Physics - November 2006

A large turntable rotates about a fixed vertical axis, making one revolution in a time of T. The moment of inertia of the turntable about this axis is I. A child with a mass of m, initially standing at the center of the turntable, runs out along a radius.

What is the angular speed of the turntable when the child is a distance of R from the center? (Assume that you can treat the child as a particle.)

2006-11-19 07:38:42 · 1 answers · asked by Phys 1

I can't seem to find an equation to relate the variables. I calculated E = 1.76*10^-5 W/m^2 from the Stefan-Boltzmann Relationship, and I calculated my A = 2.12 m^2 and my T = 313.15 K, but I don't know how to come up with a rate of cooling. Any ideas?

Thanks! :-)

2006-11-19 07:38:27 · 1 answers · asked by JoeSchmo5819 4

2006-11-19 07:22:42 · 6 answers · asked by 8 3

This picture may help explain it.

*Picture link:
http://img161.imageshack.us/img161/6600/scan0002nc0.jpg

2006-11-19 07:17:38 · 3 answers · asked by swimmertommy 1

Have any of you built it? I have heard that the best release point is 45 degrees. Is that true? It needs to throw a marble 6 meters. What type of device is best to throw the marble? Need quick advice. Thanks!

2006-11-19 06:59:05 · 2 answers · asked by ry 1

i need help on homework!
Light can travel through a _________, __________, some ______, and a __________.

Plez Help!!

2006-11-19 06:51:14 · 3 answers · asked by Anonymous

An object of mass m is traveling on a horizontal surface. There is a coefficient of kinetic friction (mu) between the object and the surface. The object has speed v when it reaches x=0 and encounters a spring. The object compresses the spring, stops, and then recoils and travels in the opposite direction. When the object reaches x=0 on its return trip, it stops.

Find k , the spring constant.
Express k in terms of (mu),m ,g , and v.

2006-11-19 06:48:58 · 1 answers · asked by ahmad g 1

This is one question.. A sled weighing 60.0 N is pulled horizontally across snow so that the coefficient of kinetic friction between the sled and the snow is .100. A penguin weighing 70.0 N rides on the sled. If the coefficient of static friction between the penguin and the sled is .700, find the maximum horizontal force that can be exerted on the sled before the penguin begins to slide off.

2006-11-19 06:42:55 · 1 answers · asked by coolguy0603 1

Give the names, not just letters.

2006-11-19 06:41:33 · 3 answers · asked by Becky 2

Has anyone had to build a mousetrap powered catapult for school. i need to build and i was wondering if anyone had any suggestions on how they built there's to succeed. i need to be able to throw a marble for a minimum of 6 meters. thanks for your help.

2006-11-19 06:38:36 · 2 answers · asked by ry 1

According to special relativity, if something could move faster than the speed of light, and that thing triggers another event, it's possible that the event would happen before the cause... my question is, why? It's just something I've never understood and it gets me frustrated!

2006-11-19 06:35:52 · 3 answers · asked by andrew w 1

2006-11-19 05:43:38 · 13 answers · asked by briancousins@btinternet.com 1

2006-11-19 05:36:45 · 4 answers · asked by briancousins@btinternet.com 1

....

2006-11-19 05:34:16 · 3 answers · asked by Anonymous

2006-11-19 05:17:01 · 6 answers · asked by Rada L 1

Is that Uniform motion or non uniform motion?

2006-11-19 05:11:27 · 5 answers · asked by goring 6

2006-11-19 05:04:52 · 5 answers · asked by snowdropz_17 1

Electron of specific energy state in atom is having different angular momentum to each other to fulfil exclussion principle and depicts the shape of the orbit. But if angular momentum differs how about the energy of state. If "l" value is 0 is that means angular momentum is zero. please answer.

2006-11-19 04:57:43 · 6 answers · asked by haris 1

im traveling at 27 miles per hour.. if i lose my frankfurter, and have to go back 2 miles and look for 10 minutes... how long will it take me to travel 20 miles??

2006-11-19 04:48:12 · 4 answers · asked by bigschwinger 2

2006-11-19 04:47:24 · 2 answers · asked by goring 6

2006-11-19 04:47:07 · 5 answers · asked by jonas_tripps_79 2

Is it related to impetus?

2006-11-19 04:44:32 · 5 answers · asked by goring 6

2006-11-19 04:12:36 · 13 answers · asked by Anonymous

if we have 27, five-hundred pound men, streaking around a .7 mile track... how long will it take these large men to streak 10 miles if they are streaking at 45 miles per hour??

this is given, as a large bus suddenly drives near the track, and makes these large men stop to moon this bus..... the men are mooning the bus for 5 minutes.. so the question is, what is the average speed of this bus after 10 miles???

2006-11-19 04:09:21 · 2 answers · asked by bigschwinger 2

Newton's first law

2006-11-19 04:07:31 · 4 answers · asked by goring 6

2006-11-19 03:45:33 · 5 answers · asked by ajay s 1

I need serious help with physics! What exactly is the berkley's osmometer? And what was Hartley's contribution to it? I know it deals with applying pressure to vary osmosis..but how does it work?

2006-11-19 03:37:50 · 1 answers · asked by Anonymous

skates, at rest and facing each other, with a compressed spring between them. The spring is kept from pushing them apart, because they are holding each other. When they release their arms, Al moves off in one direction at a speed of 0.910 m/s, while Jo moves off in the opposite direction at a speed of 0.829 m/s. Assuming that friction is negligible, find Al's mass

2006-11-19 03:15:53 · 4 answers · asked by meggers 3

i am cooking 47 frankfurters in my oven, each frankfurter weighs .5 pounds each... if a four-hundred pound man reaches into the oven and eats 6 frankfurters, what is the poundage of the frankfurters left??? and why would he do this?? this is both mathmatical and philisophical...

2006-11-19 03:08:46 · 4 answers · asked by bigschwinger 2

2006-11-19 02:54:39 · 6 answers · asked by brainysouthpaw 1