Dismiss Notice
Check out the new Application Assistant, where you can calculate your LizzyM score, see how you rank compared to other applicants, and see a list of schools where similar students were accepted.
Dismiss Notice
Hi Guest! Visit Test Prep Week now for special offers and raffles of test prep products and services!

friction problem

Discussion in 'MCAT Study Question Q&A' started by FRANK1985, 11.17.10.

  1. SDN is made possible through member donations, sponsorships, and our volunteers. Learn about SDN's nonprofit mission.
  1. FRANK1985

    FRANK1985

    Joined:
    05.27.10
    Messages:
    14
    Status:
    Pre-Medical
    Hey guys, help needed, here goes

    A meteor with a mass = 1Kg moving at 20km/s collides with jupiter's atmosphere. the meteor penetrates 100 km into the atmosphere and dsintegrates. What is the average force on the meteor once it enters Jupiter's atmosphere (ignore gravity)?

    a) 2*10^3 N
    b) 4*10^3 N
    c) 8*10^3 N
    d) 2*10^5 N

    thank you
     
  2. SDN Members don't see this ad. About the ads.
  3. shffl

    shffl

    Joined:
    09.20.10
    Messages:
    130
    A?
     
  4. FRANK1985

    FRANK1985

    Joined:
    05.27.10
    Messages:
    14
    Status:
    Pre-Medical
    that's correct, But i don't get it

    1/2mv^2= F*d
    1/2 * 1 * (20)^2 = F * 100km

    200 = F* 100km
    F= 200/100
    F= 2N

    what am I doing wrong????
     
  5. ModernAlchemist

    ModernAlchemist Transform and Transcend 7+ Year Member

    Joined:
    01.20.08
    Messages:
    1,257
    Location:
    Limbo
    Status:
    Pre-Medical
    Convert Km to m in both the velocity and the displacement.
     
  6. FRANK1985

    FRANK1985

    Joined:
    05.27.10
    Messages:
    14
    Status:
    Pre-Medical
    DUH!!!! I AM SO RETARDED! thank u so much
     
  7. ModernAlchemist

    ModernAlchemist Transform and Transcend 7+ Year Member

    Joined:
    01.20.08
    Messages:
    1,257
    Location:
    Limbo
    Status:
    Pre-Medical
    Don't worry about it haha. That has happened to me about 1 million times.
     
  8. panda2queen

    panda2queen

    Joined:
    06.01.12
    Messages:
    1
    Status:
    Pre-Medical
    hey I know this was posted a while back, but I am hoping someone can clarify this problem a little for me. I thought that you would use the equation Fdcos(theta) and cos of 0 is just one so then I thought this was set to equal the change in kinetic energy plus the change in potential energy so it would be F*d = delta K + delta U....how come above you just did F*d = delta K...where did the change of potential energy go?

    thanks!
     
  9. TcDroid4med

    TcDroid4med 2+ Year Member

    Joined:
    05.15.11
    Messages:
    29
    Status:
    Pre-Medical
    the question says to ignore gravitational force ;)
     

About the ads

Share This Page