Question
which of newton's laws (1, 2, or 3)are used in the following:
1) spaceship reaches the speed for orbit around the earth,
2) pushing the shuttle forward in space
3) the force needed to escape earth's atmosphere
1) spaceship reaches the speed for orbit around the earth,
2) pushing the shuttle forward in space
3) the force needed to escape earth's atmosphere
Answers
Damon
1) F = m a #2
G m Me/r^2 = m v^2/r specifically
2) conservation of momentum #1
specifically:
mass remaining on craft * speed of craft + mass of exhaust * speed of exhaust (which is negative) = original mass of craft* original speed of craft
BUT
You can also say action = reaction
force of exhaust on rocket = force of rocket on exhaust - #3
3) well the important thing is law of gravity, but at every altitude F = m a
G m Me/r^2 = m v^2/r specifically
2) conservation of momentum #1
specifically:
mass remaining on craft * speed of craft + mass of exhaust * speed of exhaust (which is negative) = original mass of craft* original speed of craft
BUT
You can also say action = reaction
force of exhaust on rocket = force of rocket on exhaust - #3
3) well the important thing is law of gravity, but at every altitude F = m a