An artificial satellite circling the earth completes each orbit in 144 minutes. (a) find the altitude of the satellite.

Explanation:

given,

time taken to complete the each orbit = 144 minutes

                      t = 144 x 60 = 8640 s

mass of the earth = 5.98 x 10²⁴ Kg

radius of earth,R = 6.38 x 10⁶ m

Using Kepler's 3rd law

r = 9.1 x 10⁶ m

the altitude of the satellite

H = r - R

H =  9.1 x 10⁶  - 6.38 x 10⁶

H = 2.72 x 10⁶ m

ill do it for 100, also this isnt 80 its 40

d.7.5cm is your answer