Astronauts in stable orbits around the earth are in a state of weightlessness because?

Question

(a)There is no gravitational force acting on them
(b)The satellite and the air inside it have an acceleration equal to that of gravitational acceleration there.
(c)The gravitational force of the earth and the sun balance giving null resultant.
(d)There is no atmosphere at the height at which the satellites move

Answer 1

Well, "a' is the closest. The further away you get from a gravitational source, the weaker the gravitational pull. I wouldn't say there is total weighlessness, but when they get far enough away, their weight is negligible.

Answer 2

The correct answer is:
(b)The satellite and the air inside it have an acceleration equal to that of gravitational acceleration there.


The others are all wrong because...
(a) is wrong because there is gravity there. That is what keeps the astronauts orbiting Earth instead of flying off into deep space.

(c) The gravitational forces of the Sun and Earth only balance at the Lagrange points, and astronauts in orbit never pass through those points, which are pretty far from Earth, farther than the Moon.

(d) Is a true statement but it is not the reason the astronauts are weightless. There is no atmosphere in a vacuum chamber on Earth, and things in such a chamber are not weightless.

Answer 3

None of the a bove. The reason the astronauts/cosmonauts are weightless is that they are continually falling toward the earth. Because they are falling DUE to gravity their weight disappears. They do not fall to earth because, as they fall say, 5 feet, the motion of their spacecraft carries them far enough that the curvature of the earth has changed by 5 feet (that's why the spacecraft stays in orbit, and also why it has to go so fast to maintain it's orbit). Microgravity is now used in place of the term weightlessnes, because the spacecraft, itself creates a very small (VERY small) amount of gravity.

Answer 4

Astronauts in orbit still have every bit of their original weight. They appear weightless because they and the spacecraft are all falling at the same rate. Keep in mind that the moon is 230,000 miles out and it is well within the earth's gravity influence.

Answer 5

a pair have already got the spectacular answer, yet i might prefer to characteristic an thrilling 'test' to the blend. Get a helium balloon and carry it on your motor vehicle. once you turn left, you get pushed to the spectacular, however the balloon is going left! the clarification is that the balloon responds to air density and acceleration (for this reason the push you experience while turning) and is going far flung from bigger density and the direction of acceleration. it relatively is doing precisely the comparable as while it rises interior the air..it is going in the direction of the fewer dense area of the ambience (up), this is far flung from the direction of the pull of gravity (reminiscent of the push).

Answer 6

B is the most correct answer but it is not actually correct. The astronauts are still being given weight by the force of gravity but their moment of inertia equally opposes the weight.

This can be verified by reducing their velocity to zero.

Answer 7

B is the best answer...they are in free fall..equal to that of gravitational acceleration they feel from the earth.
A cannot be the answer...gravity is everywhere

Answer 8

The correct answer is b) but it's technically incorrect.
The centrifugal acceleration of the vehicle is the NEGATIVE value of the gravitational acceleration, so they cancel each other.

Answer 9

b

Answer 10

B

Is this more home work?... hehe