Kepler's law

1. Nov 14, 2014

sya deela

1. The problem statement, all variables and given/known data
An asteroid of mass m is in circular orbit of radius r around the sun with speed v.It has an impact with another asteroid of mass M and is kicked into a new circular orbit with a speed 1.5v.What is the radius of the new orbit in terms r?

2. Relevant equations (v1)^2/(v2)^2 = (r2)^2 / (r1)^2

3. The attempt at a solution is it using equations based on kepler's second law or third law.

2. Nov 14, 2014

Orodruin

Staff Emeritus
Hi sya, and welcome to Physics Forums!

You need to provide a more detailed attempt and show your work. Let us assume that your idea is correct, how would you use that to find the new radius?

3. Nov 14, 2014

sya deela

is it correct?i used based on kepler's third law.

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4. Nov 14, 2014

Orodruin

Staff Emeritus
What you have used is Newton's gravitational law, not Kepler's laws. Also, we generally do not allow posting problems or attempted solutions as image attachments or links as it requires significantly more efforts from helpers. If you want people to help you, you should make the minimal effort of typing out the full problem and your full attempt at a solution in-forum. Please refer to the Guidelines for Students and Helpers as well as the Physics Forums General Guidelines for more information.