- #1
dean barry
- 311
- 23
Here is the problem :
Two heavenly bodies (m1 and m2) (non orbiting) in free space at a distance D are released from rest and allowed to approach each other under gravitational influence to a final distance d.
This is the way I've worked the problem :
The total potential energy difference between the two positions
= ( ( G * m1 * m2 ) / d ) ) - ( ( G * m1 * m2 ) / D ) )
(Joules)
This also equals the final KE of the two bodies (call it KEt)
Find the final KE of both bodies (using mass ratio) :
KE (m1) = ( m2 / ( m1 + m2 ) ) * KEt
KE (m2) = ( m1 / ( m1 + m2 ) ) * KEt
To find the final velocity of each :
v (m1) = sqrt ( ( KE (m1) ) / ( ½ * m1 ) )
v (m2) = sqrt ( ( KE (m2) ) / ( ½ * m2 ) )
The momentum of each body is equal at position D
Comments please :
Two heavenly bodies (m1 and m2) (non orbiting) in free space at a distance D are released from rest and allowed to approach each other under gravitational influence to a final distance d.
This is the way I've worked the problem :
The total potential energy difference between the two positions
= ( ( G * m1 * m2 ) / d ) ) - ( ( G * m1 * m2 ) / D ) )
(Joules)
This also equals the final KE of the two bodies (call it KEt)
Find the final KE of both bodies (using mass ratio) :
KE (m1) = ( m2 / ( m1 + m2 ) ) * KEt
KE (m2) = ( m1 / ( m1 + m2 ) ) * KEt
To find the final velocity of each :
v (m1) = sqrt ( ( KE (m1) ) / ( ½ * m1 ) )
v (m2) = sqrt ( ( KE (m2) ) / ( ½ * m2 ) )
The momentum of each body is equal at position D
Comments please :