# Recent content by y90x

1. ### Radial acceleration, help needed

Ohh, that’s the final velocity when it’s at the end of the arc ? So I find the velocity when it’s halfway , then apply it in v^2/r
2. ### Radial acceleration, help needed

That would mean the 200 m changes to 100 m And it’ll give me a higher number , 79.03 m/s^2
3. ### Radial acceleration, help needed

That first one was a typo , in the paper it says 320 km/h
4. ### Radial acceleration, help needed

Homework Statement A car at the Indianapolis 500 accelerates uniformly from the pit area, going from rest to 320km/h in a semicircular arc with a radius of 200 m. Determine the tangential and radial acceleration of the car when it is halfway through the arc, assuming constant tangential...
5. ### Rounded top hill question

Homework Statement a 1000kg sports car moving at 20m/s crosses the round top of a hill (radius of 100 m) . Determine the normal force on the car Homework Equations Newton’s second law F=ma The Attempt at a Solution I figured out the centripetal acceleration Ac= v^2/r = 4 m/s^2 My attempt...
6. ### Car on a bank problem need help ?!!

Thanks guys , I was able to finally solve it :) !
7. ### Car on a bank problem need help ?!!

So I just set both equations equal to either Fn or Ff and go from there ?
8. ### Car on a bank problem need help ?!!

To be sure , first I find one unknown variable then plug in to another equation to find another and all?
9. ### Car on a bank problem need help ?!!

Would it be to derive the mg into vertical and horizontal components as well?
10. ### Car on a bank problem need help ?!!

Okay, Noted . Now I’m having some difficulties, so for vertical components , it will be : Fncos(theta) = mg+ Ffsin(theta) And the other equation being : Fnsin(theta) + Ffcos(theta) = mv^2/r Do I isolate Fn and substitute It into the other equation to solve for Ff ? Or do I break down Ff...
11. ### Car on a bank problem need help ?!!

So do I disregard the angle ? And oh shoot ! I forgot about the vertical component of friction

Yes
13. ### Car on a bank problem need help ?!!

Homework Statement If a curve with a tedious of 80m is perfectly banked for a car traveling 70km/h, what must be the coefficient of static friction for a car not to skid when traveling at 90 km/h ? Homework Equations Newton’s second law F=ma The Attempt at a Solution To find the angle of the...
14. ### Gravitational problem, spacecraft orbital period

Homework Statement I need help getting started with this problem At what altitude above the surface of the Moon must a lunar module orbit in order to complete each orbit in 1 h 49 min 39 s? Homework Equations g= Gm/r^2 ? The Attempt at a Solution Not quite sure how to start or anything , any...