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Andre45 [30]
3 years ago
9

A roller coaster car crosses the top of a circular loop-the-loop at twice the critical speed. Part A What is the ratio of the no

rmal force to the gravitational force? What is the ratio of the normal force to the gravitational force? n/FG=2n/FG=2 n/FG=3n/FG=3 n/FG=4n/FG=4 n/FG=5n/FG=5
Physics
1 answer:
4vir4ik [10]3 years ago
3 0

Answer:

n/(FG) = 3.

Explanation:

<u>At the top of the loop-the-loop, the normal force is directed downwards</u> as well as the weight of the car. So, the total net force of the car is

F_{net} = N + mg

<u>By Newton's Second Law, this force is equal to the centripetal force</u>, because the car is making circular motion in the loop.

F_{net} = ma = \frac{mv^2}{R}\\N + mg = \frac{mv^2}{R}

The critical speed is the minimum speed at which the car does not fall. So, at the critical speed the normal force is zero.

0 + mg = \frac{mv_c^2}{R}\\v_c = \sqrt{gR}

If the car is moving twice the critical speed, then

N + mg = \frac{m(2v_c)^2}{R} = \frac{m4gR}{R} = 4mg\\N = 3mg

Finally, the ratio of the normal force to the gravitational force is

\frac{3mg}{mg} = 3

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from b to a speed is 600-40 = 560

let t be the number of hours of flight. This would mean it would have traveled a distance of 640 miles and the distance yet to travel is 2400-640t
Time left will be (2400-640t)/640. But if they were to return to a it would fly 640t miles at 560mph which will take (640t/560) hrs

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3 years ago
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4 0
3 years ago
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levacccp [35]
The potential energy= mass times gravity times height. However, we are missing height. Gravity is a constant that is 9.8 on Earth. We then solve for height by dividing 350 by 10 and then 9.8 to get about 3.5.
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