# Search results

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...

16. ### Projectile problem on Pluto

I’m not trying to find mass, the mass is given . I’m looking for gravitational acceleration, I keep getting 0.65 but I’m not sure if that’s correct
17. ### Projectile problem on Pluto

That’s what I’m trying to figure out
18. ### Projectile problem on Pluto

I don’t understand
19. ### Projectile problem on Pluto

Fg=(G(m1)(m2))/r2 But then , where would the other mass come from ? Only one mass is given
20. ### Projectile problem on Pluto

Fg = (Gm)/r^2 ?
21. ### Projectile problem on Pluto

Homework Statement An astronaut throws a rock at 12 m/s at an angle of 25° above horizontal from a height of 3.25 m above the surface. How far horizontally does the rock travel before hitting the surface of Pluto? Pluto has a mass of 1.27 E22 kg And a radius of 1.14E6 m Homework Equations...
22. ### Roller coaster problem involving velocity

I just realized it was m/s^2 Thank you
23. ### Roller coaster problem involving velocity

Homework Statement A roller coaster reaches the top of the steepest hill with a speed of 7.0 km/h. It then descends the hill, which is at an average angle of 43° below horizontal and is 46.0 m long. What will its speed be when it reaches the bottom? Assume the coefficient of kinetic Friction...
24. ### Vectors problem

You’re right , thanks
25. ### Determine the elevator's acceleration

My teacher explained to use two different equations when two variables are unknown, I was trying to find another equation to substitute T with
26. ### Vectors problem

Homework Statement I’m working on a problem that requires adding 3 vectors . And while I was following the book, it said to find the angle to divide the y over the x components of the resistant , and showed the angle to be -1.25 but then follow d to change to -51 . How did it change ? The book...
27. ### Find the force to push a book sideways on a table

Oh, so I just include the friction of the hand Ff= Uk(Fn) =.5•10N = 5 Then add both friction forces together Okay thanks !
28. ### Determine the elevator's acceleration

Wouldn’t it be the other way around ? Up on the man and down on the dumbwaiter ?
29. ### Find the force to push a book sideways on a table

Homework Statement Place a book flat on a table and press down on it with your hand. Now suppose the hand-book and table- book values of are 0.50 and 0.40, respectively; the book's mass is 0.90 kg and your downward push on it is 10 N. How much horizontal force is needed to keep the book moving...
30. ### Determine the elevator's acceleration

So how do you find tension ?