# Shared Flashcard Set

## Details

Chapter 14: Satellite Motion Questions
Chapter 14 Satellite Motion Questions
17
Physics
12/29/2011

Term
 satellite speed varys in an ___________ orbit?
Definition
 elliptical
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
 Speed
Term
 Define: period
Definition
 Time required for a complete orbit
Term
 Define: perigee
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
 Define: escape speed
Definition
 The minimum speed necessary for an object to escape permanently from a gravitational field that holds it
Term
 Define: ellipse
Definition
 An oval-shaped 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
 Define: apogee
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
 vertical distance
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
 apogee
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
 It becomes a satellite
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
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