A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

two identical charged balls hang from the ceiling by insulated ropes equal length l=1.5m. A charged q=25*10^-6 is two identical charged balls hang from the ceiling by insulated ropes equal length l=1.5m. A charged q=25*10^-6 is applied to each ball. then the two ball hang at rest and supporting rope has an angle of 25degree respect to the vertical. what is the mass of each balls?

  • This Question is Closed
  1. Kainui
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    \[F=ma\]\[F _{e}=k _{e}(\left| q _{1} \right|\left| q _{2} \right|)/r^2\] You can set these equations equal to each other, and since the balls aren't moving, you know that the forces are in equilibrium. Using trigonometric functions separate the forces into x and y directions so that you can use substitution to solve for your unknowns. You know that there will be an acceleration downwards due to gravity and no acceleration in the x direction. You think you can solve it now?

  2. TuringTest
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1329595296046:dw|In the x-direction we have\[\sum F_x=F_e-T\sin\theta=k\frac{q^2}{r^2}-T\sin\theta=0\]in the y-direction we have\[\sum F_y=F_g-T\cos\theta=mg-T\cos\theta=0\]eliminate T between these two equations and solve for m (r can be found through trig)

  3. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    m=71.86 right?

  4. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.