two questions that i would like answers

My daughter is studying things like this in her Physics class, and we had a discussion a few days ago about what would happen if you drop a bowling ball and feather from a building with no wind resistance (they fall at the same speed). Therefore, all objects are affected by gravity the same.

 

1)simple it weighs 510 pounds, since no water is removed or flows out.

2)lids cut down on gas exchange I would use eggcrate if you are worried about jumping.

 

Avoid known fish that are prone to jumping if you go without the lid.

Really that is the only reason I would have a lid.

All fish have the potential to jump, but some more than others. The Blue Spotted Jaw fish will jump, many gobies as well as wrasses.

 

there would be one caveat, if fish could actually fill there swim bladders with a gas that is lighter then air. (ofcourse it would weigh the same in a vacuum tho).


fish would be awesome
if they could
float in air...
:thinking2


edit: if your wondering, I'm pretty sure fish use oxygen to fill there swim bladders.

 

Guy's 10 lbs is 10 lbs, weather its in water or air, it still weighs 10 lbs. So if you add 10 lbs to 500 lbs of water it is going to weigh 510 lbs inless it displaces some of the water.

And salt water or fresh once again 500 lbs is 500 lbs. But if it was 500 gallons the salt water at 78 degrees it would weigh 4285 lbs and fresh would weigh 4185 lbs.

 

I disagree. Gravity my be acting upon the fish, but the fish can counteract the effects with their swim bladder. The fish is not putting pressure on anything.

I think the only real way to prove this one is to get a fish bowl and fill it with water. Put it on a scale and weight it. then take a fish and weight it. Throw the fish in the water and watch the scale.

 

The bladder only affects buoyancy. On earth 10lbs is 10lbs where ever it is.

 

10lbs may be 10lbs, but it isn't putting 10lbs of force down. i think this is a topic we won't agree on until someone tests it.

 

I can't believe there is even a question. 10 lbs was added.

It's like saying if you stand on a scale with one leg, and hang the other in the air outside of the scale, that you would weigh less. (I once knew someone who believed this was true. He was an adult).

What happens when you put 10 lbs of rocks in the tank? Same thing. Mass is mass. Feathers or rocks.

 

It's like saying that water has anti-gravitational properties. Take the water out of the tank, and throw the fish in it.......