A newly discovered planet has a radius twice as large as earth\'s and a mass fiv

Question

A newly discovered planet has a radius twice as large as earth's and a mass five times as large. Part A What is the free-fall acceleration on its surface? Express your answer to two significant figures and include the appropriate units. 5 4 SubmitPrev Previous Answers Request Answer X Incorrect: Try Again; 27 attempts remaining; no points deducted Use either an integer, decimal number, or scientific notation for the numeric portion of your answer. Do not use calculations or functions. Provide Feedback Next>

Explanation / Answer

free fall acceleration is given by:

g = G*M/R^2

M = mass of planet = 5*Me

R = radius of planet = 2*Re

Me = 5.98*10^24 kg

Re = 6.371*10^6 m

Using above values:

g = 6.67*10^-11*5*5.98*10^24/(2*6.371*10^6)^2

g = 12.28 m/sec^2

OR

g = (5/4)*ge = (5/4)*9.81 = 12.26 m/sec^2

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