Sunday

April 20, 2014

April 20, 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

**Related Questions**

physics - A distance of 1 m separates two objects, one with a mass of 2 kg and ...

physics - How can I calculate the tension in the two cords that are labeled A ...

physics - Three masses are aligned along the x axis of a rectangular coordinate ...

physics repost - Three masses are aligned along the x axis of a rectangular ...

Physics - Two masses, m1 = 2.0 kg and m2 = 3.3 kg, are moving in the xy-plane. ...

Math - A box holds one layer of 45 baseballs. How can the baseballs be arranged?

physics - A ball of mass 0.35 kg is fired with velocity 157 m/s into the barrel ...

physics - Two people, one of mass 85 kg and the other of mass 50 kg, sit in a ...

Physics - Two objects are dropped from the same height. One object has a mass of...

physics - A 16.3 kg block is dragged over a rough, horizontal surface by a ...