If a planet has 3 times the radius of the Earth, but has twice the density as th

Question

If a planet has 3 times the radius of the Earth, but has twice the density as the Earth, what is the gravitational acceleration at the surface of the planet?(g 9.8 m/s^2) A railroad freight car, mass 15,000 kg, is allowed to coast along a level track at a speed of 2 m/s. It collides and couples with a 50,000 kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy in the 15,000 kg car is preserved in the two coupled cars after collision? A block of wood has density 0.50 gm/cm^3 and mass 1500 gm. It floats in a container of oil (the oil's density is 0.8 gm/cm^3). What volume of oil does the wood displace? A hot-air balloon has a volume of 2979 m^3. The density of the air outside the balloon is 1.205 kg/m^3, and the density of the hot air inside is 0.9441 kg/m^3. How much weight can the balloon lift?

Explanation / Answer

Multiple questions allowed to answer only 1 question at a time.

1) According to the info provided we know that

g = Gm/r2

R = 3r ( provided )

V = 27v

D = d

so, M = 27m

so, g of the planet = GM/R2

= G*27m/(3r)2

= 3Gm/r2

= 3*9.8

= 29.4 m/s^2 ==================================ANSWER ) OPTION A)

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