Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Birds in a 747?
Here's and old question from my flight school days...I'd like other's opinion! I can't remember what or how we decided on the answer, but we debated it for days.
A 747 is at cruise speed and level flight. In the cabin are a bunch of birds that weigh a total of 10,000 pounds. If all the birds begin to fly around in the cabin at once, does the weight of the 747 remain the same, or is it reduced by 10,000 pounds?
I forgot to mention I'd like to know about the physics that support the answer!
3 Answers
- Anonymous2 decades agoFavorite Answer
remain the same.
I think the air that the birds forces down will be equal to the bird's weight assuming it's flying in place.(Newton's Third Law of Motion)
And if they were indeed flying they would be counteracting the force
of gravity, they would not weigh anything. Weight is different from mass
however.
As long as the flight is a closed system. there won't be any change in the weight.
- themayorbynightLv 62 decades ago
Remain the same. Because the vessel is presurzied, the weight of everything in the cabin, including the air, contributes to the total weight of the plaine. Thus, even if the birds were no longer on the 'floor', they would still be in this preasurized 'bubble', so the weight would be uneffected.