ENGINEERING MIDDLE SCHOOL

Compared to 15 mph on a dry road, about how much longer will it take foryou to stop at 30 mph on a snow-covered road?

2 to 3 times

4 to 6 times

8 to 10 times

Answers

Answer 1

Answer:

Answer:

8 to 10 times

Explanation:

For dry road

u= 15 mph ( 1 mph = 0.44 m/s)

u= 6.7 m/s

Let take coefficient of friction( μ) of dry road is 0.7

So the de acceleration a = μ g

a= 0.7 x 10 m/s ² ( g=10 m/s ²)

a= 7 m/s ²

We know that

v= u - a t

Final speed ,v=0

0 = 6.7 - 7 x t

t= 0.95 s

For snow road

μ = 0.4

de acceleration a = μ g

a = 0.4 x 10 = 4 m/s ²

u= 30 mph= 13.41 m/s

v= u - a t

Final speed ,v=0

0 = 30 - 4 x t'

t'=7.5 s

t'=7.8 t

We can say that it will take 8 to 10 times more time as compare to dry road for stopping the vehicle.

8 to 10 times

Answer 2

Answer: I would say 2-3 times but I’m not quite sure

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Explanation:

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blue sternlight

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Answers

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Learn more about lights from

brainly.com/question/19697218

Answer:

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Explanation:

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A stern light is a white light placed as closely as practical at the stern shining constantly. It covers an angle of 135 degrees, and helps show the direction of the boat.

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Answers

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Answer:

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Explanation:

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