Ch18 Gravitational fields Flashcards
1
Q
What is newton’s law of gravitation
A
F=-GMm/r^2
- any 2 bodies attract each other with a force that is directly proportional to their product of mass and inversely proportional to the square distance between them
2
Q
Speed of a satellite
A
- satellite orbiting the earth so
Fg=Fc
GMm/r^2 = mv^2/r
rearrange for V
3
Q
Keplers first law
A
the orbit pf a planet is an ellipse with the sun at one of the 2 foci
4
Q
Keplers second law
A
a line segment joining a planet and the sun sweeps equal area during equal time intervals
5
Q
keplers third law
A
the square of the optica time period of is directly proportional to the cube of the optical distance
6
Q
gravitational potential energy
A
the work done required to bring an object from infinity to a point in the gravitational field
E =-GMm/r
E = mgh
7
Q
Escape velocity
A
KE converted to Eg
KE=Eg
1/2mv^2=GMm/r
rearrange for V
