Giant fans! I have some ideas and questions about the physics surrounding mega-giant/giantess fantasy stories, comics, etc., and would like to share some ideas and ask some questions. The main question is this: What would it feel like to be 3,000 feet tall on Earth -- with the same proportions and density as humans, but 500 times taller? Fun question, huh? Well, I'm totally convinced of two things: 1. You'd feel 1/500th the gravity that humans feel. 2. The speed of any moving object would seem like 1/500th the speed to you, compared to a human experience. What do I base these two premises on? Simple: if an object accelerates from 0 to 1000 MPH in 10 seconds, then it accelerates at 100 MPH/sec, or a little less than 5 G's. But from the perspective of you, the mega-giant, it would seem to go from 0 to 2 MPH in 10 seconds, accelerating at 0.2 MPH/sec, or a little less than .01 G's. Furthermore, the bigger you are, the smaller Earth is in comparison. So obviously you'd feel a lot less gravity as a fantasy mega-giant. But there's a third premise I thought of, but have started to second-guess in the past day or so. It goes like this: 3. Every fluid (i.e., all liquids and gases) would feel 500 times thicker to you than it feels to humans, if you're 3,000 feet tall. This one I'm feeling a little less sure about. Would fluids really feel 500 times denser? Would they feel the square root of 500 times denser? Or perhaps not at all denser? Here's another big question: if you grew to a certain mega-height, would you be able to flap your arms and swim on the air, due to the "lower" gravity and "thicker" air? (Note that water is 784 times denser than air at sea level.) If so, how tall would you need to be to achieve this feat (with the same proportions and bodily density as a human)? And if not, why not? For example, if you watch a Boeing 747 jet take off from an airport runway, it seems to be moving quite slow relative to its huge size as it leaves the ground. But try getting a small aluminum 747 toy replica (1-foot long) to become airborne at the same slow relative speed (i.e., relative to its small size), and it'll be impossible. So, does the real 747 "feel" denser air, compared to the little replica? Or are other factors at play, here? Next, what about skydiving? If a human freefalls with his arms and legs spread out perpendicular to the fall, his terminal velocity at low altitude is about 120 MPH. But what if you're a 3,000-foot-tall mega-giant? Would your terminal velocity also be a mere 120 MPH? Would it be the square root of 500 times 120 MPH? Would it be 500 times 120 MPH? Or would it be something entirely different altogether? On the other hand, I also have some doubts about premise #3. If, as a mega-giant, your bodily density is the same as a human's, then why would liquids and gases feel any denser to you? And even if you felt 500 times lighter (due to "less" gravity), you'd still feel just as massive. Your mass would be 500-cubed times a human's. And likewise, so would your physical strength. And if you flapped your arms to try to "swim on the air," your arms would push off against 500-cubed times as much air per second, compared to a human moving his arms. But since you're also just as many times more massive, this would cancel out the effect, wouldn't it? Ahh,...so confusing! But at least there are other things I can be certain about. The molecular structure of your bodily organs would need to be completely different from that of humans, or else it would instantly collapse. Perhaps your bones and teeth would be made of carbon nanotubes, or something even stronger. Your skin would be structured differently as well, otherwise it would be scratched and cut too easily. And what about the normal people's weapons? If a bullet from a gun travels at 1,000 MPH, this would seem like a mere 2 MPH to a mega-giant. This wouldn't even cut you, and probably would bounce right off. The ammunition would have to contain explosives to inflict any harm (such as grenade guns). To severely injure or kill you, humans would need very large bombs or nukes. But if you, as a giant, clapped your hands together at 1,000 MPH (2 MPH from your perspective), there'd be so much kinetic energy released that it'd cause an explosion. (k = 0.5mv^2) Perhaps, for the story's sake, this little physics reality can be ignored! (Ha) Anyway, as an occasional fan of these kinds of stories and comics, I've been wondering about this stuff for awhile, and would enormously appreciate it if any of you physics whizzes could give me some answers to these colossal questions!