Question

the shape of the earth is oval its radius at the equator 6400 km and towards the poles is 6378 km compare the value of g at the poles and at the equator​

Answer 1

Answer:

Earth radius is the distance from the center of Earth to a point on its surface. Its value ranges from a near maximum 6,378 km (3,963 mi) at the equator to a near minimum 6,357 km (3,950 mi) at either pole. A nominal Earth radius is sometimes used as a unit of measurement in astronomy and geophysics, denoted in astronomy by the symbol R⊕. In other contexts, it is denoted {\displaystyle R_{E}}R_E or sometimes {\displaystyle {\mathcal {R}}_{\mathrm {eE} }^{\mathrm {N} }}{\displaystyle {\mathcal {R}}_{\mathrm {eE} }^{\mathrm {N} }}. The early definition of the metre such that the distance from equator to pole along the circumference is 10,000 km gives a radius roughly 6,367 km which is close to halfway between the minimum and maximum. However a better “average” is usually considered to be 6,371 km with a 0.3% variability (+/- 10 km) for the following reasons.