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Kepler's third law says the square of the period of a satellite is proportional to the cube of its semi-major axis.
The fact that the Earth's orbit is not a perfect circle complicates matters, since it makes it depend a bit on at just what point in the orbit you cut its velocity in half.
However, if you were to somehow cancel out half the Earth's orbital velocity without destroying the Earth in the process (it's hard to know exactly how one could do this), at the very least its orbit would become a lot more eccentric.
(I've actually just used the very fun Universe Sandbox to simulate this, and it turns out that the Earth's orbit gets a lot more oval and the length of the year drops to a bit under half what it is now ... again, the precise details depend on exactly where in its orbit Earth is. Typically, though, the Earth's new orbit would take it from approximately the distance from the Sun it currently is to considerably inside the orbit of Mercury every year.)
Mossie Auer
Wiki User
∙ 14y agoIf the earth's speed would increase, then its orbit would grow larger until its speed decreased. By speeding it up, you slow it down. On the other hand if you mean what would conditions be like if the earth had an orbit so fast that the year was half as long as the present year? Then the earth's orbit would be closer to the sun than Venus. We would swelter. The oceans would boil away.
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When is earth's orbit at its closest point the sun?
Earth's perihelion happens around January 3 each year.
Earth's orbit is not a circle is it?
No, all orbits are ellipses. That includes the Earth's orbit.
What causes the cycle of seasons in earth?
The tilt of the Earth's axis in relation to the plane of its orbit.
What would happen if the inertia of the earth was increased without he sun's gravity increasing?
Inertia is measured by an object's mass. The Earth would still go around in the same orbit, because the orbit does not depend on the mass of a planet. "Inertia" is sometimes used to mean "momentum". That's mass times velocity. If the Earth's velocity increased then it would move further from the Sun. <<>> The point is that "inertia" is a nonscienific word that is used to describe different things by different people and it's best to use "mass" or "momentum" depending on what is meant.
If an astronaut is weightless orbiting the earth at 100 miles up would you experience weightlessness at the top of a 100 mile step ladder What equations would prove or disprove?
The person on the ladder would not feel weightless because they are not in orbit, they are simply at a high altitude. If they let go, they would fall straight down towards the earth's center just as any other object which is being pulled on by gravity.Orbit is achieved through velocity. With enough thrust, a rocket is able to propel an astronaut to a speed which will send him beyond the earth's gravitational field and straight into space (ie: "escape velocity"). However, by controlling the level of thrust and angle of inclination, the astronaut can be placed in an area of space that is somewhere "in-between" the pull of earth's gravity and the escape velocity. This is called "orbital velocity". The astronaut achieves ORBIT, and he is in a constant free-fall circling around the earth: not quite fast enough to escape the earth's gravity, but not so slow that he falls back to earth.When a spacecraft needs to return to earth, thrusters are fired in the direction of orbit, which decreases forward speed, and allows the craft to return to earth via the earth's gravitational field with help from atmospheric drag.
Is the escape velocity from the center of the earth different from the escape velocity from Earth's orbit?
Yes, very much so.
The velocity required to keed a satellite in orbit around the Earth is called?
circular velocity
The velocity a rocket must reach to establish an orbit around earth is called?
Orbital velocity, or Close orbital velocity.
The average velocity of the earth in its orbit is about miles per hour?
66,000
How long would it take a satellite launched to a distance of 6700 from the center of the earth to orbit the earth?
For stable orbit @ 6 700 000 metres Velocity = sq. root ( G * mass earth / orbit radius ) = 7713.576 metres / sec Time for (sidereal) orbit = (2 * pi * radius) / velocity = 5457.56 seconds.
Can you consider earth as having a uniform velocity?
No. Earth's rotational velocity is slowing. Do you mean the velocity of Earth's revolution around the sun? The earth speeds up in its orbit until it reaches perihelion, and then slows until it reaches aphelion.
Velocity is the speed and direction a rocket must have in order to orbit he earth?
save
What 2 things keep something in orbit around the earth?
Mass & Velocity .
How does the sun stay in orbit around the sun?
The Sun's gravity keeps the Earth (and all the planets) in orbit around it. Yes, but obviously there's more to it or the planet would go into the Sun. It is the Earth's orbital velocity ( technically known as its tangential velocity) which, together with the force of gravity, keeps the Earth in orbit.
A satellite in an elliptical orbit travels at constant what?
If the path is perfectly circular, yes, the speed is constant. This should not be confused with the velocity, because while speed is constant, its direction is not; therefore velocity is always changing.
How satellites stay in orbit?
The reason that satellites stay in orbit around Earth is because of two factors. Velocity and the gravitational pull between the satellite and the Earth.
The velocity a rocket must reach to establish an orbit in space is?
The velocity of rocket must reach 16x than the gravitational force of Earth to establish an orbit in space.
