Physics question to challenge your intellect?
596509
1) Flat and hard surface. By flat I mean the microtexture, so the sound doesn't get scattered, convex like a parabole is possible if the sound originates from the center of the parabole.\n2) There has to be a large distance between wall and origin for accurate meassurement. Or you would need very fast measurementdevices.\n3) Since sound is carried by a medium the speed of that medium has to be taken into account. If you measure both ways then the speed of the medium, assuming that it didn't change directions, on one measurement has an negative effect and on the otherone an equal positive effect. By taking the average this is levelled out.\nEach measurement involves two reaction times; the reactiontime to the lightflash and the reactiontime to the sound. If both are equal, the measurement would be exact. Assuming that there is no significant difference for the reaction to sound and the one to light the error made by difference in both reactiontimes can be both ways. So by increasing the number of measurements and taking the average you increase the accuratesse of your measurement. If the error in measurement due to reactiontimes would allways be one way (allways to high or allways to low soundspeed) then taking the average would have a negative effect on the accuratesse, because the measurement with the smallest error would allways be the most accurate.
263164
I won 10 points!\n\nThis is pretty easy. Try to stump me with harder ones.
194029
Hi!\nI change my field of study from physics to biophysics but still its a great pleasure to solve a problem in physics if you dont mind.\nWish to see your project.\nBye
355325
Newtons, or sometimes kilograms
190569
Only if you show your work and do not expect them to do the question for you; only to provide hints and guides.\nhttp://www.physicsforums.com
7127
here's a site with pics that might give you some ideas:\n\n\nhttp://www.physics.usyd.edu.au/competition/comp1998/comp98.html
653943
gravity and inertia\n\nread more below. It is really fascinating.
456902
1. Could you explain in your own words how space are actually bent?\n2. Why can't we achieve the velocity of light?\n3. Do you approve Star Trek's warp theory?\n4. What do you eat every day that makes you so genius?\n5. Is playing violin hard?
933787
plz ask in physics category
815673
OK I'm cheating - I put this answer up a little while ago.\n\nA quick and dirty idea for a physics project would be one based on electromagnetism. Without knowing what grade you're targeting, a simple one that has a fair amount of pizzazz is to build a gauss rifle. Checkout http://sci-toys.com/scitoys/scitoys/magnets/gauss.html\n\nThe sci-toys site has some other pretty cool stuff that you might find useful as well.\n\nFor a more advanced example, you can make a small rail gun that applies similar principles but can have a much larger kick. Just do a search on "rail gun experiment".\n\nEnjoy!!
1018412
do you really want someone else to think for you?\nhmmm...well then...\nhere it goes...\n1. look in your math book...there are examples of how to do this problem...\n2. same answer as above!!!\n#3... same...\n\n#4!!!! remember Einstein solved "un-solve able" problems!!!
1109075
Einstein's law of gravitation. It certainly looks nicer than Newton's :P
79420
Hey babygurlgonnaloveonu you have asked what is totally QUESTION NUMBER ONE in physics. It's an exciting question which many teachers secretly don't understand and so their students get this hazy idea and kind of go thru the motions. \n\nWow, it is so basic, that it took a super-genius, I mean way smarter than Einstein, to figure it out. A good old farm boy, astrologer, magician & alchemist, religious fanatic, mathematician and all around kook. Yep. Sir Isaac Newton. You gotta wonder what kind of parents would name their kid "Sir"\n\nWell we all know what a force is, it is a sort of push or pull -- think of it as something that changes or *tries to change* the motion of stuff.\n\nNewton first figured out that if you leave a thing alone, or if the pushes and pulls on it cancel out, then it will sit there like a lump. Like those drivers wearing hats, and like sit there after the light has already turned green two minutes ago. \n\nOr else a thing  will keep moving in the same straight line direction and speed  like those drivers wearing hats who go 40 mph on the expressway with their turn signal blinking on and on. This is known as "THE HAT LAW".\n\nAll was well until he noticed that things move faster in an amount equal to how much you bully them or push them around. Twice the force, twice the fasterness and fasterness (also known as acceleration). This is called the "YOU BIG BULLY LAW".\n\nThen he discovered a fly in the ointment. His HAT and BULLY laws didn't really explain all that much. Something was gumming up this beautiful theory. We call it MASS and it is still an unknown mystery as to what it really is. So we vaguely call it the amount of stuff or matter in a thing. \n\nSo he found out that for a certain force the faster-isity (acceleration) is cut in half if you double the mass. The bully has to push twice as hard to fasterize two little kids. So he was like "I'll just add that in, and all will be cool". The "YOU BIG BULLY LAW" and "THE HAT LAW" totally did it all. Wa ta da babee!\n\nBut then Newton had a road accident. He was gunning his Harley over London bridge at like 250 when a bug  hit him in the mouth and knocked out one of his wooden teeth. He was all "Why am I so in pain?". And the bug as it squooshed said "Help! I'm a bug!"\n\nSo spitting out the splinters of his wooden tooth and the splattered bug, he had this revelation. He realized that because he was moving so fast, and the  bug slowed down so fast, that even a eentsy mass like a bug was like taking a hammer to his tooth. \n\nHe noticed that the force was equal to the mass of the bug times the speed of impact all happening in a brief moment. Since Newton spoke Latin (he  was the love child of Joe Newton and an Italian governess) he wrote "Fastus buggus ina momentum hurtus like crazy." Today we call this "momentum". It is just "mass times speed" or "force times a small moment of time". \n\nAnd he realized that the bug smashed up his tooth, but also that the bug was squashed (like a bug) because they were trading the EXACT same amount of momentum. The force on the tooth by the bug in the moment of time was PRECISELY equal to the  smacko-ing the tooth used to stop the bug dead. \n\nHe said "Hey, like he broke my tooth, but I killed him soooo dead!" He did the math and found that the force of the bug on the tooth was equal to the force of the tooth on the bug! \n\nNo way did the two equal forces cancel, after all, his tooth was hammered to splinters, and the bug was flattened. They were equal and opposite, but since one was on the tooth, and the other force was on the bug they did serious damage! Today we call this the "HELP I'M A BUG" law.\n\nNow our man 'Zack was all set. He wrote down his three laws:\n\nTHE HAT LAW (beeep! beeep! Move it Hat Guy!)\nTHE YOU BIG BULLY LAW (betcha can't kno
1082808
mathematical dilemma. there is no answer to the question. Well at least none that are known. Just like the elements we know there out there but we have to figure them out first.  just like Einstein theory of fusion. its passable just not proved.
948476
I won't show in details since it's hard to type out the work, but you'll get the rest, here it goes:\n\na)\nWork = mgd  *d=change in height\nW = (10kg) (9.8m/ss) (sin15) (-7.5m) = -190J\n\nb)\nW=(friction coef)(natural force)(distance traveled)\nnatural force = (cos15)(10kg)(9.8m/ss)\nW= (0.4) (cos15) (10kg) (9.8m/ss) (-7.5m) = -280J\n\nc) \nW=Force x distance\nW=(100N)(7.5m)=750J\n\nd)\n(initial KE)+ (puller work)=(gravity work) + (frictional work) + (final KE)\n(final KE) - (initial KE) = 750J - 280J - 190J = 280J\n\ne)\n(final KE) - (initial KE) = 280J\n*solve for final v\nv = squareroot (2 x [280j+ (1/2)(10kg)(1.5squared)] / 10kg) =7.63m/s
630060
Speed of.. gravity? :S
864791
A.) 3.02891 seconds\nB.) 290.1 m/s\n\nTrust me... =)