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polet [3.4K]
3 years ago
11

12–139. Cars move around the “traffic circle” which is in the shape of an ellipse. If the speed limit is posted at 60 km>h, d

etermine the minimum acceleration experienced by the passengers.
(60)2



y

2

0)2 = 1


*12–140. Cars move around the “traffic circle” which is in the shape of an ellipse. If the speed limit is posted at 60 km>h, determine the maximum acceleration experienced by the passengers.

12–142. The race car has an initial speed vA = 15 m> s at
a. If it increases its speed along the circular track at the rate at = (0.4s) m> s2, where s is in meters, determine the time needed for the car to travel 20 m. Take r = 150 m.




x


Probs. 12–139/140

Physics
1 answer:
Sergio039 [100]3 years ago
5 0
Check the attached file for the answer.

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(B) 392 J

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Explanation:

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 \frac{-(ΔKE+ΔU)}{h}[/tex] = \frac{-(392 + (-2940))}{12}

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