due to gravity is 10 m/s2. A spring has a foree coustant of 10000 N/m. How far must it be stretched for its poten tial energy to be 24 J? Answer in units of m. 1. 22.J 2. 1.125 x 105 J 3. 1.125 J 5. 2.25 x 10 JExplanation / Answer
6)
Work = force * distance
Work = 4.29*10^5*506 = 217074000 J
7) Change in Kinetic Energy
We know work done is the change in energy
Change in Kinetic Energy = 217074000 J
8)
KEfinal = Change in Kinetic Energy = 217074000 J
9)
1/2mv^2 = 217074000
v = (2*217074000/15400)^(1/2)
v = 167.9 m/s
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