2007-06-13 15:17:26 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Physics
While the magnitude of g is close over the range of elevations encountered on Earth, it is not exactly constant because the gravitational force of attraction changes with distance from the center of the Earth, which changes with elevation. The direction always points towards the center of gravity of the Earth, which relative to the rest of the universe is not in the same direction.
2007-06-13 15:23:48 · answer #1 · answered by Confused about life 2 · 5⤊ 0⤋
They are constant for 6,378.137km from the center or at about sea level. The gravitational acceleration decreases with distance from the center of the Earth according to the formula g= -MG/r^2, where g is the gravitational acceleration, M is the mass of the object(in this case the Earth at about 5.9736×1024 kg), G is the gravitational constant( 10^-11m^3kg^-1s^-2) and r is the distance between the object being accelerated( like yourself on Earth) and the center of the object exerting the force( the center of the Earth). From the formula you can see that as the distance(r) increases, the acceleration due to gravity decreases.
2007-06-13 15:27:44 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Not really. If the earth were a perfect sphere and had uniform mass density then g would be the same anywhere on the surface. But the earth isn't a perfect sphere, it is a oblate spheroid. Then there are all the local variations such as mountains and ocean beds that deviate from the ideal spherical surface.
2007-06-13 15:27:19 · answer #3 · answered by nyphdinmd 7 · 0⤊ 0⤋
The density of Earth isn't completely uniform, and the form of Earth isn't completely around. So 'G' could be larger over, as an occasion, an particularly dense ore physique or in a deep valley; it may be decrease over a extensive gas container or on the desirable of a mountain (the place you're in basic terms farther from the centre of the Earth). Geologists use the distortions of satellite tv for pc orbits and different gentle accelerometers to locate thrilling subterranean valuable factors. it somewhat is a sneaky thank you to peek decrease than the exterior!
2016-10-17 04:55:41 · answer #4 · answered by Anonymous · 0⤊ 0⤋
no
the densities of the mater around each point affect the aceleration due to gravity also the earth is not a perfect sphere
2007-06-13 20:32:27 · answer #5 · answered by BRENNON P 2 · 0⤊ 0⤋
well the direction is always the same --> down
magnitude --> yes
g is a constant
2007-06-13 15:22:25 · answer #6 · answered by Jared P 5 · 0⤊ 2⤋