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The gravitational force between the earth and a 2.600-kg mass on the surface of the e

  1. Oct 16, 2009 #1
    1. The problem statement, all variables and given/known data
    Calculate the magnitude of the gravitational force between the earth and a 2.600-kg mass on the surface of the earth. The distance to the center of the earth from the surface is 6370 km and the mass of the earth is 5.98e+24 kg. HINT: This problem should take you about 5 seconds to solve. If you use G to answer this problem, you are not thinking.

    M object = 2.6 kg
    M earth = 5.98 X10+24
    G constant = 9.81 m/s^2
    Distance between masses = 6,370,000 m


    2. Relevant equations
    F = G[(M1*M2)/r^2)]



    3. The attempt at a solution
    9.81[(2.6*5.98e+24)/(6,370,000^2)]
    9.81[(1.5548e+25)/(4.05769e+13)]
    9.81(3.832e+11)
    3.7589e+12 N

    Yet, Capa says this is wrong and I can't think of another way to do this. Especially not without the G Constant.
     
  2. jcsd
  3. Oct 16, 2009 #2

    Pengwuino

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    Gold Member

    Re: The gravitational force between the earth and a 2.600-kg mass on the surface of t

    This should take 5 seconds to solve as the problem stated.

    F = ma

    What is a? When one says F = mg, where g is the gravitational acceleration, what is the force acting upon?
     
  4. Oct 16, 2009 #3
    Re: The gravitational force between the earth and a 2.600-kg mass on the surface of t

    Wow... I am truly an idiot.
    Thank you.
     
  5. Mar 3, 2011 #4
    Re: The gravitational force between the earth and a 2.600-kg mass on the surface of t

    Ok, so I'm working on the same problem and feel like a complete moron because I don't see what you're getting at... could someone give me a bit more information so I can understand where this problem is heading... thanks.
     
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