Question

A 600 kg car traveling at 30 m/s is going around a curve having a radius of 120m that is banked at an angle of 25.0°. The coefficient of static friction between the car's tires and the road is .3. What is the magnitude of the force exerted by friction on the car?
A) 1590 N
B) 3430 N
C) 7240 N
D) 7820 N
E) 795
Answer: A

Yeah, I have a test tomorrow and out of the whole guide of the exam this is the only question I've been havig issues with. I mean I know I already have the answer but I don't know how to get that answer, I get different ones but it seems that they're incorrect.
Help me

Answer 1

Let me think

Answer 2

I really don't know if that answe is correct, that's what my professor gave me.

Answer 3

I got 1748 N

Answer 4

I did something wrong

Answer 5

I got it

Answer 6

Your professor used EXACT measurements

Answer 7

us =0.3
Mass= 600 kg
gravity = 9.8
cos(25) = 0.90

Answer 8

But why are we using m*g instead of normal force to calculate friction?

Answer 9

I don't know, I thought I needed to divide normal force in Nx and Ny, right?

Answer 10

Force of normal = mass*gravity
Normal(N) = mg

Answer 11

Those equations apply eventhough the car is moving?

Answer 12

yeah

Answer 13

any more questions?

Answer 14

That'd be all, thanks!!

Answer 15

Good luck on your test