PH-UY 1013 Lecture Notes - Lecture 16: Momentum, Escape Velocity
28 views4 pages
Document Summary
Gravitational pe of m 2 due to m 1 u= What is u g of earth due to the sun? (6. 67 10. If we were to stop earth"s movement around the sun, it would be pulled into the sun. Suppose an object is launched vertically from the surface of the earth w/velocity of 8 km/s. How high does it go? (ignoring air resistance) r2. 0 = ( y=3. 265x10 6 wrong bc acceleration due to gravity isnt 9. 8 for this object. 1. 2km/s this is the escape velocity (no ar) F ab = force of b on a (no other forces at all) +m b dv a dt (m a v a +m b v b )=constant d dt p a +p b =constant. Total momentum of system doesnt change as long as a only feels a force from b and vice versa. If there are no external forces acting on the system then the total momentum of the system is conserved.