Q. One can easily “weight the earth” by calculating the mass of earth using the formula (in usual notation)
A) $\frac{G}{g}R_{E}^{2}$
B) $\frac{g}{G}R_{E}^{2}$
C) $\frac{g}{G}R_{E}$
D) $\frac{G}{g}R_{E}^{3}$
Explanation
(b) $mg = \frac{GM_{E}m}{R_{E}^{2}}$; where $M_{E}$ and $R_{E}$ is the mass and radius of the earth respectively. $M_{E} = \frac{g}{G}R_{E}^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.