Question

Ex. 5
Given mass of earth is 6 x 1024 kg and mean
radius of earth is 6.4 x 10° m. Calculate the
value of acceleration due to gravity (g) on the
surface of the earth.​

Answer 1

g=

R

2

GM

Given, G=6.67×10

−11

Nm

2

kg

−2

R=6.4×10

6

m

g=9.8ms

−2

∴M=

G

gR

2

=

6.67×10

−11

9.8×6.4×6.4×10

12

≈6×10

24

kg