Gotta love a Physics Professor with a sense of humor.

[Anvil_X]

Physics 124 practice test question:

You are sitting peacefully at rest next to a campfire one night and suddenly a bear comes crashing out of the woods and runs at you. this very angry and very talented bear is singing as it runs toward you, emitting a perfect pitch "middle C" f=262Hz. However, you hear the pitch of the bear's voice as f=524Hz. How fast is the bear running with respect to you, the observer? (Vsound=340m/s)

 

[Fred @ Bison Tactical]

---------------- funny

 

[sharac]

Don't get it as speed would have been 170 m/s?

 

[was21]

Answer : I don't care as long as my V1> your V1 !

 

[Anvil_X]

lol yeah, I got 170 m/s too. I do believe that bear is on something.

 

[coldboremiracle]

The better answer is; .44RM>Singing Bear's m/s

 

[sharac]

I think the point is (now that i've had time to think about it) that 170 m/s is a tad too fast for a bear (though i believe "middle C" is also a tad too high). The only tune people hear (by 1st hand accounts of those who had made it) is the brown note sometimes mixed with yellow...

 

[Anvil_X]

Yeah, he said the ridiculous speed was part of the joke, and laughed pretty heartily when I ran into him this morning and said "That bear may be moving at 170m/s, but my bullet's moving at 513 m/s"

 

[Anvil_X]

The Awesome thing was that the actual test I took this afternoon included a 4 part barrel harmonics question.

 

[dogmessiah]

Yeah, he said the ridiculous speed was part of the joke, and laughed pretty heartily when I ran into him this morning and said "That bear may be moving at 170m/s, but my bullet's moving at 513 m/s"

In your reference frame or the bear's?

 

[Anvil_X]

my reference frame. can't push a 525 grain beartooth bullet out of a 45/70 any faster than 1670 FPS. but 513+170..... that's 7951 Joules. That Bear's gonna have a bad day. anybody know any good formulae for hydrostatic shock?

caliber of the bullet is .460, metplat diameter is .357 (in inches)

 

[ShtrRdy]

I had a physics prof that gave us funny questions like your's did. It really helped me remember the material.

 

[Zebra1]

My answer would have been, "The bears speed is irrelevant. MY speed would only have to be .5m FPS faster than the guy I'm with."

 

[JelloStorm]

Wouldn't the tune be higher because of the Doppler affect?

 

[sharac]

Emitted vs heard thats the Doppler shift.