What would be the weight of a 59.1-kg astronaut on a planet with the same density as earth and having twice earth's radius? . i am getting 290, but i dont know if that is . a) 580n. b) 290n. c) 1160n. d) 2320n. e) 1200n

The astronaut's weight on the Earth's surface can be  determined from  
F = m g = 579.2 N subsituting  mass equal to 59.1 kg and acceleration due to gravity equal to 9.8 m/s². When the variables are mass of the earth and the radius of the earth, F = k m / r². Thus, doubling the mass of the earth would double his weight and doubling the radius would decrease the original weight by 1/4.  Hence, 579.2 N* 2* 1/4 equal to 290 N. Answer is B.

The answer is  a.first and third quarters