Posted by Stella on Saturday, April 28, 2012 at 11:20pm.
Two baseballs, each with a mass of 0.157 kg, are separated by a distance of 379 m in outer space, far from any other objects. If the balls are released from rest, what speed do they have when their separation has decreased to 173 m? Ignore the gravitational effects from any other objects.
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 9:15am
PE2PE1 = 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 9:51am
Its wrong.

Physics  Stella, Monday, April 30, 2012 at 11:05am
v = 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
Answer This Question
Related Questions
 Physic  Two softballs, each with a mass of 0.125 kg, are separated by a ...
 Physics  Suppose that each of the three masses in the figure below has a mass ...
 Physics  Mechanics and Ocsillatory Motion  Suppose that each of the three ...
 Physics  Two objects x and y with a total mass od 2.5 x 10^3 kg are joined ...
 Physics  On earth, two parts of a space probe weigh 14500 N and 6400 N. These ...
 physics  On earth, two parts of a space probe weigh 19200 N and 4130 N. These ...
 Physics  On earth, two parts of a space probe weigh 17300 N and 3260 N. These ...
 Physics  On earth, two parts of a space probe weigh 18300 N and 4440 N. These ...
 physics  2) Two objects are initially the same height above the ground. ...
 physics  2)Two objects are initially the same height above the ground. ...
More Related Questions