Can you explain how scientist explain gravity is proportional to mass? How can parts of Canada be low in gravity than all of the other regions?
2007-05-15 21:16:53 · 8 answers · asked by high-lighter 3 in Science & Mathematics ➔ Physics
Gravity DOES depend on density.
More specifically, gravity depends on the distribution of mass (or in general relativistic terms, the distribution of stress energy). F = GMm/r^2 only applies for idealised point particles - or equivalently for very large r.
Clearly local density fluctuations in underlying rocks do affect local gravity, and there is even a NASA satellite measuring this.
2007-05-15 22:17:05 · answer #1 · answered by Anonymous · 0⤊ 0⤋
gravity is not proportional to the mass. The Netwon's gravitational equation states that mg= GMm/r^2. For an object of mass m located on the surface of the earth, the m cancels off. Therefore, which scientist said that.
When m is on the earth's surface, the formula becomes
g = GM/R^2. The M there is not a dependent variable. Its the mass of the earth for Earth system.
How parts of Canada can have a lower gravity is against the law of physics. Canada should have gravities higher that regions of the equator. Maybe. those places have a higher altitude, or may be some form of an upward buoyancy force exist there.
2007-05-23 04:31:04 · answer #2 · answered by Pikay C 1 · 0⤊ 0⤋
All the mass is considered to be concentrated at its centre of gravity. So, density is not considered relevant.
Gravity changes inversely as the square of the distance between the two centres of gravity. So, if the altitude of a place (height above mean sea level) changes, the gravity changes too.
2007-05-15 21:28:35 · answer #3 · answered by Swamy 7 · 0⤊ 1⤋
Gravity = G * M / R^2
M = density * volume
So
g = G * d * V / R^2
Hence gravity is also proportional to density.
As far as Canada is concerned, Radius of Earth there must be greater resulting in smaller value of g. So gravity is lesser there.
Hope this helps.
2007-05-15 21:26:59 · answer #4 · answered by Prashant 6 · 0⤊ 2⤋
Density is Mass compressed.
However, the amount of compression (density) does affect the effect/speed of gravity.
2007-05-15 21:20:39 · answer #5 · answered by FLSTC 2 · 0⤊ 1⤋
Density is Mass compressed
2007-05-23 13:11:19 · answer #6 · answered by мαɢɢιє 4 · 0⤊ 0⤋
Believe it or not, but it also depend on the density ! A compressed ....
(To be continued)
2007-05-21 09:58:07 · answer #7 · answered by Anonymous · 0⤊ 0⤋
You are dreaming in technicolor, what you suggeast is pure science fiction.
2007-05-20 07:33:57 · answer #8 · answered by johnandeileen2000 7 · 0⤊ 0⤋