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priscilla89

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## Homework Statement

A flat racetrack viewed from above has curves with radius of 50.0 meters and 100. meters. A car having a mass of 1.00 x 10^3 kilograms moves counterclockwise around the track at a constant speed of 20.0 meters per second. It takes the car 20.0 seconds to travel from C to D.

Radius = 50.0 meters and 100. meters

Mass = 1.00 x 10^3 kilograms

Speed = 20.0 m/s

Time = 20.0 s from C to D

1. What is the magnitude of the net force acting on the car while it is moving from A to B?

2. Calculate the net force acting on the car while it is moving from B to C.

3. Calculate the distance from C to D.

4. Compare the magnitude of the centripetal acceleration of the car while moving from D to A, to the magnitude of the centripetal acceleration of the car while moving from B to C.

5. Compare the magnitude of the car's momentum at D to the magnitude of the car's momentum at B.

6. Compare the magnitude of the centripetal acceleration of the car at A to the magnitude of the car's centripetal acceleration at A if additional passengers were riding in the car.

## Homework Equations

2 = {Pie}r / t

ac = v^2 / r

Fc = ma{c}

## The Attempt at a Solution

I'm sorry I just don't understand but I know the equations to use. Ok, but ill attempt to do it at least.

1. I don't know anything much about net force.

Would this be the equation? a = Fnet / m

I'm just really sorry but I only know about centripetal force, average speed and the centripetal acceleration. I don't know about the magnitude of the net force only magnitude of centripetal acceleration.

I would really appreciate it if you can help me. I do understand I should learn this but I wish I knew the equation to use for net force.

Okay I understand 91.

91. ac = v^2 / r

ac = (20)^2 / 50

ac = 8 for D to A

ac = (20)^2 / 100

ac = 4 for B to C

Is this correct? Thanks I really appreciate this.

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