Physics - January 2007

If the kinetic energy of a 0.62kg stone is 2.3J at its highest point and 9.4J at its lowest point how do I calculate the height at the highest point.

2007-01-16 11:28:09 · 5 answers · asked by mr.puss 1

i have to make two spins for a project and i was wondering if any body had any ideas on how to make one and what materials to use

2007-01-16 11:21:16 · 1 answers · asked by annamariecreed 1

I Need A FAST ANSWER PLEASE!

2007-01-16 10:22:25 · 3 answers · asked by machater81 1

2007-01-16 09:29:40 · 11 answers · asked by themanwithnoname 2

A 21 kg round table is supported by three legs equal distances apart on the edge. What minimum mass, placed on the table's edge, will cause the table to overturn?

2007-01-16 09:04:06 · 4 answers · asked by Chris H 2

that the multiverse is a reality? Or do many people think that one cannot extrapolate from the quantum level to the universal?
(Be gentle with me. I can barely add and subtract. Though I did read a book on quantum mechanics once. It had pictures).

2007-01-16 08:53:14 · 6 answers · asked by Anonymous

2007-01-16 08:28:28 · 9 answers · asked by Anonymous

2007-01-16 08:22:04 · 4 answers · asked by bayonetpostal 2

2007-01-16 08:20:35 · 2 answers · asked by Anonymous

Hi folks,
My sound sytem connected to this repeatedly makes long farting noises. It is the best that I can describe it.
I suspect a local radio ham or similar, so I fitted an RFI filter.
(Oh, Radio Frequency Interference" thing.)
It still farts. In bursts of 30 secs or so.
Charming !
Any ideas ?
Bob.

2007-01-16 08:19:36 · 3 answers · asked by Bob the Boat 6

We're supposed to make something that can catch an egg from about 20 feet in the air and the egg can't break. It's also supposed to be as light and small as possible. Any suggestions?

2007-01-16 08:15:27 · 7 answers · asked by Anonymous

Explain what happens when one bulb burns out in a circuit made up of six bulbs connected in series with one another?

2007-01-16 08:05:57 · 7 answers · asked by ♫ Saaskie ♫ 1

2007-01-16 07:57:30 · 5 answers · asked by STORMY K 3

Required Info: Atomic mass of carbon-14 =14.003242u
Atomic mass of nitrogen-14= 14.0037u

2007-01-16 07:50:56 · 2 answers · asked by DON 1

A shop sign weighs 201 N and is supported by a uniform 129 N beam of length =1.70 m. A guy wire is connected D=1.36 m from the backboard. The angle between the wall and the board = 39.2 degrees.

What is the tension in the guy wire?

What is the horizontal and vertical force exerted by the hinge on the beam?

I have drawn an FBD and used these three equations to solve this problem, but I keep getting the wrong answer.

W(center of mass of beam) times r(center of mass)= Tension (sin theta) times r (tension)

T (y direction) + force on wall = W (center of mass)

T (x direction) = T (on wall)

Are these the right equations? Am I doing this right? What should I plug in for the variables?

2007-01-16 07:50:47 · 5 answers · asked by Anonymous

2007-01-16 07:49:33 · 5 answers · asked by Anonymous

i dont want +ive or -ive charges i only need its exact definition.

2007-01-16 07:31:23 · 10 answers · asked by muhammad zahid m 1

yeh...er....i need like....LOADSA INFO! please do this and i will give you prase and love you forever and ever...:)

2007-01-16 07:19:19 · 4 answers · asked by Marianne C 1

A mathematically backed answer would be much appreciated! Please by all means use fourier to answer if you can.

Even an answer without mathematical backing would be appreciated.

2007-01-16 07:12:46 · 3 answers · asked by Matt 2

A rigid tank of small mass contains 55.0 g of argon, initially at 230°C and 100 kPa. The tank is placed into a reservoir at 0°C and is allowed to cool to thermal equilibrium. Calculate the following:

(a) The volume of the tank
**I found to be 57.59 L, which is correct. The rest is what I need help on...

(b) the change in internal energy of the argon
I know that the change in internal energy is equal to Q-W and thet W=Qhot-Qcold, but I'm not really sure what to plug in where to get this answer.

(c) the energy transferred by heat
Not even sure where to start with this...

(d) the change in entropy of the argon
I know that the change in entropy is equal to dQ/T and that
dQ = mcdT. I'm just really not sure what to use for what-- and what the change in temperature would be. Would the Argon cool to 0*C?

(e) the change in entropy of the constant-temperature bath

2007-01-16 07:11:59 · 1 answers · asked by flossie116 4

If we know that the rest mass of any particle is E = mc^2 then can somebody explain the following:

It was observed that a pion decays into a muon, and that their momentum was conserved. However their energy was NOT conserved. Thus it was hypothesized that there is another product of decay to conserve the energy. This new particle had to have zero mass for it to have no momentum - since momentum = MV. Thus they come up with the nuetrino to conserve the energy. However, since the nuetrino has no mass, how can it have energy? - Remember, E = mc^2 !! This has been puzzleing me for a while now!!! any help at all would be great.

2007-01-16 06:58:47 · 4 answers · asked by Anonymous

Calculate the change in entropy of 230 g of water heated slowly from 25.0°C to 90.0°C.

I'm assuming I'm supposed to use dQ = mcdT but I'm not really sure which numbers to plug in where. The m is the mass of .23 kg, and I think c was 4.186 J/Kg*C. What would the dT be though?

(I tried just subtracting them out and got a change of 65*). Then plugged that in to get a dQ of 62.5807.

And then do I use S = dQ/T like:

dQ/T(final) - dQ/T(initial) = change in entropy?

That got me a final answer of .037569 which was incorrect even when cutting it to significant figures Any help would be appreciated =)

2007-01-16 06:40:34 · 1 answers · asked by flossie116 4

The exhaust temperature of a Carnot heat engine is 330°C. What is the intake temperature if the efficiency of the engine is 27.0%?

The equation I have been using is:

efficiency = 1- (Tcold/Thot)
rearranging for:

Tcold = -Thot (efficiency-1)
Tcold = -603.15K (.27-1)
Tcold = 440.2995 K -273.15 = 167.1495* C

But I put that answer in and it says it's incorrect. Any help would be appreciated.

2007-01-16 06:30:44 · 2 answers · asked by flossie116 4

How much force is required to flip the dipole moment of a water molecule as it interacts with a charged surface (electrode) ? The potential gradient can be as high as 10^10 volts per meter at an electrode surface, this can easily orient water dipoles, but how can this be measured as a 'Force' that acts on the water as opposed to just an electrical field?

2007-01-16 06:26:50 · 3 answers · asked by scotter98 3

i have to write an essay about the creation of the universe for physics but i am quite confused... i have think about this all day but i just have no idea, please can you help???? becoz if he just created earth then WHO CREATED ALL THE OTHER PLANETS WITHOUT PEOPLE ON AND STUFF????????? and if he created the WHOLEEEE universe then WHY did he only put people on earth AND!!!! where was god before he created the universe?????

2007-01-16 06:15:01 · 17 answers · asked by Anonymous

which is the strongest or are they the equal? for instace adding equal amounts of water together 1ltr of 20 deg c to 1ltr of 40 deg c at a room temp of exactly 30 deg c what would would happen????

2007-01-16 06:14:53 · 5 answers · asked by johnis101 2

Once you create a neutrino, a tiny subatomic particle, it moves at nearly the speed of light, and it doesn't stop. It keeps going in a straight line to the edge of the universe.

2007-01-16 06:06:02 · 4 answers · asked by nghaktea Ralte 1

2007-01-16 05:45:33 · 17 answers · asked by tallat m 1

if it lands, why doesnt it land in another point from where it was hovering, because of the rotation of the earth?

2007-01-16 05:22:50 · 9 answers · asked by lallous_metal 1

this is assuming the earth isnt filled with magma.

2007-01-16 05:04:11 · 10 answers · asked by anubis135 1