Physics - July 2007

2007-07-17 03:30:16 · 7 answers · asked by christian h 1

2007-07-17 03:18:44 · 12 answers · asked by Anonymous

A student shakes out twenty waves on a slinky in 10 seconds. What is the frequency of the waves?

2007-07-17 01:38:06 · 2 answers · asked by Anonymous

If the earth's heat relies on transfer to outer space and that being a vacuum and the ozone layer prevents heat transfer could ozone be scientifically produced?

2007-07-17 00:57:20 · 6 answers · asked by james h 2

...what is light?

2007-07-17 00:05:55 · 19 answers · asked by Lola 2

2007-07-16 22:57:23 · 9 answers · asked by suyog 1

(you know pretend like it could happen)

you dig it then jump in it
you fall all the way to the other side of the earth
when you get to the other side of the earth
would just fall back to the spot you started?
and so on...

i was thinkin about this today

2007-07-16 21:54:50 · 10 answers · asked by Anonymous

Is it simply called Plate Tectonics??

Please help!!

2007-07-16 20:26:30 · 4 answers · asked by Anonymous

QUESTION ONE:

Is there any way the two individual frequencies can be combined to give the same beat frequency previously measured?

QUESTION TWO:

There are commercial products available called active noise cancellers, which consist of a set of headphones, microphones, and some electronics. Intended for wearing in noisy environments where the user must still be able to hear (for example, radio communications), the headphones reduce noise far beyond the simple acoustic isolation of the headphones. How does such a product work?

You don't have to answer both, but whatever you can help with is greatly appreciated (I will choose best answer).

Thanks everyone!

2007-07-16 20:05:54 · 3 answers · asked by Mark 1

A small plastic ball (similar to a ping-pong ball) with mass 2.5g is attached by a thread to the bottom of a beaker. When the beaker is filled with water so that the ball is totally submerged, the tension in the thread is 0.03N. The density of water is 1000kg/m^3 and the acceleration of gravity is 9.81m/s^2.
Determine the diameter of the ball.

2007-07-16 19:49:49 · 3 answers · asked by Doodle 2

2007-07-16 19:30:52 · 6 answers · asked by ABHISHEK M 2

Since radio waves and light waves are on the same spectrum. Could you create a laser or beam of radio waves? Would this be able to broadcast more information or transport more power?

2007-07-16 19:03:16 · 3 answers · asked by Anonymous

suppose there are 2 watches kept ..........one above the 5 metre self and the 2nd one above 15 metres... .............we would observe that the 2nd watch would move faster than the first one by micro or miliseconds? plz try it..............its an un belivable truth???????????and try to ans this ,,,,,,,,,,,,,,,,,,it has something to do with the gravitational force?

2007-07-16 17:18:25 · 2 answers · asked by aditya g 1

A 1.50 g lead bullet at 30.0°C is fired at a speed of 260 m/s into a large block of ice at 0°C, in which it embeds itself. What quantity of ice melts?

2007-07-16 16:17:07 · 1 answers · asked by protege moi 3

velocity

2007-07-16 15:47:32 · 4 answers · asked by Anonymous

A 400 g block of copper at a temperature of 75°C is dropped into 750 g of water at 23°C. The water is contained in a 100 g glass container. What is the final temperature of the mixture?

2007-07-16 15:28:07 · 1 answers · asked by makk 3

2007-07-16 15:25:53 · 3 answers · asked by Brilliant Queen (BQ)_forever !!! 5

1- a cannon launches a cannonball horiziontally off a cliff that is 25.4 meters high. If the cannonball is fired with a velocity of 28.3 meters per second, how far from the edge of the cilff will the ball land?
2- a stone is dropped from a cliff to the stream below. It takes 6.28 seconds for the stone to hit the water. A- How fast in meters per seconds is the stone traveling when it hits the water? B- How high in meters if the cliff above the stream?
3- a penny is dropped from a 700 ft. high bridge. A-How long does it take for the penny to reach the ground below? B- What is the velocity of the penny upon impact?
4- it takes 4.20 seconds for a ball that was thrown down from the top of a building to reach the sidewalk below. The balls velocity upon striking the sidewalk is 148 miles per hour. A- How tall is the building? B- what is the initial velocity of the ball?

2007-07-16 13:35:57 · 2 answers · asked by Anonymous

physics - kinetic energy

A bicycle and a rider together have a mass of 7.40 slugs. If the kinetic energy is 742 ft lb, find the velocity (ft/s).



I've been trying to do this problem all day!! And I still can't get the right answer!!

2007-07-16 12:37:14 · 2 answers · asked by Anonymous

2007-07-16 11:04:54 · 11 answers · asked by Jennifer N 1

2007-07-16 08:13:55 · 3 answers · asked by John S2005 3

If it's the current through the body that determines how serious a shock will be, why do we see warnings of "high voltage" rather than "high current" near electrical equipment?

2007-07-16 08:12:52 · 11 answers · asked by soniye88 5

Why does really hot water sound muffled or "padded" when it is being poured into a glass while cold water sounds crisp and clear when being poured into a glass?

2007-07-16 08:01:57 · 1 answers · asked by preston 2

herd of it and want it

2007-07-16 07:57:37 · 9 answers · asked by Anonymous

2007-07-16 07:53:12 · 3 answers · asked by Adeel 2

How would you explain something like that?
A question for trekkies or real scientists?

2007-07-16 07:52:04 · 2 answers · asked by Anonymous

will the piston push the bullet with quadruple force and quadruple muzzle velocity?

2007-07-16 07:42:41 · 4 answers · asked by Alexander 6

2007-07-16 07:30:21 · 4 answers · asked by jmagic 1

2007-07-16 07:15:06 · 2 answers · asked by abc 1

Reason I ask for the 3 different types is I understand that RF has skin effect. But if Ac and Dc is same why is it we need such heavy cables? And not simply a weaved cable over a much cheaper core.

2007-07-16 06:25:55 · 3 answers · asked by Anonymous