Physics - March 2007

is it possible to go back or forward in time?

also if you were to travel faster than the speed of light would time freeze or slow down? if someone were to try this would it work?

SEROUIS ANSWERS PLEASE

2007-03-06 15:32:57 · 5 answers · asked by Anonymous

A spot of paint on a bicycle tire moves in a circular path of radius 0.29 m. When the spot has traveled a linear distance of 1.30 m, through what angle has the tire rotated? Give your answer in radians.

On a certain game show, contestants spin a wheel when it is their turn. One contestant gives the wheel an initial angular speed of 3.10 rad/s. It then rotates through one-and-one-quarter revolutions and comes to rest on the BANKRUPT space. Through what angle has the wheel turned when its angular speed is 1.50 rad/s?

2007-03-06 15:31:49 · 4 answers · asked by Anonymous

by changing the frequency at which it vibrates at an atomic level??
i feel tht u can pretty much use the EPR paradox to prove this one,its mre like, v r custom built 2 fit here coz of the frqncy but changing it SHUD let us switch over, nt as simple as it sounds, each molecules frequency has to be calculated at an atomic level and this involves nearly 18 co ordinates for the simplest of them, and we also need to find a way to change the freqncy and SWITCH IT BACK, but electron repulsion may hinder this, and so will resonance...hmmmm....oh, btw i AM always this crazy.lol

2007-03-06 15:23:27 · 1 answers · asked by Anonymous

....and there are 5000 turns in the primary coil. How many turns are in the secondary coil? (Assume 100% efficiency.)

Any help would be awesome!

2007-03-06 15:18:34 · 3 answers · asked by Jade m 1

2007-03-06 15:17:12 · 1 answers · asked by Anonymous

2007-03-06 15:11:21 · 2 answers · asked by Aidan N 2

Can it!?!?!?!??! (School Project, thanks)

2007-03-06 15:11:13 · 4 answers · asked by koey 1

2007-03-06 15:05:58 · 3 answers · asked by liz_kmvv 1

This is another question I need answered! It's for school. I'm sure some of you understand...

2007-03-06 15:02:50 · 3 answers · asked by Anonymous

a ferris wheel rotates at an angular velocity of 0.24 rad/s. starting from rest, it reaches its operating speed with an average angular acceleration of 0.030 rad/s^2. how long does it take the wheel to come up to operating speed and how do you mathmatically write this out?

2007-03-06 14:47:32 · 3 answers · asked by tico 1

2007-03-06 14:45:41 · 2 answers · asked by Connie L 1

We are made of atoms. Somewhere inside an atom there are electrons winking in and out of existence.

So are we constantly winking in and out of existence?

I read a book on this a really, really long time ago and was reminded of it today, so my information is probably wrong. If it's right, that's trippy as hell and really cool.

2007-03-06 14:44:11 · 4 answers · asked by Anonymous

2007-03-06 14:43:45 · 2 answers · asked by Anonymous

a 3 X 10^2 kg piano is being lifted at a steady speed from ground level straight up to an apartment 10.0 m above the ground. the crane that is doing the lifting produces a steady power of 4.00 X 10^2 W. how much time does it take to lift the piano and how do you mathmatically write this out?

2007-03-06 14:37:03 · 4 answers · asked by tico 1

physics...plz plz plz help

2007-03-06 14:27:55 · 1 answers · asked by Anonymous

A certain dielectric with a dielectric constant k= 24 can withstand an electric field of 4*10^7 V/m. Suppose we want to use this dielectric to construct a 0.85uF capacitor that can withstand a potential difference of 1660V.

a. What is the minimum plate separation (in mm)?

b. What must the area of the plates be (in cm^2)?

2007-03-06 14:15:18 · 1 answers · asked by Dan L 1

A) in 1993, rebbeca twigg of the U.S traveled 3km in 217.347s . suppose she travels the entire distance at her average speed and that she accelerates at -1.72,/s^2 to come to a complete stop after crossing the finish line. how long does it take her to stop?

B) during the winter olympic games, dan jansen skated 5.00x10^2. suppose it takes him 4.00s to increase his velocity from zero to his maximum velocity, which is 10.0% greater than his average velocity during the whole run. calculate his average acceleration during the 1st 4 s.

2007-03-06 13:57:46 · 1 answers · asked by alex_yeung330 4

why do objects balance at the center of gravity?

2007-03-06 13:53:01 · 8 answers · asked by Stephanie R 1

In the BBC series, "Doctor Who," the Dalek's principle weapon is a charged particle beam (see, "Remembrance of the Daleks,"). The Cybermen, on the other hand, use portable, short-wavelength X-Ray lasers (see "Tomb of the Cybermen"). Both have refined their weaponry over the evolution of the series. Which, in reality, is the deadlier weapon...or would be, if we could build either one?

2007-03-06 13:51:37 · 2 answers · asked by Anonymous

2007-03-06 13:50:12 · 2 answers · asked by Anonymous

2007-03-06 13:42:50 · 4 answers · asked by jordansim18 1

the highest speed ever achieved on a bucycle was reached by john howard of the U.S ,the bicycle,which was accelerated at 245km/h.Suppose he wants to slow down .and he applies the brakes on his now freely moving bicycle.if the averade acceleration of the bicycle during brakinf is -3.0m/s^2, how long will it take for the bycicle's velocity to decrease by 20%?

2007-03-06 13:42:47 · 2 answers · asked by alex_yeung330 4

2007-03-06 13:34:06 · 5 answers · asked by was up 2

Examples: law1(part 2)- bumper car
please identify law's number and it's part when you give me an examples.

Thank you

2007-03-06 13:24:55 · 1 answers · asked by yeah! yeah! yeah! 1964 1

a. electron transfer between adjacent atoms
b. electron sharing between adjacent atoms
c. the attraction between polar molecules
d. a gas of freely-moving electrons

2007-03-06 13:22:44 · 2 answers · asked by Anonymous

2007-03-06 13:17:51 · 6 answers · asked by John Kenneth S 1

What is the difference between a two slot and a three slot receptacle? Why would one prefer a three slot receptacle?

2007-03-06 13:14:51 · 3 answers · asked by untilyoucamealong04 3

I know its the part on the car in back to the future, . . .but is it a real thing?

2007-03-06 13:14:30 · 4 answers · asked by JessALEX 1

What are the differences between a fuse and a circuit breaker?

2007-03-06 13:12:44 · 2 answers · asked by untilyoucamealong04 3

Electrons in a television's CRT are accelerated from rest by an electric field through a potential difference of 2.5kV. In contrast to an oscilloscope, where the electron beam is deflected by an electric field, the beam is deflected by a magnetic field.

What is the speed of the electrons?

The beam is deflected by a perpendicular magnetic field of magnitude 0.80T. What is the acceleration of the electrons while in the field?

What is the speed of the electrons after they travel 4.0mm through the magnetic field?

What strength electric field would give the electrons the same magnitude acceleration as in the acceleration of the electrons while in the field?

Why do we have to use an electric field in the first place to get the electrons up to speed?

Why not use the large acceleration due to a magnetic field for that purpose?

2007-03-06 12:52:27 · 1 answers · asked by Sir Guitarist 2