• Support PF! Buy your school textbooks, materials and every day products Here!

Centripetal Acceleration ?

  • Thread starter tuffshorty
  • Start date
  • #1
11
0

Homework Statement



The mass of an electron is 9 x 10-31 kg. The mass of a proton is 1.7 x 10-27 kg. The proton and electron are about 1.0 x 10-10 m apart in a hydrogen atom. What force of gravitation exists between the proton and the electron of a hydrogen atom? What is the centripetal acceleration of the electron?

Homework Equations


Fg = G*m1*m2/d^2
* Fg is the magnitude of the gravitational force between the two point masses,
* G is the gravitational constant,
* m1 is the mass of the first point mass,
* m2 is the mass of the second point mass,
* r is the distance between the two point masses.

ar = v2 / r

ar is centripetal acceleration
v is velocity in meters per second,
r is the radius of the circle in meters

The Attempt at a Solution



I plugged in the infomation to find the gravitational force and got 1.02051 x 10^-47
but it doesn't give us the nessicary information to find the centripetal acceleration... I don't think.. can anyone help me with this?
 

Answers and Replies

  • #2
Doc Al
Mentor
44,882
1,129
What provides the centripetal force?
 
  • #3
11
0
It rotating around the hydrogen atom I think...
 
  • #4
Doc Al
Mentor
44,882
1,129
It rotating around the hydrogen atom I think...
The electron "orbits" the proton. Again, what provides the centripetal force?
 
  • #5
11
0
I suppose im not sure what you mean.. or what provides it... that is all the question said...
 
  • #6
Doc Al
Mentor
44,882
1,129
What force holds the atom together? (It's not gravity.)
 
  • #7
11
0
The electrical charge of the atom?
 
  • #8
Doc Al
Mentor
44,882
1,129
The electrical charge of the atom?
Right. The electric force provides the centripetal force. How much is the electrical force? (Hint: Coulomb's law) Once you have the centripetal force, use Newton's 2nd law to find the acceleration.
 
  • #9
11
0
5.508 x 10^-27 N is what i got when i plugged it in...
and for the acceleration i got 6120 meter/second^2
 
Last edited:
  • #10
Doc Al
Mentor
44,882
1,129
5.508 x 10^-27 N is what i got when i plugged it in...
and for the acceleration i got 6120 meter/second^2
Please show how you made those calculations.
 

Related Threads for: Centripetal Acceleration ?

  • Last Post
Replies
1
Views
514
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
15
Views
4K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
6
Views
2K
Top