Physics - December 2007

P=(ε^2)R/ (R+r)^2

differentiate P with respect to R to show that R is maximum when it is equal to r

Help much appreciated

2007-12-27 03:04:53 · 2 answers · asked by shama 1

I'm not sure really, and also not sure about the TV show 'Most Haunted' because it's great and everything, but that Wiji board thing I find a bit surreal.

2007-12-27 02:46:08 · 19 answers · asked by emilyeparsons 2

ın other words, throughout the day the sun appears to be movıng relatıvely slowly across the sky eg around noon. (of course ıt ıs just the appearance of movement as a result of the rotatıon of the earth) . but then ıt appears to hasten and dıp quıcker and quıcker as ıt sets

2007-12-27 01:53:55 · 3 answers · asked by Big Rig 1

what has laughing gas (Nitric Oxide) has to do with scientology
Nitogen the opposite of Oxygen? Hatred, Jealosy or suicides.
Can it be microchiped. Thetans vs God.

2007-12-27 00:55:46 · 7 answers · asked by dele 1

to prevent radiation from escaping the microwave? the buzzard is the noise microwave ovens make to tell you the food is done. or it doesnt matter?

2007-12-27 00:42:34 · 9 answers · asked by Anonymous

i want an experiment about this

2007-12-26 22:25:43 · 6 answers · asked by phisizst 1

Please give accurate information. very important

2007-12-26 19:55:43 · 3 answers · asked by Vignesh V 1

Anybody here have a degree in something but scored lower than they would expect on an IQ type test...


I hear all the time people say there is no real correlation between academic success and IQ ...I'm wondering if there are any real examples of this...

2007-12-26 19:32:54 · 8 answers · asked by Anonymous

2007-12-26 18:41:43 · 10 answers · asked by Unknown QWQ 1

I read this in Wikipedia: "EM radiation in a vacuum always travels at the speed of light, relative to the observer, regardless of the observer's velocity."

Does that mean that if I was in a car going 60 mph, the speed of light would be 670,616,629.2 mph to me? Then would it still be 670,616,629.2 mph to a stationary observer or 670,616,699.2 mph?

2007-12-26 15:38:11 · 5 answers · asked by Anonymous

I wanted to know that, for example you have a sound system and it can go faster than sound. If it goes twice the speed of sound(343m/s) would you be able to hear the stereo?

2007-12-26 15:00:39 · 8 answers · asked by Anonymous

Kepler's Second Law states that the imaginary line between any planet and the sun sweeps equal areas in equal times as it orbits the sun. If the gravitation between the sun and the planets were somehow switched off and the planets no longer followed elliptical paths, would Kepler's equal area in equal time law still hold true?

a) Yes, the Second Law would still hold, even with gravity off.

b) No, Kepler's laws relate to elliptical orbits produced by gravity. Turn off gravity and Kepler's Second Law is meaningless.

2007-12-26 14:50:45 · 10 answers · asked by ? 6

2007-12-26 14:05:59 · 7 answers · asked by Anonymous

2007-12-26 13:04:26 · 47 answers · asked by harryb 5

A 4.00 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0 degrees with the horizontal. The block accelerates forward at 6.00m/s/s. determine the coefficient of kinetic friction between the block and the ceiling.

2007-12-26 12:10:45 · 3 answers · asked by Anonymous

A box slides down a 30.0 degree ramp with an acceleration of 1.20 m/s/s. Determine the Coefficient of kinetic friction between the box and the ramp.

2007-12-26 11:27:58 · 3 answers · asked by Anonymous

some one answered a Q on here a few days ago and from that i learnt that temperature isn't what i thought it was
it is the measurement of hot to cold
or something very similar
could you please without using long big words and complicated phyics exsplain it more please
and how it comes around
p.s i understand some stuff

thanks

Mr IP

2007-12-26 09:17:33 · 9 answers · asked by Mr IP 2

Scientifically, like the sky is blue...

2007-12-26 09:07:51 · 7 answers · asked by Deli D 2

2007-12-26 07:49:36 · 7 answers · asked by raven 1

2007-12-26 06:35:15 · 9 answers · asked by Anonymous

if you had two people on a toboggan and then pushed them down a hill and then later on you add one more person to the two so now you have three. would the speed of the toboggan increase or decrease.

2007-12-26 06:29:30 · 4 answers · asked by Anonymous

when lightning strikes water it travels through the water right, branching out and effecting everything thats in the water sort of like when a radio slips into a bathtub. Then why is it that we have so much fish in our oceans, when there is so many lightning storms over the oceans at any given time? When a lightning strikes water does it kill every living thing in the water? Is it true that whenever a lightning strikes water all the fish die in the vicinity, how large is the radius of effect?

also electric eels, when they send of an electric charge don't they run the risk of killing themselves?

2007-12-26 06:08:01 · 7 answers · asked by Anonymous

2007-12-26 05:37:38 · 14 answers · asked by Anonymous

Find the resisance of the longer wire, assuming that the resistivity and density of the material are unchanged.

2007-12-26 05:32:58 · 7 answers · asked by Anonymous

When this mass is increased by 2.0kg, the period is found to be 3.0s. Find m.

2007-12-26 05:24:54 · 4 answers · asked by Anonymous

2007-12-26 05:20:47 · 21 answers · asked by Anonymous

I know a real vacuum can't exist (third law of thermodynamics and common sense), but what's the closest we can get?

And why the hell can't I wrap my head around something as simple as nothing? It just seems absurd to me, as to the vacuum scientists of old.

2007-12-26 04:45:49 · 10 answers · asked by Anonymous

how did they know it wouldn't have put a whole in the universe
so it say

2007-12-26 04:42:23 · 5 answers · asked by Jeff 1

While I'm at it, are all known elementary particles point particles?

More importantly, how the hell do we know they're point particles? How do you expect to tell a point particle from a really really small particle? How can point particles even contain information to interact with the world with?

2007-12-26 04:42:04 · 6 answers · asked by Anonymous

Or is it just a useful construct that does not satisfy E = mc², and in fact doesn't fit into any real equation?

And what early physics teachers tell you, that potential energy "turns" into kinetic energy and so forth, is just another confusing and inappropriately informal misrepresentation?

Where's the rigor in potential energy? Does it have a differential equation? Can it even really be measured, or just deduced?

2007-12-26 04:34:10 · 5 answers · asked by Anonymous