When an artificial satellite is operating in space, it has the greatest impact on it

It is all kinds of cosmic rays, cosmic dust and space junk.

b.It can run on elliptical, polar circular and non-circular orbits.

According to the definition of artificial earth satellites, they are man-made objects that orbit around the earth. Therefore, option A is wrong. Artificial Earth satellites can be designed to operate in a variety of orbits, including elliptical, polar and non-circular orbits.

Therefore option B is correct.

Choose C. Because ......

The subject has finally finished writing the question!

There are three other options.

The first to send Sputnik into space was the Disturbance ().

a.China. b.United States.

c.United Kingdom. d.USSR.

Correct swim-infiltration answer: d

A, wrong, the satellite does not necessarily do circular motion, it can have an elliptical orbit B: Wrong, only near-ground satellites should be reached, and the speed of satellites far from the ground should be small, such as the speed of synchronous satellites is left and right.

C: Yes, greater than this, the centrifugal force is greater than the earth's gravitational force D: False, due to the action of air, the speed of the satellite decreases, can not maintain the original orbit, will fall into a small radius orbit, at this time the potential energy is converted into kinetic energy, the satellite speed increases, and is greater than the original orbit speed, in order to stabilize in this orbit.

AC A Yes, the uniform circular motion around the earth's axis is only a special case of satellite motion, B is wrong, the artificial satellite that does uniform circular motion around the earth, its linear velocity cannot be greater than, it is the speed of the satellite around the earth's surface to do uniform circular motion, the larger the orbital radius, the smaller the velocity, so it is the maximum operating (orbital) speed of the satellite.

c Yes, the explanation is the same as above.

d is wrong, scientists will definitely consider this problem, so once the satellite deviates from the predestination, it will be corrected immediately, and its speed will not change.

A: Yes, needless to say, you can see the picture of the satellite surrounding on the TV, and it is not a circular motion around the earth's axis.

b Yes, the first cosmic velocity is the minimum velocity of the artificial satellite to make a uniform circular motion around the earth, if it is less than his, the orbiting radius is less than the radius of the earth, and it cannot be orbited, so it must be greater than the first cosmic velocity.

c False, explained as above.

D is wrong, the development process of the satellite will definitely take into account these problems, the orbit of the satellite will be affected by the drag and change, so it will not be adjusted to the orbit, the period will be maintained in a certain orbit, so it cannot be said that the speed of the satellite will be smaller and smaller.

ABC is all in circular motion, and it is impossible for satellites to do circular motion, because it cannot meet the requirements of force balance. So choose D

Artificial satellites can be divided into anterograde orbits, retrograde orbits, equatorial orbits and polar orbits according to their operating orbits.

The orbits of artificial earth satellites can be divided into low orbit, medium orbit and high orbit according to their height above the ground.

According to the shape, it can be divided into circular orbit and elliptical orbit.

Geosynchronous orbit Geosynchronous orbit: When a satellite orbits the earth in a prograde orbit, its orbit period is the same as the rotation period of the earth, and this kind of satellite orbit is called geosynchronous orbit.

Geostationary satellite orbit: If the geosynchronous orbit satellite orbits the earth in an orbit of 35,786 kilometers above the earth's equator, because the angular velocity of its orbit around the earth is the same as the angular velocity of the earth's rotation, it seems to be stationary from the ground, and this kind of satellite orbit is called geostationary satellite orbit.

Sun-synchronous orbitSun-synchronous orbit: The orbital plane of a satellite rotates around the Earth's axis of rotation due to the flattening rate of the Earth. If the direction of rotation and angular velocity of the orbital plane of the satellite around the Earth's axis of rotation are the same as the direction and average angular velocity of the Earth's revolution around the Sun, then such a satellite orbit is called a sun-synchronous orbit.

Artificial satellites are the most launched, most versatile, and fastest-growing spacecraft. Sputniks are a thriving family, and if they are divided into three main categories by use: scientific satellites, technical test satellites, and application satellites.

Scientific satellites are satellites used for scientific exploration and research, mainly including space physical exploration satellites and astronomical satellites, which are used to study the upper atmosphere, the earth's radiation belt, the earth's magnetic high-layer, cosmic rays, solar radiation, etc., and can observe other stars.

Technical test satellites are satellites that conduct new technology tests or conduct tests for application satellites. There are many new principles, new materials, and new instruments in aerospace technology, and whether they can be used or not must be tested in the sky. What is the performance of a new satellite, it can only be applied after it is launched into the sky for actual "exercise" and successful experiments; Animal testing must be carried out before people go to space, and these are the missions of technical test satellites.

Application satellites are satellites that directly serve mankind, and they have the largest variety and quantity, including: communication satellites, meteorological satellites, reconnaissance satellites, navigation satellites, geodesic satellites, earth resources satellites, interception satellites, and so on.

The minimum velocity at which an artificial satellite can be launched on Earth to enable the satellite to move around the Earth is ()aFirst cosmic velocity.

b.Second cosmic velocity.

c.Third cosmic velocity.

d.Velocity of light. Correct Answer: a

The emergence of artificial satellites has provided an excellent opportunity for the study of the rays of the Brothers. （）

a.That's right. b.Mistake.

Correct Answer: a

Under the action of resistance, the satellite should slow down in the original orbit, the gravitational force will be greater than the centripetal force, the object will do centripetal motion, the orbital radius will become smaller, the artificial satellite will move in a uniform circular motion around the earth, and provide centripetal force according to the gravitational force, let the mass of the satellite be m, the orbital radius is r, and the mass of the earth is m, ab, by gmm r2

mv2r solves: v=

The radius of the GM R track will gradually decrease and the linear velocity will increase, so A is wrong and B is correct;

c. by gmm r2

m4 2t2r to get t=2 r3

gm, the orbital radius will gradually decrease, and the period will decrease, so c is correct;

d. The centripetal force is equal to the gravitational force f=gmm r2

The radius of the track will gradually decrease, and the centripetal force will increase, so d is correct;

Therefore: BCD

a. Provide the centripetal force of circular motion according to the gravitational force.

gmmrmrω

The angular velocity of the satellite = GMR

Knowing that the farther away from the earth is the larger the orbital radius, the smaller the angular velocity of the satellite, so a is wrong;

b. The first cosmic velocity is the maximum linear velocity of the uniform circular motion around the earth, and when the satellite moves around the earth in an elliptical orbit, the velocity at perigee is greater than the first cosmic velocity but less than the second cosmic velocity, so option b is correct;

c. The centripetal force of circular motion is known by gravity

r mvr, get the linear velocity v gmr of the satellite

It is known that the radius of the satellites in the same circular orbit is the same, so the linear velocity is the same, so c is wrong;

d. The orbital plane of the geosynchronous satellite coincides with the equatorial plane, so it is impossible for the geosynchronous satellite to pass over the earth's poles

Therefore, b