Question

The mass of the Earth is 40 times the mass of a planet and diameter is four times that of the planet. Then the acceleration due to gravity on the planet's surface is

plz tell fast and correct answer ​

Answer 1

Answer:

HEY MATE

Explanation:

Let m1, R1, g be mass, radius and acceleration for earth. m2, R2, g' be mass, radius and acceleration for planet

m1 = 80m2

R1 = 2 R2

 g = 9.8 g = (GM / R2)

(g' / g) = (M2 / R22) × (R12 / M1)

= (M2 / M1) × (R1 / R2)2

 = (1 / 80) × (2)2

(g' / g) = (1 / 20)

g' = (g / 20)

g' = (9.8 / 20)

= 0.49 m/s2  

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