Is the orbital radius of an artificial satellite determined? Who is greater in its speed around the

The orbit of each artificial satellite is fixed, but different artificial satellites have different orbital radii.

First, the cosmic velocity is large.

The track route can be determined, but the radius is not necessarily. Because the shape of the orbit may be elliptical, parabola, or hyperbola.

The speed of the first universe is great,

Radius = g*m v2, the first cosmic velocity is the orbital velocity of the earth's surface, so the greater the r, the smaller v of the satellite.

Of course you can be sure. The speed of the first universe is great,

The orbiting speed of satellites at different altitudes is different, the farther away from the earth, the lower the orbiting speed, and the orbiting speed on the earth's surface is kilometers per second, so the speed of satellites orbiting the earth is less than kilometers per second.

Artificial satellites can basically be considered to be divided into geostationary and non-synchronous satellites. Geostationary satellites have the same angular velocity as the Earth, have an orbital radius of about 36,000 kilometers, and are located directly above the equator.

First cosmic ruler key cosmic velocity: When an artificial satellite moves in a uniform circular motion around the earth near the ground, its orbital radius is approximately equal to the radius r of the earth, its centrifugal force is the gravitational force of the earth on the satellite, and its centripetal acceleration is approximately equal to the gravitational acceleration at the ground.

The first cosmic velocity is the minimum launch velocity, the maximum operating velocity of the satellite. It can only be reached when the orbital radius is very close to the Earth's radius, and the higher the orbit, the slower the speed, so in fact, most satellites are smaller than the first cosmic velocity.

The velocity of an artificial satellite orbiting the Earth belongs to ().

a.First cosmic velocity.

b.Third cosmic velocity.

c.Other cosmic velocities.

d.Second cosmic velocity.

Correct Answer: a

First of all, you need to understand the general disturbance of the speed of the first universe: the speed that the spacecraft must have in a circular motion along the surface of the earth. Its radius around it is the radius of the Earth.

And this artificial earth satellite orbits in a circular orbit with a height above the ground equal to the radius of the earth, and it is clear that its orbital radius is twice the radius of the earth.

The ratio of the velocities of the two is 2 times the root number according to the law of gravitation. First, the cosmic velocity is larger.

The artificial satellite moves in a uniform circular motion, and the mass of the satellite is m, the orbital radius is r, and the mass of the earth is m, and the centripetal force provided according to the gravitational force is f=f.

f=gmm r2

f-direction =mv2

r=mω2 r=m（2π t

2 R, thus gmm R2

mv2r=mω2 r=m（2π t

2 r=ma

The solution is v=gm r

t=2πr v

2π r3gm②

Therefore, the larger the orbital radius of the satellite, the smaller the velocity, and the greater the period

(1) The linear velocity of the satellite, i.e., the first cosmic velocity of the Earth, is.

2) A = v 2 r, v = 7900m s, the radius of the earth is about 6400ma = 7900 2 6400 =

3) The gravitational force of the instrument is the gravitational force of the platform on the instrument, and the acceleration due to gravity is ag=maSo, the gravitational force on an object with a mass of 1kg is, because it is placed on the platform, the platform supports it with force = , and according to Newton's third law, its pressure on the platform is.

(1) v1

2) GMM R2 = MA solves a=gm R2 or A=G (both answers are correct, one of them needs to be chosen according to the known conditions).

3)g=ma=mg=g=10n

f pressure = g-ma = 10-10 = 0n

Synchronization means that the angular velocity is the same as that of the earth, and if the mass of the earth is m, the radius r, the mass of the satellite m, the height h from the ground, and the angular velocity w, then the centripetal force formula is obtained:

gmm (r+h) 2=mw 2(r+h) is simplified to gm w 2=(r+h) 3

g, m, r, and w are all fixed values, so h is also a fixed value. The radius of the geostationary satellite cannot be changed.

The first cosmic velocity is the velocity of the reed as the object moves around the earth's surface.

According to the law of gravitation, gravity = gmm r = centripetal force = mv r, in the case of g and m, the more r, the larger the r, the smaller v is.

is the velocity when r = radius of the earth.

Then, when r = 2 times the radius of the earth, the velocity should =