57 516
Assignments Done
98,8%
Successfully Done
In February 2018
Your physics homework can be a real challenge, and the due date can be really close — feel free to use our assistance and get the desired result.
Be sure that math assignments completed by our experts will be error-free and done according to your instructions specified in the submitted order form.
Our experts will gladly share their knowledge and help you with programming homework. Keep up with the world’s newest programming trends.

Answer on Mechanics | Relativity Question for CJ

Question #14623
n a quarter-mile drag race, two cars start simultaneously from rest, and each accelerates at a constant rate until it either reaches its maximum speed or crosses the finish line. Car A has an acceleration of 11.2 m/s2 and a maximum speed of 105 m/s. Car B has an acceleration of 11.9 m/s2 and a maximum speed of 85.9 m/s. (a) Which car wins the race? Type 1 for A, 2 for B. (b) By how many seconds does this car win the race?
Expert's answer
Car A
402.34m...................Space to cover
402.34 = 11.2*t^2/2....Space formula
t = √(2*402.34/11,2) = 8,476sec...time to goal
11.2*8,476 = 94,93m/sec.............top speed well below speed limit (105m/sec)
Car A can stretch the whole race at constant acceleration

Car B
t = √(2*402.34/11.9) = 8,223sec...time to goal
11.9*8,223 = 97,85m/sec.............top speed over speed limit (85.9 m/sec)
Car B can't stretch the whole race at constant acceleration; calculation approach must be different

85.9 m/sec......................Speed limit
85.9 /11.9 = 7,218sec....t1(time spent at constant acceleration)
1/2*11.9*7,218^2 = 309,99m........Space at const. acc
402.34-309,99= 92,35m...............Space at const. speed
92,35/85.9& = 1,075.....t2 (time spent at constant speed)

7,218+1,075= 8,293sec........total time to target
Car B wins the competition with an advantage worth:
-(8,293-8,476) = 0,183sec

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be first!

Leave a comment

Ask Your question