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Physics Ch 14

Satellite Motion

QuestionAnswer
If we drop a bal from rest, how far will it fall vertically in the first second? If we instead move our band horizontally and drop it (throw it), how far will it fall vertically in the first second? 5 meters, 5 meters
What do the distances 8000 m and 5 m have to do with a line tangent to Earth's surface? the earth falls 5 m every 8000 m tangent to the surface
how does the direction of motion of a satellite in circular orbit compare with the curve of earth's surface? it always moves perpendicular to gravity
why doesnt grav force change the speed of a satellite in circular orbit? bc it exactally 'criss-cross' gravity
does the period of a satellite in a circule orbit increase or decrease as its distance from earth increases? increases
describe an ellipse an oval shaped path
why does grav force change the speed of a satellite in an elliptical orbit bc speed and distance varies
where is an elliptical orbit is the speed of a satllite maximum? closet - perigee
where is it a minimum? farthest - apogee
the sun of PE and KE for a satellite in a circular orbit is constant. is the sum also constant for a satellite in anelliptical orbit? no
why does the force of gravity do no work on a satellite in a circular orbit, but does do work on a satellite in an elliptical orbit? bc distance is constant which means PE is the same = KE conserved
neglecting air resistance, what will happen to a projectile that is fired vertically at 8 km/s? at 12 km/s? 8 km/s: circular orbit, 12 km/s: ellipitcal orbit
how fast would a partical hjave to be ejeted partical from the sun to leave the solar system? 620 km/s
what speed would be needed if an ejected partical started at a distance from the sun equal to earth's distance from the sun? 42.2 km/s
what is that escape speed on the moon? 2.4 km/s
althought the escape speed fromt he surface of earth is 11.2 km/s, coulnt a rocket with enough fuel escape at any speed? why or why not? yes, if 11.2 km/s is the minimum speed
Created by: meglea90
 

 



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