Re: Not that bad......
Volume moves as cube of radius, so double volume means radius at a factor of cube root of 2, approx 1.25 times Earth's, and surface gravity is proportional to mass (8 X) over teh square of radius (approx 1.5). So yes, right second time, 5g is about right.
And 'super-earth' (used here) or 'Earth-like' (seen elsewhere to describe for example Gliese system planets) to describe a planet?? In my book, 'super-earth' means like earth, but larger, and 'Earth-like' means 'Earth-like'.
For 'Earth-Like' I would expect at least a solid surface, a temperature range close to that seen on earth (maybe -50 to 50 C), surface gravity from 0.5-2G . So this doesn't even fit the most basic criteria. After all, I wouldn't call Venus 'Earth-like'