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November 29, 2014

November 29, 2014

Posted by **Stella** on Saturday, April 28, 2012 at 11:20pm.

What would the speed be, if the mass of the balls is quadrupled?

I tried using the equation v^2 = G M ((1 / R2) - (1 / R1)) and got the answer 2.07x10^-7 m/s, but the homework says that the answer is wrong.

- Physics -
**Elena**, Sunday, April 29, 2012 at 9:15amPE2-PE1 = 2KE

G•m^2/r^2 - G•m^2/R^2 = 2•m•v^2/2.

v=sqrt[G•m•(R^2 - r^2)]/r•R =

= 1.66•10^-8 m/s

- Physics -
**Stella**, Monday, April 30, 2012 at 9:51amIts wrong.

- Physics -
**Stella**, Monday, April 30, 2012 at 11:05amv = sqrt(G*.157*((1/173) - (1/379))) = 1.81x10^-7 m/s

For the second question just multiply the mass by 4.

v= 3.63x10^-7 m/s

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