Term
satellite speed varys in an ___________ orbit? 

Definition


Term
Is the period (time it takes for 1 orbit) greater for the moon or a satellite in close orbit? 

Definition
Period is greater for the moon, 27 days to get around earth, satellite: 90 min 


Term
The ___________ of a satellite changes in a circular orbit? 

Definition
velocity, it changes direction 


Term
The _________ of a satellite traveling in a circular orbit is constant. 

Definition


Term

Definition
Time required for a complete orbit 


Term

Definition
The point in a satellite’s elliptical orbit where it is nearest the center of the Earth 


Term
Define: focus (plural foci) 

Definition
For an ellipse, one of the two points for which the sum of the distances to any point on the ellipse is a constant 


Term

Definition
The minimum speed necessary for an object to escape permanently from a gravitational field that holds it 


Term

Definition
An ovalshaped curve that is the path of a point that moves such that the sum of its distances from two fixed points (foci) is constant 


Term

Definition
The point in a satellite’s elliptical orbit farthest from the center of the Earth 


Term
If a projectile falls 5 m in 1 second, and the curvature of the Earth is 8 km/5m. What is the velocity that a projectile must have to be a satellite? 

Definition
8km/5m * 5 m/1sec = 8 km/sec 


Term
An object falls the same __________ ___________ regardless of whether it is dropped or thrown horizontally. 

Definition


Term
Satellites are beyond/within the pull of a planet’s gravitational field. 

Definition
within. Gravity keeps a satellite in orbit. Without gravity the satellite would keep moving in a straight line 


Term
When is the potential energy PE greatest in an elliptical orbit? 

Definition


Term
In an elliptical orbit, where is the energy the greatest? 

Definition
The total energy is the same everywhere in the orbit, PE + KE 


Term
What happens to an object that is launched at or above 8 km/s horizontally? 

Definition


Term
What happens to an object that is launched at or over 8 km/s vertically? 

Definition
It comes back to Earth, unless it is moving at escape speed 

