Physics - March 2007

After a coin was accidently dropped on the floor, it is rolling around the circle R = 0.4m. The speed of the coin v = 1.00 m/s. What is the inclination angle of the coin to the vertical?

The coin is a thin uniform disk of radius r << R.
The force of friction is sufficient to keep the coin from slipping.
Ignore all enrgy losses, air, etc..

2007-03-14 07:54:38 · 4 answers · asked by Alexander 6

Afterall, they do carry alot of weight...

2007-03-14 07:39:49 · 9 answers · asked by EK13 Photos 2

Answer this question correctly first and get best answer!

2007-03-14 06:59:00 · 2 answers · asked by David S 2

(a) What is the magnetic energy density due to this field?

(b) What magnitude electric field would have an equal energy density?

Answer these correctly first, and get best answer!

2007-03-14 06:55:23 · 1 answers · asked by David S 2

A coil has an inductance of 0.35 H and a resistance of 35 . The coil is connected to a 6.0 V battery. After a long time elapses, the current in the coil is no longer changing.
(a) What is the current in the coil?
(b) What is the energy stored in the coil?
(c) What is the rate of energy dissipation in the coil?

Who ever answers these questions correctly first, gets best answer.

2007-03-14 06:53:41 · 2 answers · asked by David S 2

In Figure P20.63, the rolling axle, 1.50 m long, is pushed along horizontal rails at a constant speed v = 8.00 m/s. A resistor R = 0.402 is connected to the rails at points a and b, directly opposite each other. (The wheels make good electrical contact with the rails, so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R.) A uniform magnetic field B = 0.1200 T is directed vertically downwards.

Figure P20.63
http://www.webassign.net/sercp/p20-63.gif

(a) Find the induced current I in the resistor.
A
(b) What horizontal force is required to keep the axle rolling at constant speed?
N

2007-03-14 06:51:35 · 1 answers · asked by tiggerx313 1

A solenoid is made of 400.0 turns of wire, wrapped around a hollow cylinder of radius 3.8 cm and length 9.0 cm. What is the self-inductance of the solenoid?

2007-03-14 06:51:02 · 1 answers · asked by David S 2

A 24-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal surface. If μs = 0.5 and μk = 0.4, the frictional force on the block is:

2007-03-14 06:49:41 · 2 answers · asked by km1988 1

in, contained

2007-03-14 06:48:34 · 6 answers · asked by Anonymous

2007-03-14 06:08:27 · 5 answers · asked by anita c 1

2007-03-14 06:06:27 · 3 answers · asked by luc_bugeja 1

my laptop's battery has lost its ability to retain energy, and quickly discharges within mere 5-10 minutes. will it be safe to run it on my APC 500 VA UPS, since it can theoretically provide about 1 hour worth of running time to my laptop

2007-03-14 05:51:57 · 2 answers · asked by Rishabh Singla 2

what continent produces the largest percentage of their energy from nuclear power and on what continents are there nuclear power plants

2007-03-14 05:49:18 · 3 answers · asked by Orlando J 1

2007-03-14 05:46:56 · 3 answers · asked by jes_e_lou 1

a moving object, x has a mass, M, and speed, V.another moving object Y has twice the momentum of x.the mass and velocity of Y are...
A. 4 M, V
B. 4 M, V
C. 2 M, V
D. 2 M, 1/2 V

2007-03-14 05:38:56 · 9 answers · asked by xTzoX 1

2007-03-14 05:18:10 · 3 answers · asked by moos500 1

2007-03-14 05:03:18 · 6 answers · asked by fAtiN hAsEgAwA 1

2007-03-14 04:50:43 · 2 answers · asked by Lai Yu Zeng 4

what forward force must the ground apply to the foot of a 60.0 kg person to result in an acceleration of 1.00 m/s2?

2007-03-14 04:48:24 · 4 answers · asked by Ashlee 3

2007-03-14 04:26:38 · 4 answers · asked by banuyeniemek 1

2007-03-14 04:04:37 · 4 answers · asked by Anonymous

I apologise if this is a daft question but it would be nice to know given backround radiation is seen as proof for a big bang.

2007-03-14 04:04:07 · 4 answers · asked by Andrew H 2

2007-03-14 03:58:18 · 3 answers · asked by sophisticatedheart 1

I know this may sound weird or confusing to some, but what keeps the Laws of Physics consistent?

For example:
A light beam striking a flat surface is reflected off that surface at the same degree angle that it strikes the surface. What keeps that light beam in this definite path?

Similarly, one could use the analogy of a train on a track. The train follows the track exactly, it can not move anywhere outside of this track. So we know it is the track that keeps the train on its path.

Well, what keeps the light beam on its exact path? Must there not be some type of force that locks the light beam in its track?

2007-03-14 03:54:34 · 2 answers · asked by Anonymous

Controlling the power level of the submarine requires manual running of control rods. So instead, the reactor is made so that it will expand when it is hot and therefore decreases the rate of reaction and contracts when it cools which increases the rate of production of the power plant.

2007-03-14 03:54:08 · 2 answers · asked by jaw 2

Please help me visualise how a log of wood will look like after it is fed to a black hole. How far away from earth is the nearest blackhole and what is it's name [if anyone has cared to give it one].

2007-03-14 03:29:18 · 10 answers · asked by Anonymous

2007-03-14 03:04:59 · 7 answers · asked by Jaimee 1

2007-03-14 02:25:42 · 17 answers · asked by Anonymous

2007-03-14 02:18:17 · 3 answers · asked by Jaimee 1

2007-03-14 02:04:48 · 5 answers · asked by andrea april a 1