Physics - May 2007

There is a ring which radius is R. A little ball moves inside this ring. Ring's flat is normal to the surface of ground. When a ball is moving inside a ring (ring is in quiet), the ball reaches a height which is equal to R/2.
The ring starts to move plumb with a fixed acceleration. What is the value of the fixed ring acceleration, if the ball inside the ring reaches the top of the ring?

2007-05-27 06:13:12 · 1 answers · asked by Pythagor 1

why is it in this shape? please include if you can a reliable source

2007-05-27 05:53:58 · 7 answers · asked by Anonymous

Please give me the link.

2007-05-27 05:43:20 · 5 answers · asked by Ken 1

2007-05-27 05:28:03 · 4 answers · asked by goring 6

and if its electrical then why isnt everything magnetic and why dont rubber conduct electric if its made of atoms

2007-05-27 05:05:41 · 10 answers · asked by Anonymous

please dont tell me it came out of something smaller than an atom cause i know this, i want to know who put that atom there.

2007-05-27 05:01:59 · 12 answers · asked by Anonymous

ok so we are all familiar with todays cast aluminum type grill well heres my question; my friend threw my grill in the garbage we had a fight and i didnt come get it in time now she is saying oh it was cracked anyways well it did fall over in a very very windy storm and i had picked it up and never noticed it to be cracked she said it was also im almost positive it fell to the grass she said it fell to the pavemant but even so do you think fromit falling on its side it would crack? it was cast alum so thats pretty hard to swallow

2007-05-27 04:19:38 · 2 answers · asked by Anonymous

My physics are told there is a time machine but it can transfer only atoms

2007-05-27 04:17:08 · 10 answers · asked by r s 3

discribe the 2 types of forces inside the nucleus of an atom. why are some nuclei unstable(i.e. radioactive)?

2007-05-27 03:40:58 · 4 answers · asked by Anonymous

2007-05-27 03:37:28 · 5 answers · asked by goring 6

i need someone who is very good in physic's and with whome i can talk 2.........share my view's ...........an university professor will be good i feel.........i can any one help me in dis regard.......

2007-05-27 02:32:49 · 2 answers · asked by Anonymous

why computers don't use static memory, is there a conspiracy?

2007-05-27 02:30:14 · 3 answers · asked by rastgoo_2 2

in an ac circuit, the average velocity of the electrons is:
a) a fraction of a centimetre per second
b)a few metres per second
c)3/4 the speed of light
d)the speed of light
e) zero metres/sec

2007-05-27 01:12:12 · 2 answers · asked by Anonymous

This is one of the questions in a practice exam paper i will be sitting next week, so I'd really appreciate any help-im a little worried at the moment!

The circuit in question has a power supply, a thermistor and a fixed resistor in series. There is also a voltmeter attached in parallel to the fixed resistor - that is the voltmeter the question is referring to.

Thanks for helping out,

2007-05-27 00:14:44 · 5 answers · asked by Anonymous

Thanks:)

2007-05-27 00:08:29 · 4 answers · asked by tut_einstein 2

I need to have a description in detail .

2007-05-26 22:57:17 · 1 answers · asked by idealstudent 1

2007-05-26 21:59:44 · 5 answers · asked by micky007 1

I want to be a theoretical physicist but how and how much do they get paid?

2007-05-26 21:35:06 · 7 answers · asked by worried person 1

My mom is playing cds on the stereo and she's raised the volume to an extremely very high level. It's so loud that the floorboards of the second floor is shaking. I mean, I'm sitting on top of my bed right now and *it* is even also vibrating! Isn't that bad? I'm not very good in Physics but I think we discussed something like this in class before.

2007-05-26 21:10:24 · 5 answers · asked by lessthan3ron 2

2007-05-26 20:53:37 · 5 answers · asked by cedriccation 2

2007-05-26 20:48:22 · 3 answers · asked by Anonymous

2007-05-26 20:38:07 · 15 answers · asked by sam 1

please help figure it for me.

2007-05-26 19:59:21 · 1 answers · asked by fine boy 1

2007-05-26 18:13:05 · 5 answers · asked by ruchimehrotradutta 1

Definition and conversion factors for centipoise

2007-05-26 17:25:14 · 2 answers · asked by Soo 1

2007-05-26 16:17:31 · 5 answers · asked by Anonymous

I need some aerodynamics, because my car gets "light" at high speeds. Instead of adding a wing and splitters, would it be feasible to add equal weights to each corner of the car?

2007-05-26 16:14:10 · 5 answers · asked by Anonymous

Length of simple pendulum = 0.760 m
Pendulum bob = 0.365 kg
Theta = 12.0 degrees
a) Find the frequency (Don't bother with this part)
b) What is the pendulum bob's speed when it passes thru the lowest point of the swing? (equilibrium)
c) What is the total energy stored in this oscillation, assuming no loss? (use answer from #2)
**assume simple harmonic motion for all questions

-For part 2, I've tried 3 different approaches, and I don't know which is correct:
1) centripetal force
mv^2/r = Tension- mg...but how to find tension?
2) definition of v:
v = x/t
x = 2* L * theta
1/t = frequency
v = 2*l*theta*frequency (this is what I think works)
3) Find total energy first; Total energy = (1/2)kA^2
k = mg/L for a simple pendulum
A = L * theta
So, the total energy is: (1/2)(mg/L)(L*theta)^2
Then, this amount equals (1/2)mv^2
so solve for v:
root((g)(theta)^2*L) = v
So, my best tries are:
v = root(gL*theta^2)
v = 2L*theta *frequency
which is correct?

2007-05-26 15:54:29 · 2 answers · asked by J Z 4

Are the photons different somehow? Are the waves or particles different?

2007-05-26 15:43:56 · 4 answers · asked by sassychickensuckerboy 4

B/c hurricains r made w/ cold, heat, and a little wind.

A-bomb- heat
Antartica- cold, and wind
Combined- Hurricane

2007-05-26 15:18:13 · 7 answers · asked by Chess man 1