Recent content by TheOldDog

For my example the water and the boat experience the same gravity.

50 yrs ago that's what we did in school. When we used mass it was in grams, when we used weight it was in pounds. So, yes, to me switching to mass meant metric (g) by default. That doesn't mean I believe a ~220# crate shipped to (nominal) orbit would be as easy to maneuver as a feather on Earth...

There's no "fundamental misunderstanding" on MY part. Mass and weight definitions haven't changed in 50 yrs. I went to school when schools actually taught and kids were expected to learn. To me, changing to mass was simplifying the problem because mass doesn't change with gravity but weight...

Assuming I didn't miss something - which is why I started this thread in the first place. School was a VERY long time ago. Just tell me weight is not equal to mass times gravity and we can be done ...

My reply doesn't change regardless of who you are. I already answered the question. (Ed- Or, I should say, the question has already been answered above.) Do you even bother to read a whole thread/conversation before replying? Or do you just like jumping blind in the middle?

YOU brought it up by complaining about my use of mass instead of weight, when you've already conceded that the answer is the same using either one. How many people do you think are on here that DON"T know that weight and mass are different???? Well, I just must be stupid because I thought I...

Obviously is does make a difference since you complained about me using mass instead of weight. So you need to answer your own question. I personally don't know why you bothered to bring it up in the first place.

I learned this 50 yrs ago. You, yourself, just pointed out the connection between weight and mass. Or are you saying using the mass of liquid displacement and the mass of the vessel yields different results than using the weight of each ...??? As for why I used mass? Like I attempted to...

Exactly my thought at the time. *thumbsup* (My brain was thinking in weights, which is how I learned it, but when I posted I went to metrics because I know a LOT of science is in metrics these days - much more so than when I was in school back in the stone age.)

I love Mission of Gravity! There was nothing in there that seemed odd at all. (I thought the use of a bowl instead of the outer surface of a sphere for a map was genius!) In the SciFi novel I was reading the hull is rigid and the artificial gravity did not vary over the positions covered in the...

Fairly simple - I think - but I may have missed something; HS physics was decades ago. If a boat in a body of water on Earth has a draft of 1m, will the draft of the boat in a similar body of water on, say, Mars have the same draft? (Assume the same temperature of water.) I figured the change...

Isn't it amazing how many people in the world don't understand this? :-(

When someone earlier mentioned weight, as opposed to load, it threw me off since weight is strictly a downward (toward gravity) force. If lift is always perpendicular to thrust and thrust is always in the direction of travel, with load and drag, respectively, being opposite those forces, I...

? I always thought lift was "up" - but it seems to me you're saying lift has a horizontal component when the airplane is changing altitude?

Work requires a displacement. Since there is no displacement (change in up/down) in level flight there is no work being done in that direction.