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A highway curve has a radius of 817 m. At what angle should the road be banked so that a car traveling at 27.0 m/s (60.4 mph) has no tendency to skid sideways on the road?

Question

A highway curve has a radius of 817 m. At what angle should the road be banked so that a car traveling at 27.0 m/s (60.4 mph) has no tendency to skid sideways on the road?

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Solution

To solve this problem, we can use the physics concept of banking of roads. The formula to calculate the angle (θ) at which the road should be banked is:

tan θ = v²/rg

where: v = speed of the car = 27.0 m/s r = radius of the curve = 817 m g = acceleration due to gravity = 9.8 m/s²

Substituting the given values into the formula, we get:

tan θ = (27.0 m/s)² / (817 m * 9.8 m/s²)

Solving this will give us the value of tan θ. To find the angle θ, we need to take the inverse tangent (also known as arctan or tan^-1) of the result.

Let's calculate:

tan θ = (27.0 m/s)² / (817 m * 9.8 m/s²) = 0.945

θ = tan^-1(0.945) = 43.3 degrees

So, the road should be banked at an angle of approximately 43.3 degrees to prevent the car from skidding sideways.

This problem has been solved

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