Bird's speed relative to person on ground


by maff is tuff
Tags: intro physics
maff is tuff
maff is tuff is offline
#1
Jun12-11, 04:41 PM
P: 65
1. The problem statement, all variables and given/known data

The wind is blowing from west to east at 35.0 mph, and a bird in that wind is flying at 22.0 mph relative to the air.

What is the magnitude of the velocity of this bird relative to a person standing on the ground if the bird is flying from west to east relative to the air?



2. Relevant equations



3. The attempt at a solution

I think the wording is messing me up. When they say "air" does that mean wind? If so here's my attempt:

If the wind is going 35mph with respect to the ground (I assume) and the bird is going 22mph with respect to the wind. Doesn't that just mean the bird is going 57mph with respect to the ground? I think I am wrong because I think I assumed things to be true. Thanks for the help.
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
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gneill
gneill is online now
#2
Jun12-11, 04:50 PM
Mentor
P: 11,452
Wind ==> air, so your assumptions are okay.

That bird's going to have a tough time getting back to where it started from! It might have to walk home.
maff is tuff
maff is tuff is offline
#3
Jun12-11, 04:57 PM
P: 65
lol true


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