To maintain an orbit that is 22,223 miles (35,786 km) above Earth, the satellite must orbit at a speed of
about 7,000 mph (11,300 kph)
. That orbital speed and distance permits the satellite to make one revolution in 24 hours.
Why is a satellite velocity not constant?
An object moving in a circular orbit at a constant speed has a changing velocity. This is because velocity is a vector quantity that depends on speed and direction. The object in orbit is
accelerating
, even though its speed remains constant, because its velocity is changing.
Do satellites have a constant velocity?
As mentioned earlier in Lesson 4, a satellite orbiting about the earth in circular
motion is moving with a constant speed
and remains at the same height above the surface of the earth. It accomplishes this feat by moving with a tangential velocity that allows it to fall at the same rate at which the earth curves.
Do satellites change velocity?
The orbital velocity of the satellite
depends on its altitude above Earth
. The nearer to Earth, the faster the required orbital velocity. At an altitude of 124 miles (200 kilometers), the required orbital velocity is a little more than 17,000 mph (about 27,400 kph).
How do satellites maintain their velocity?
As the satellite is launched from the carrier rocket, a rocket thrust acts to throw it out in the desired direction at the prescribed speed. … In such circumstances,
occasional rocket thrusts
are needed to maintain the motion of the satellite, otherwise it will fall to Earth.
What is value of G?
Its value is
9.8 m/s
2
on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s
2
. When discussing the acceleration of gravity, it was mentioned that the value of g is dependent upon location.
What is the G in physics?
The
universal gravitational constant
(G) relates the magnitude of the gravitational attractive force between two bodies to their masses and the distance between them. Its value is extremely difficult to measure experimentally.
What happens if a satellite slows down?
If the satellite slows down it would
crash into the object it is orbiting
. If the satellite speeds up, it may spin off into space. The satellite could be knocked or moved closer or farther from the object it is orbiting.
What does a satellite look like from Earth at night?
A: Yes, you can see satellites in particular orbits as they pass overhead at night. Viewing is best away from city lights and in cloud-free skies. The satellite will
look like a star steadily moving across the sky for a few minutes
. If the lights are blinking, you probably are seeing a plane, not a satellite.
What happens when satellite speeds up?
If the satellite is moving too quickly then the gravitational attraction between the Earth and the satellite is too weak to keep it in orbit. If this is the case,
the satellite will move off into space
. This occurs at speeds around or above 11,200 metres per second (m/s).
How long can a satellite stay in orbit?
The satellites in the very low end of that range typically only stay up for
a few weeks to a few months
. They run into that friction and will basically melt, says McDowell. But at altitudes of 600 km—where the International Space Station orbits—satellites can stay up for decades.
What two factors keep all satellites in orbit?
The initial speed of the satellite maintained as it detaches from the launch vehicle is enough to keep a satellite on orbit for hundreds of years. A satellite maintains its orbit by balancing two factors:
its velocity (the speed it takes to travel in a straight line) and the gravitational pull that Earth has on it
.
Why do satellites not collide with each other?
There have been no observed collisions between natural satellites
of any Solar System planet or moon. Collision candidates for past events are: … The objects making up the Rings of Saturn are believed to continually collide and aggregate with each other, leading to debris with limited size constrained to a thin plane.
How is 9.81 calculated?
In SI units, G has the value 6.67 × 10
– 11
Newtons kg
– 2
m
2
. The
acceleration g=F/m
1
due
to gravity on the Earth can be calculated by substituting the mass and radii of the Earth into the above equation and hence g= 9.81 m s
– 2
. …
Where is gravity the strongest?
Mount Nevado Huascarán in Peru has the lowest gravitational acceleration, at 9.7639 m/s
2
, while the highest is at
the surface of the Arctic Ocean
, at 9.8337 m/s
2
. “Nevado was a bit surprising because it is about 1000 kilometres south of the equator,” says Hirt.
Is value of G actually constant?
| Values of G Units | 4.30091(25)×10 − 3 pc⋅M ⊙ – 1 ⋅(km/s) 2 |
|---|
