Term
| satellite speed varys in an ___________ orbit? |
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Definition
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Term
| Is the period (time it takes for 1 orbit) greater for the moon or a satellite in close orbit? |
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Definition
| Period is greater for the moon, 27 days to get around earth, satellite: 90 min |
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Term
| The ___________ of a satellite changes in a circular orbit? |
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Definition
| velocity, it changes direction |
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Term
| The _________ of a satellite traveling in a circular orbit is constant. |
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Definition
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Term
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Definition
| Time required for a complete orbit |
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Term
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Definition
| The point in a satellite’s elliptical orbit where it is nearest the center of the Earth |
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Term
| Define: focus (plural foci) |
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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 |
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Term
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Definition
| The minimum speed necessary for an object to escape permanently from a gravitational field that holds it |
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Term
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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 |
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Term
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Definition
| The point in a satellite’s elliptical orbit farthest from the center of the Earth |
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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? |
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Definition
| 8km/5m * 5 m/1sec = 8 km/sec |
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Term
| An object falls the same __________ ___________ regardless of whether it is dropped or thrown horizontally. |
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Definition
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Term
| Satellites are beyond/within the pull of a planet’s gravitational field. |
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Definition
| within. Gravity keeps a satellite in orbit. Without gravity the satellite would keep moving in a straight line |
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Term
| When is the potential energy PE greatest in an elliptical orbit? |
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Definition
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Term
| In an elliptical orbit, where is the energy the greatest? |
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Definition
| The total energy is the same everywhere in the orbit, PE + KE |
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Term
| What happens to an object that is launched at or above 8 km/s horizontally? |
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Definition
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Term
| What happens to an object that is launched at or over 8 km/s vertically? |
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Definition
| It comes back to Earth, unless it is moving at escape speed |
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