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You guys have any idea of the technology needed to construct a space elevator? Most problematically, the cable must be made of a material with an extremely high tensile strength/density ratio (the limit to which a material can be stretched without irreversibly deforming divided by its...

errr.....JumboKHS is incorrect here and evette 13 is right. Using the formula F = G (mass of planet/(radius of planet)^2) and letting mass = mass/2 and radius = radius /2 u get f(2) = 2 * f(1). In JUMBOKHS' answer "Another planet has half the mass. Therefore with just this stat his weight on the...

speed2 is correct; the answer for the second mc is c) while the answer for the 1st mc is a). I am pretty sure if the answer for the 2nd one given is D it is a mistake.

Just handed in my first draft today, 7.8 thousand words. Now I just have to wait for my teacher to read it and comeback saying its rubbish so I can get on with starting it again ;).

Bleh, posted from wrong username, but I think you get the gist, basically Ngai's answer is correct, though to get at the answer you need some rather advanced methods.