Gravitation Test

Result

Gravitation Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Geostationary Satellites

A
need more powerful rockets to put them into larger distance orbits

B
are not useful for communication applications

C
need less powerful rockets to put them into larger distance orbits

D
need more powerful rockets to put them into smaller distance orbits

Solution

The orbital velocity of the satellite depends on its altitude above Earth. The nearer Earth, the faster the required orbital velocity. At an altitude of 200 kilometers, the required orbital velocity is just over 27,400 kph. To maintain an orbit that is 35,786 km above Earth, the satellite must orbit at a speed of about 11,300 kph. That orbital speed and distance permits the satellite to make one revolution in 24 hours.To achieve his speed,Judging from the mass of fuel needed, it stands to reason that you'd use a more powerful launch vehicle with a bi-propellant upper stage to get the satellite to GEO.
Question 2
1 / -0

Polar satellites

A
are high altitude satellites, and go around the equator of the earth in a north-east direction

B
are high altitude satellites, and go around the equator of the earth in a west-east direction

C
are low altitude satellites, and go around the equator of the earth in a north-east direction

D
are low altitude satellites, and go around the poles of the earth in a north-south direction

Solution

A polar orbiting satellite closely parallels the earth's meridian lines. It passes over the north and south poles each revolution. As the earth rotates to the east beneath the satellite, each pass monitors an area to the west of the previous pass at intervals of roughly 90 to 100 minutes. These strips can be pieced together to produce a picture of a larger area.They are used in monitoring the weather, observing the Earth’s surface, military uses including spying.