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A solid uniform sphere has a mass of 7.0 104 kg and a radius of 1.2 m.
(a) What is the magnitude of the gravitational force due to the sphere on a particle of mass m = 0.7 kg located at a distance of 2.1 m from the center of the sphere?
N
(b) What if it is 1.0 m from the center of the sphere?
N

  • physics -

    I will gladly help the first student who shows evidence of his or her own work. You do not appear to be among that vanishing group.

  • physics -

    Okay so far i have F=Gm1m2/r^2
    G=6.67 x10^-11
    m1=.7
    m2=7.0x10^4
    what do i use for r?

  • physics -

    ball sack.

  • physics -

    a. f=(G*m1*m2)/r^2
    =(6.67x10^-11*.7*70000)/2.1^2)
    =7.4*10^-7 N
    b. f=(G*m1*m2)/r^2
    =(6.67*10^-11*.7*70000)/1^2
    =3.29*10^-6

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