Physics - October 2006

A long horizontal rod has a beed which can slide along its length and initially placed at a distance L from one end A of rod. The rod is set in angular motion about A with constant angular acceleration 'a'.If the coefficient of friction between the rod and the beed is 'u' and gravity is neglected, then the time after which the beed starts slipping is
(A) sq rt.(u/a) (B)u/a (C)u/sq.rt(a) (D) infinitesimal.

2006-10-25 04:49:55 · 1 answers · asked by Anonymous

Okay so heres a little riddle type thing. I let you have a go and i'll post up the answer later. enjoy!

Say for this test only, you could make an object move 90% the speed of light (0.9c) in a laboratory. And your lab is a high/wide/long as you want.

The only equipment you may have includes:
- the object (ie stick/ball/book etc) whose max speed can reach 0.9c in this test
- a 4 walled room (of your choice of size)
- a light source ( ie lamp)

How can you make SOMETHING ELSE move faster than the speed of light by moving only the object?

Good luck!
Description with answers please!

2006-10-25 04:37:40 · 5 answers · asked by benabean87 2

why is a pump an open fluid system?

2006-10-25 04:09:16 · 2 answers · asked by Anonymous

A wheel 33 cm in diameter accelerates uniformly from 240 rpm to 360 rpm in 6.5 s. How far will a point on the edge of the wheel have traveled in this time, and how do you formulate the calculations?

2006-10-25 03:53:40 · 1 answers · asked by Pat M 1

A child rolls a ball on a level floor 3.5 meters to another child. If the ball makes 15.0 revolations, what is the balls diameter and how do you show the calculations.

2006-10-25 03:50:33 · 9 answers · asked by Pat M 1

when a fluid does positive work in a closed system and the pressure is constan, does the voulme of the fluid increase or decrease?

2006-10-25 03:50:05 · 1 answers · asked by Chris D 1

With projectile motion, my teacher has switched from positive 9.8 to negative..But then when..
A golf ball rolls off a horizontal cliff with an initial velocity of 11.4m/s. The ball falls a vertical distance of 15.5M into a lake below. (a) How much time does the ball spend in the air? (b) What's the velocity of the ball just before it strikes the water?

Using Final Velocity=Square root[Initial velocity squared+2acceleration*displacement..

He uses positive 9.8...

2006-10-25 03:47:32 · 4 answers · asked by pugfug90 2

2006-10-25 03:46:46 · 11 answers · asked by J C 3

The covariant derivative being the curly "d" with a low "mu" beside it. And is the covariant a row or column vector? And so is the adjoint the opposite?

2006-10-25 03:46:42 · 2 answers · asked by CorneliusMurphy 2

A spring gun (k = 25 N/m) is used to shoot a 56 g ball horizontally. Initially the spring is compressed by 16 cm. The ball loses contact with the spring and leaves the gun when the spring is still compressed by 12 cm. What is the speed of the ball when it hits the ground, 1.3 m below the spring gun?

2006-10-25 03:24:59 · 4 answers · asked by David S 2

2006-10-25 03:22:22 · 7 answers · asked by Anonymous

2006-10-25 03:21:48 · 4 answers · asked by sumitra_40 1

In a roomm with air at 20 deg. celcius, two cups are placed containing equal amounts of coffee but at 85 deg. celcius and 45 deg celius respectively. Coffee in the first cup cools down to 75 deg. celcius in 2 minutes. How long it will take for the coffee in the second cup to cool down to 35 deg. celcius.

2006-10-25 02:34:01 · 4 answers · asked by vijay kumar98724 1

A wall of 0.5m thickness is to be constructed from a material which has an average thermal conductivity of 1.4W/m-K. This wall is to be insulated from outside with a material having an average thermal conductivity of 0.35W/m-K so that the heat loss per square meter will not exceed 1450W.Assuming that the inner & outer temperatures are 1200 deg.celcius and 15 deg. celcius respectively, calculate the thickness of insulation required.Also find the temperature of the wall-insulation interface.

2006-10-25 02:26:26 · 2 answers · asked by vijay kumar98724 1

It still obtains nowadays, to interpletar in the difrentes types of nebulas of the Interstellar System, with mirage of other Galaxias, By Lactea, black Hole, Hole of earthworm, and as much other demagogy astronomicas, only with caoticas interpretations.

2006-10-25 02:03:02 · 2 answers · asked by britotarcisio 6

Always a good one to ask at a dinner party but I've never heard a good answer although displacing water often comes up; but isn't this volume . . .

2006-10-25 01:52:26 · 12 answers · asked by Ray 1

2006-10-25 01:43:58 · 4 answers · asked by Anonymous

I am the atom great “Universe”, I divide myself in three forces: Prótons, Elétrons and Nêutrons. To the Prótons it is the positive power, but with the negative return, and to electrons it is the negative power, but with the positive return. In what it says respect to the Nêutrons is the responsibility to act the end to unbalance the positive forces or the negative in its related limits. Thus it neutralizes the start and the extremity of all the sources of being able of the universe (mainly the sun, the planets and the Interstellar system). The energies that come of the place for where to go, and go for the place of where they come.

2006-10-25 01:37:07 · 1 answers · asked by britotarcisio 6

To speak on the cientifica nature of the Interstellar System, and to argue questions as, the nebulas I contend billions of stars representing clouds and electron-stars (or better, saying: plasmáticos crystals). It is necessary to leave well clearly that in these regions the set of the biggest substance distributed in the “Universe” exists. E how much to the theories created for the astrophysical astronomers and, who still nowadays interpret the Sun as stars, some factors indicate that they had been and still they are deluded by the nuclear physics that has as autonomy, to satisfy its research as rules of the atomic nucleus that has its intent energies. With this false interpretation the astrophysical astronomers and, ignore the different types of clouds electron-stars with theories that satisfy its requirements. Example of the names: Galaxies, quasares, By Láctea, nebula of Andrômeda, supernew, misty spirals etc, etc, etc.

2006-10-25 01:34:29 · 3 answers · asked by britotarcisio 6

Big Birds maiden flight.

2006-10-25 01:29:25 · 22 answers · asked by joe k 2

2006-10-25 01:25:52 · 5 answers · asked by Anonymous

2006-10-25 01:25:34 · 1 answers · asked by Anonymous

What is the the best RPM to machine an aluminum casting that will not cause expansion in the casting?
The casting has powder coating on one side and needs to be machined for a bearing in the back /center. Using a Mori Seiki 1500 with Fanuc controls.

2006-10-25 00:56:44 · 2 answers · asked by rswdew 5

2006-10-25 00:48:51 · 10 answers · asked by Anonymous

Who will finish the course first?
Pls my Homework must be done on friday!
i'm not good at this!!!!!!

2006-10-25 00:29:26 · 3 answers · asked by Anonymous

Plz Help Me!

2006-10-25 00:24:41 · 5 answers · asked by Anonymous

in terms of kinetic theory of gases

2006-10-25 00:23:20 · 5 answers · asked by Anonymous

2006-10-25 00:01:13 · 5 answers · asked by MN S 1

2006-10-24 23:57:56 · 4 answers · asked by MN S 1

2006-10-24 23:23:23 · 3 answers · asked by kp_thu 1