when do we take gravity as 10 m/s² and when do we take gravity as 9.8m/s²? Please tell.
Answers
Answered by
5
Answer:
No, the value 9.8ms2 is an approximation that is only valid at or near the Earth's surface. You can go a few miles up or down and it'll still be good enough, but once you get any significant distance away from the surface of Earth, you would need to use a different value for gravitational acceleration. You can calculate the value from Newton's law of gravitation, F=Gm1m2/r2, and you'll get
g=GMr2=3.99×1014 m3/s2r2
where M is the mass of the Earth and r is the distance from the Earth's center to the point for which you are doing the calculation.The accepted value of the acceleration due to gravity is 9.81 m/s 2 . Any experimental value in the region of 10 m/s 2 is a reasonable one.
Similar questions