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jarptica [38.1K]
2 years ago
13

The equation v=√2.5 represents the maximum velocity that a car can travel safely on a unbanked curve when v is the maximum veloc

ity in miles per hour and r is the radius the turn in feet. If a road is designed for a maximum speed of 65 miles per hour, what is the radius of the turn?​
Mathematics
1 answer:
Sergeeva-Olga [200]2 years ago
5 0

Answer:

41.1 feet to the nearest tenth.

Step-by-step explanation:

v = √2.5 r

At 65 mph the radius of the turn r

= 65 / √2.5

= 41.1 feet.

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ElenaW [278]

The equation of the central street PQ is  -1.5x - 3.5y = -31.5 option (b) is correct.

<h3>What is a straight line?</h3>

A straight line is a combination of endless points joined on both sides of the point.

We have a straight line:

-7x+3y=-21.5  

Convert it to the general form given below:

\rm y=mx+c

\rm 3y=-21.5+7x\\\\ \rm y = \frac{-21.5}{3}+\frac{7}{3}x or

\rm y = \frac{7}{3}x-\frac{21.5}{3}

m = \frac{7}{3}   (Slope of AB line)

For the slope(m') of the PQ line:

\rm m'=-\frac{1}{m}    ( because AB and PQ are perpendicular to each other)

\rm m' = -\frac{3}{7}

We know the:

\rm (y-y')=m'(x-x')

Where (x', y') = (7, 6), we get:

\rm (y-6)=-\frac{3}{7} (x-7)

\rm 7(y-6)=-3 (x-7)\\\\\rm 7y-42= -3x+21\\\\\rm 7y= -3x+21+42\\\\\rm 3x+7y=63

\rm -1.5x-3.5y=-31.5   (multiply by -1/2 on both sides)

Thus, the equation of the central street PQ is  -1.5x - 3.5y = -31.5

Learn more about the straight line.

brainly.com/question/3493733

6 0
1 year ago
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3 years ago
Please help will mark brainliest since nobody answers my questions anymore lol
vovikov84 [41]

Answer: I think its the last one

Step-by-step explanation:

i might be wrong so its ok not o mark me the brainliest

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