Physics - March 2007

a disk of mass m is rotating with "w'(constant)another disk of mass N of same radius is kept on the first disk if the contact surface are rough then fractional decrease in K.E will be ANS-N/m

2007-03-03 00:04:08 · 1 answers · asked by chotu 1

inclined plane is rough

2007-03-02 23:55:58 · 2 answers · asked by chotu 1

how does impurities affect time taken for ice to melt? will it be faster or slower? plz provide explanation. THANKS-

2007-03-02 23:05:11 · 4 answers · asked by Anonymous

2007-03-02 22:57:05 · 7 answers · asked by slimshady 1

2007-03-02 22:43:28 · 2 answers · asked by Sarah Mae A 1

I have a Peizoelectric sensor. it doesnt bear a manufacturer or supplier name nor does it bear and details pertaining to range, resolution, sensitivity etc... how do i know what force (input to sensor) gives what voltage (output from sensor). what components shud be used on the output side?? -- (like amplifier, conditioner, Voltmeter)

2007-03-02 22:14:40 · 3 answers · asked by Jawa Dude 1

2007-03-02 22:10:24 · 4 answers · asked by melbournewooferblue 4

How will I know (in a schematic diagram) if its a parallel or series circuit so that I can apply the right solution to it. I would like to think that in a parallel connection, loads are parallel to each other, and in a series they are non-parallel.

2007-03-02 21:58:18 · 8 answers · asked by p319 1

2007-03-02 21:51:51 · 5 answers · asked by Sarah Mae A 1

2007-03-02 21:49:49 · 1 answers · asked by Anonymous

Shouldn't a white sheet of paper taken outside look blue with all of that blue light out there?

2007-03-02 19:59:07 · 9 answers · asked by Anonymous

I live on the second floor of a three story apartment building. Each floor contains one apartment. My stereo is by my vent in the living room. Best friend said that sound travels downwards rather than upwards. Is this true? Thanks!

2007-03-02 19:45:37 · 5 answers · asked by Contessa 2

when a ray of light enters a glass slab from air,
what happens to it's frequency, wavelength and speed.
please explain to me with your right answer.

2007-03-02 19:19:54 · 10 answers · asked by krithika r 1

2007-03-02 19:06:51 · 1 answers · asked by elham g 1

A cyclist travels to work at an average speed of 3m/s and returns home for tea at an average speed of 9m/s. Calculate her average speed for the whole journey.(the answer is not 6m/s).

2007-03-02 19:00:10 · 7 answers · asked by jazmeen 2

2007-03-02 18:45:10 · 10 answers · asked by anoop bhargava 1

In an experiment with a gyroscope (similar to a spinning top) it was observed that it took a different amount of time to stop based on the direction of the spin. It is a revelation since current knowledge of physics and mathematics completely opposes this fact, so what does this mean for our future, how do u think it will enhance and change our current technology?

here's a detailed article of the experiment:

http://www.oswirus.krakow.pl/cat_14/gyroscope/

2007-03-02 18:07:30 · 6 answers · asked by Gist 4

well i have read that nuclear fission is the process of breaking up of a heavy nucleus into two or more lighter nuclei along with emission of elementary particles and energy
and
i have also read that nuclear fusion is the process by which two or more lighter nuclei fuse together to form a single nucleus with emission of elementary particles and energy.

now to my question.
Is it possible for nuclear fission and nuclear fusion to exist together???
i mean is it possible to make a reactor in which a heavy nucleus is first split into two or more lighter nuclei (by fission) with liberation of energy after which the two or more lighter nuclei can be fused to form the heavier nucleus again (by fusion) with liberation of some more energy after which fission comes again and so on???

note--these reactions (specially fusion) will take place only at very very high temperature..

2007-03-02 18:07:30 · 5 answers · asked by Anubhav~~!! 3

2007-03-02 17:26:53 · 5 answers · asked by damodharan c 1

2007-03-02 17:02:04 · 7 answers · asked by Anonymous

LOL

I swear to god. My calculator suddenly turn off.
i cant describe how i was at that time. i skip some of the calculation inorder to get my friend calculator once he done..

BUT.. suddenly my calculator work again??
isn't weird??..
I know that i have to expose the screen to a light to get it work but its a scientific once. Its will be really funny to search for a light across the class!

i just need to change the battery i guess??
Its Casio brand..

so.. can i changed the battery? and how? and where?

thaaaanks a lot

2007-03-02 16:55:39 · 4 answers · asked by Sara 1

A doubly charged helium atom, whose mass is 6.6 10-27 kg, is accelerated by a voltage of 2200 V.
(a) What will be its radius of curvature in a uniform 0.265 T field?
answer should be in cm
(b) What is its period of revolution?
answer should be in s

2007-03-02 16:01:36 · 1 answers · asked by ZG786 1

What does it REALLY mean? O_O Do you learn it in highschool?

2007-03-02 15:56:29 · 7 answers · asked by Anonymous

A rocket engine works becouse it sends particles moving very fast out of it and those particles push against particles in the atmosphere and propel the rocket forward, but in space there are no particles there is only a vacuum so what propels the rocket ??

2007-03-02 15:54:52 · 9 answers · asked by Gerard 1

This is a physics experiment of projectile motion. But I don't understand how does it works.
aim: To lob an unboiled egg from desktop height into a plastic cup on the floor.

Method: You are to tie up the egg with cotton to create a pendulum swinging over the surface of the table. The cotton strikeds a razor blade cutting the egg free. This then lobs over the edge into the cup!

That's many things I don't understand, how could cotton tied up on the egg? anyway I don't understand the whole thing...

2007-03-02 15:51:10 · 3 answers · asked by Only 2

2007-03-02 15:50:24 · 5 answers · asked by me2 3

A 2.5 kg body is at rest on a frictionless horizontal air track when a horizontal force F acting in the positive direction of an x axis along the track is applied to the body. A stroboscopic graph of the position of the body as it slides to the right is shown in Figure 7-26. The force F is applied to the body at t = 0, and the graph records the position of the body at 0.50 s intervals. How much work is done on the body by the applied force F between t = 0 and t = 1.0 s? (HINT: Find the average acceleration over t = 0 to t = 1.0 s.)

Here's my best attempt at drawing the graph.

http://i89.photobucket.com/albums/k239/blueray4/physicsprob.jpg

I thought this was so simple, but my answer is being rejected for some reason. Here's my work.

a= (.2m/s-0m/s)/1s=.2m/s^2

F=ma
F=2.5kg *.2m/s^2
F=.50N

W=F*d
W=.50N * .2m
W=.10J

what the heck? that should be right? or am I doing something stupid?

2007-03-02 15:09:46 · 1 answers · asked by Anonymous

My teacher probably told me, but I forgot. I know it's not 1, because the guy who sits behind me has about 1.3, and I know he's not as powerful as a horse.

2007-03-02 15:02:02 · 13 answers · asked by invincible 3

I have been studying sailplanes, and efficient movement. Now I was wondering how efficient land vehicles can move as compared to sailplanes. An efficient sailplane can glide at 60 mph on a slight 60 to 1 incline, which slight incline a bicycle likely could hardly coast on. That slight incline gives the glider thrust to both overcome head on air resistance and thrust to attain it's lift in mid air.

If any one can help with any of the below questions it would be much appreciated.

I was wondering how much incline or slope a loaded train with many cars would need to coast along at 60 mph. A train would likely need the least slope as it would have very little air resistance and has wheels that cause very little friction.

How much slope would a load semi need to coast at 60 mph?

How much slope would a typical car need to coast at 60 mph?

How much slope does the most efficient wheeled machine need to coast even at a slow rate?

2007-03-02 14:59:21 · 3 answers · asked by truthseeker 1

2007-03-02 14:48:48 · 2 answers · asked by Ann 1