A planet's moon travels in an approximately circular orbit of radius 7.0 ✕ 10⁷ m with a period of 6 h 38 min. Calculate the mass of the planet from this information. ___ kg

3.56*10²⁶ Kg.

Explanation:

Note: The gravitational force is acting as the centripetal force.

Fg = Fc ... Equation 1

Where Fg = gravitational Force, Fc = centripetal force.

Recall,

Fg = GMm/r² ... Equation 2

Fc = mv²/r ... Equation 3

Where M = mass of the planet, m = mass of the moon, r = radius of the orbit and G = Universal gravitational constant.

Substituting equation 2 and 3 into equation 1

GMm/r² = mv²/r

Simplifying the equation above,

M = v²r/G ... Equation 4.

The period of the moon in the orbit

T = 2πr/v

Making v the subject of the equation,

v = 2πr/T ... Equation 5

where r = 7.0*10⁷ m, T = 6 h 38 min = (6*3600 + 38*60) s = (21600+2280) s

T = 23880 s, π = 3.14

v = (2*3.14*7.0*10⁷) / 23880

v = 18409 m/s

Also Given: G = 6.67*10⁻¹¹ Nm²/kg²

Also substituting into equation 4

M = 18409²*7.0*10⁷ / (6.67*10⁻¹¹)

M = 3.56*10²⁶ Kg.

Thus the mass of the planet = 3.56*10²⁶ Kg.