2006-06-12 07:42:08 · 8 answers · asked by susannah2b 3 in Science & Mathematics ➔ Physics
no but that would start an earthquake in China
2006-06-12 08:50:29 · answer #1 · answered by Anonymous · 7⤊ 5⤋
This is a classic question, and the answer is quiteobviously that from the outside of the truck the weigth must be the same. If it were not, then we would have created a way of getting actionat a distance. The question is, why?
To stay in flight the birds must exert a thrust downwards through their wings equal to their weight. In the closed truck the thrust will be on the floor of the truck. So the weight of the birds on the floor will be replaced by an equalt downthrust of their wings.
2006-06-12 08:09:14 · answer #2 · answered by Epidavros 4 · 0⤊ 0⤋
Yes. The budgerigars add to the weight of the truck, if they take off, the truck becomes lighter.
I should say, IF the poles the birds are roosting on are attached somehow to the truck. Then yes, it'd be lighter.
2006-06-12 07:44:19 · answer #3 · answered by flammable 5 · 0⤊ 0⤋
The truck would have exactly the same mass, but would show a lighter weight on a scale.
Consider if, instead of a truck-full of little budgies, you had a single giant budgie, who could lift the truck right into the air. The truck would certainly appear lighter to the scale-watcher then, wouldn't it? Of course, when the giant budgie stopped exerting thrust to lift the truck, it would immediate return to "normal".
If you were measuring the weight of the system (truck and budgie and air and all) it would remain the same during the operation, but that wasn't the question.
Hope that helps.
2006-06-12 08:01:56 · answer #4 · answered by Grendle 6 · 0⤊ 0⤋
the truck would weigh more for a few moments, When the birds fly off, they exert a thrust on the poles, which is in turn transmitted to the truck. This overall reaction adds to the vertically downward force on the truck. Finally of course, relieved of its load, the truck weighs less than what u started with.
2006-06-12 07:55:22 · answer #5 · answered by Anonymous · 0⤊ 0⤋
The weight would stay exactly the same because the birds are still in the truck and are part of the load of the truck. If you sat on a boat and blew the sail, it wouldn't move faster would it?
2006-06-12 08:55:45 · answer #6 · answered by montenapoleone 3 · 0⤊ 0⤋
Yes but not if the truck was hermetically sealed
2006-06-12 10:01:27 · answer #7 · answered by bwadsp 5 · 0⤊ 0⤋
the truck would weigh the same
2006-06-12 07:44:38 · answer #8 · answered by jhn_hls 2 · 0⤊ 0⤋