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Your turn, then.
The Delta Tau Chi Deathmobile is heading full steam at the mayor's grandstand during the Homecoming parade. As they approach, the Deltas yell "Ramming Speeeeeed", tailing off with a pitch of C5 (523.25 Hz). If Dean Wormer hears the pitch as D5, how fast is the Deathmobile traveling?
Assume a dry fall day in Faber (roughly sea level) with no wind and a temperature of 15C.
Assume a dry fall day in Faber (roughly sea level) with no wind and a temperature of 15C.
Spoiler Alert, click show to read:
Correct?
I think you are computing for D#5. D5 is 587.33Hz
Oops. That's not the only mistake I made last attempt.
Spoiler Alert, click show to read:
You guys are such nerds.
Your turn, Krazilec. 
Originally Posted by Drunk Clown:
You guys are such nerds.
You guys are such nerds.
Originally Posted by Drunk Clown:
You guys are such nerds.
You guys are such nerds.
Originally Posted by drone:
The Delta Tau Chi Deathmobile is heading full steam at the mayor's grandstand during the Homecoming parade. As they approach, the Deltas yell "Ramming Speeeeeed", tailing off with a pitch of C5 (523.25 Hz). If Dean Wormer hears the pitch as D5, how fast is the Deathmobile traveling?
Assume a dry fall day in Faber (roughly sea level) with no wind and a temperature of 15C.
I didn't know how to figure this one out, but I am very interested in the principles behind it and the math to solve it broken down. I take it you have to exploit the doppler effect to figure out the speed?The Delta Tau Chi Deathmobile is heading full steam at the mayor's grandstand during the Homecoming parade. As they approach, the Deltas yell "Ramming Speeeeeed", tailing off with a pitch of C5 (523.25 Hz). If Dean Wormer hears the pitch as D5, how fast is the Deathmobile traveling?
Assume a dry fall day in Faber (roughly sea level) with no wind and a temperature of 15C.
Originally Posted by The Gutmensch:
I didn't know how to figure this one out, but I am very interested in the principles behind it and the math to solve it broken down. I take it you have to exploit the doppler effect to figure out the speed?
I didn't know how to figure this one out, but I am very interested in the principles behind it and the math to solve it broken down. I take it you have to exploit the doppler effect to figure out the speed?
http://en.wikipedia.org/wiki/Doppler_effect
http://en.wikipedia.org/wiki/Frequencies_of_notes
it's all there just scroll down page all you need then is the speed of sound at 15c in the medium in this case dry fall air.
f=((v/v-vs)*f0) rearrange it to get vs on it's own
v = velocity of waves in the medium at 15c in this case dry fall air is the medium (vs negative cos it's moving toward observer)
vs= velocity of the source
vr= velocity of the observer it's zero so can be ignored
f= detected frequency = d5
f0= actual frequency = c5
I haven't done any of this in a long long time since first or second yr year engineering science, so I cant claim I remember it well I got it from wiki too.
This is just one I don't know myself: why do adult cats meow? They don't do it towards other cats, they only meow towards humans.
God
Originally Posted by Veho Nex:
God
I'm fairly certain cats don't believe in God. In a cat's mind, they are the only omnipotent beings around. God
Originally Posted by Tellos Athenaios:
This is just one I don't know myself: why do adult cats meow? They don't do it towards other cats, they only meow towards humans.
I was going to answer that, but gaelic cowboy beat me to it. This is just one I don't know myself: why do adult cats meow? They don't do it towards other cats, they only meow towards humans.
If I may ask: how does an anatomist (for crocodiles and birds) determine the size of an animal's muscles, based on its bones? I've always tried to figure it out, but resources on that are shockingly few here.
Originally Posted by Ibrahim:
I was going to answer that, but gaelic cowboy beat me to it.
If I may ask: how does an anatomist (for crocodiles and birds) determine the size of an animal's muscles, based on its bones? I've always tried to figure it out, but resources on that are shockingly few here.
I dunno but have look at thisI was going to answer that, but gaelic cowboy beat me to it.
If I may ask: how does an anatomist (for crocodiles and birds) determine the size of an animal's muscles, based on its bones? I've always tried to figure it out, but resources on that are shockingly few here.
http://www.priweb.org/ed/lol/invdinos.html
Originally Posted by :
What did dinosaurs look like? Paleontologists can reconstruct the body of most dinosaurs using marks on the bones called "muscle scars." Muscle scars form where muscles attached to the bones by tendons and ligaments. The large the scar, the more massive the muscle. Although rare, dinosaur skin impressions give scientists an idea of what they looked like from the outside. Since pigments do not fossilize, nobody really knows what color dinosaurs were. Artists use the colors of modern dinosaur relatives (reptiles and birds), as well as those of other large animals to guess at the color of dinosaurs.
Right sounds like they use things like muscle scar plus no doubt the already quite large body knowledge on anatomy collected over the years, there pretty much making the most educated guess available I suppose.What did dinosaurs look like? Paleontologists can reconstruct the body of most dinosaurs using marks on the bones called "muscle scars." Muscle scars form where muscles attached to the bones by tendons and ligaments. The large the scar, the more massive the muscle. Although rare, dinosaur skin impressions give scientists an idea of what they looked like from the outside. Since pigments do not fossilize, nobody really knows what color dinosaurs were. Artists use the colors of modern dinosaur relatives (reptiles and birds), as well as those of other large animals to guess at the color of dinosaurs.
Now I going to be a bit sneaky here and say I got two mwah ha ha
Here is my question
Rob the Robot Rover has landed on the planetoid Omicron Persei 8 back on Earth the guys at Nasa are trying to work out the mass of said planetoid. Robs sensors are detecting that the 1kg mass of Rob (1kg back on Earth) now weighs 1.6 Newtons on Omicron Persei 8. The planetoid has been mapped as having a diameter of 4000km and the gravitational constant is
6.7*(10^-11) Nm^2/kg^2
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