How many geosynchronous orbit communication satellites have been developed in China, for example?

Geosynchronous satellites are divided into geostationary satellites, geostationary satellites, and geosynchronous satellites in polar orbits.

a.Synchronous orbit turns to satellites.

b.Alternate orbital synchronous satellites.

c.Two-way orbit static satellite.

d.Tilt-orbit geostationary satellites.

Correct answer: d

Geosynchronous satellites are often used in communications, meteorology, radio and television, missile warning, data relay, etc., to achieve continuous work in the same area. Geosynchronous satellites are divided into geostationary satellites, inclined geostationary satellites, and polar geosynchronous satellites. Geosynchronous satellites are artificial satellites that operate from west to east in geosynchronous orbit.

The orbital period is the same as the Earth's rotation period and is 1 sidereal day, which is 23 hours, 56 minutes and 4 seconds. <

Geosynchronous satellites are often used in communications, meteorology, radio and television, missile warning, data relay, etc., to achieve continuous work in the same area. Geosynchronous satellites are divided into geostationary satellites, oblique geostationary satellites, and polar geostationary satellites. Geosynchronous satellites are artificial buried satellites that operate from west to east in geosynchronous orbit.

Its orbital period is the same as that of the Earth, which is 1 sidereal day, i.e. 23 hours, 56 minutes and 4 seconds, and is about 35,786 km above the ground and 42,164 km from the center of the Earth. Geosynchronous satellites are often used in communications, meteorology, navigation, and military intelligence search.

The main feature is Pei Chun.

Feature 1: The altitude of the satellite from the earth is about 36000 kmFeature 2: The orbit is equipped with a rolling bridge located on the equatorial plane of the earth.

Feature 3: The operating period and direction are completely synchronized with the rotation of the earth.

In short, it's -

To the people of Earth, this star is forever fixed somewhere in the sky.

The characteristics are: 1. The running direction is consistent with the rental state of the earth's rotation direction.

2. The orbit period is equal to the rotation period of the earth and is located in a circular orbit on the plane of the earth's equator.

3. Its altitude is about 35860 meters, and the orbital speed of the satellite is about kilometers per second, which is equal to the angular velocity of the earth's rotation.

a. Change the orbit from the Q point on the track 1 to the track 2, and the failure to accelerate away from the center of the circle will move, so the speed becomes larger, so A is wrong;

b. Change the orbit from point p of track 3 to track 2, and decelerate to do a motion close to the center of the circle, so the speed becomes smaller, so b is correct;

c. On orbit 2, when moving from point Q to point P, it is necessary to overcome gravity to do work, and the velocity becomes smaller, so the velocity at point Q is greater than the velocity at point P, so C is correct;

d. According to a=gm

r knows that when the satellite is operating normally in the orbit of 1 and Chanian shed 2, when it passes through the same point q, the acceleration is equal, so D is correct;

Therefore: BCD

Strictly speaking, there's no right question for that.

a. The geostationary satellite is stationary relative to any point on the ground, and is moving in a uniform circular motion relative to the center of the earth b.

c. The moon orbits the earth one day.

d. 3 can cover the whole world but do not include the north and south poles, because the orbit of the synchronous satellite is fixed at about 36,000 kilometers above the equator, because the earth is round, it is impossible to cover the north and south poles in this orbit, and it is impossible to achieve how many of them. In fact, it is true that the area after 81 degrees north and south latitude to the pole is a communication blind spot for geosynchronous orbit satellites, and the communication in this area is provided by polar orbit satellites.

Select A, BC error does not need to be explained, D item only needs 3 pieces.

Untie; a. If it is assumed to be "synchronized" at any point other than the plane where the equator is located, then the plane of its orbit is not in the same plane as the gravitational attraction of the earth, which is impossible, and the orbit of the synchronous satellite can only be located in a circular orbit on the plane of the earth's equator, and the altitude is also definite

b. Provide the centripetal force according to the gravitational force and list the equation: gmmr=ma

Acceleration a=gmr

is the acceleration of gravity on the earth's surface, according to the gravitational force on the earth's surface, which is equal to gravity: gmmr=mg

g=gmr= so the centripetal acceleration of the geostationary satellite is less than, so b is correct, c, the period of the geostationary satellite must be the same as the period of the earth's rotation, and its period is 24h, so c is correct d, the centripetal force is provided according to the gravitational force, and the equation is listed: gmmr=mv

r gets: v=gmr

7900m s is the first cosmic velocity, which is also the orbital velocity of a near-Earth satellite, and the orbital velocity of the largest circular motion

The orbital radius of the geostationary satellite is greater than that of the near-Earth satellite, and according to the expression v, it can be found that the linear velocity of the geostationary satellite must be less than the first cosmic velocity, so d is correct

If you choose the wrong question, you should choose: a

1) The orbital plane of the geosynchronous satellite must coincide with the equatorial plane of the ground pin carrying the ball, which is a necessary condition for the realization of the movement of the geosynchronous satellite, and the geosynchronous satellite does not directly enter the synchronous orbit after launch, but first enters the near-earth parking orbit, and then enters the transfer orbit, and finally enters the synchronous orbit after a series of adjustments Although the orbital plane of the geosynchronous satellite should coincide with the plane of the Earth's equator, the launch does not have to be launched on the equator (2) The centripetal force provided by gravity obtains: gmm(r+h)2=m4 2t2(r+h) After collation, H= 3GMT24 2-R is substituted into the data to obtain:

h = A: (1) The orbital plane of the geostationary satellite must coincide with the equatorial plane of the Earth (2) The distance of the orbit of the geostationary communication satellite from the Earth's surface is approximate.