A biker is riding at a steady vr=2.1km/hr. When the biker is L=8.8km. from the finish line. A bird then begins flying from the biker to the finish line at vb=6.3km/hr. When the bird reaches the finish line, it turns around and flies back to the biker. We will assume that the bird occupies only one point in space. So the bird has no length.How far does the bird travel.
2007-07-15 08:41:46 · 4 answers · asked by ... :) 2 in Science & Mathematics ➔ Physics
After they run in to each other, the bird turns around and flies from the biker back to hte finish line.Turns around again and flies back. The bird does this until the biker finishes.(the bird flies 3 times as fast as the runner runs) How far does the bird travel from the beginning(including distanced traveled from the first encounter. Answer in km. Thanks for the help. I would like to know how to work this out.
2007-07-15 08:53:46 · update #1
If you are thinking about the displacement vector, the bird went 8.8 km, same as the runner. At the start of the problem it was at one place, and at the end it was 8.8 km away (at the finish line).
But I suspect you want the total distance traveled as recorded by the bird's "odometer". You don't need to get tangled up in thinking about each trip forward and back. The bird never stops, it keeps flying full speed one direction or the other. Since it flies 3X the speed of the runner, it goes 3X the distance.
8.8 km*3 = 26.4 km
2007-07-15 10:42:01 · answer #1 · answered by sojsail 7 · 1⤊ 0⤋
At 70 mph, the train will cover 78 miles in 39/35 hrs or 1.114285 hrs. In that same amount of time, the bird will have traveled 66.857 miles.
2016-05-18 03:26:53 · answer #2 · answered by ? 3 · 0⤊ 0⤋
depends what bird it is
2007-07-15 08:51:25 · answer #3 · answered by ? 3 · 0⤊ 1⤋
it don't!
2007-07-15 08:45:57 · answer #4 · answered by madmilker 3 · 0⤊ 1⤋