Physics - February 2007

I notice this a lot while cooking. It seems really easy to heat up something all the way through on the stove, but if I want to cool or chill something that's hot (or even room temperature), it seems to take forever, even if I put it in the freezer.

Is it because of the laws of thermodynamics? Is it because the average freezer isn't as powerful as the average stove? Or is it something else altogether?

2007-02-12 05:29:05 · 5 answers · asked by Anonymous

2007-02-12 05:05:06 · 6 answers · asked by Anonymous

2007-02-12 04:57:12 · 3 answers · asked by Narissa J 2

2007-02-12 04:47:58 · 1 answers · asked by CRYSTAL J 1

the 'cosmological constant', that he had to use in the early 1920s. At that time the expanding universe wasn't known, so he had to invent this; he later retracted it when the expanding universe was known.

I'm looking for another theory, that was proven wrong by somebody esle.

2007-02-12 04:47:24 · 4 answers · asked by robert2020 6

23. If a person is in front of a smooth surface from which a sound is reflected, the person would hear a sound that

A. has a higher intensity than the sound produced by the source.
B. seems to come from behind the surface.
C. has a higher pitch than the sound produced by the source.
D. seems to lack overtones.


24. In a stringed musical instrument, the sound frequency of a particular string can be increased by

A. lengthening the string.
B. loosening the string.
C. tightening the string.
D. increasing the string\'s thickness.


25. Through which one of the following mediums is the velocity of a sound wave the greatest?

A. Steel
B. Lead
C. Water
D. Air

2007-02-12 04:44:13 · 1 answers · asked by tami c 1

2007-02-12 04:43:08 · 5 answers · asked by Eric Inri 6

Like a rock ,if we can convert it into its negative ,that rock have no weight and doesn't "fall into the ground again" (flying).

2007-02-12 04:37:00 · 5 answers · asked by isoggi 1

14. If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is

A. 0 degrees.
B. 40 degrees.
C. 80 degrees.
D. 90 degrees.


15. When a tuning fork vibrates over an open pipe and the air in the pipe starts to vibrate, the vibrations in the tube are caused by

A. harmonics.
B. reinforcement.
C. beats.
D. resonance.


16. When a sound from a source is refracted away from the surface of the earth, it gives an indication that the

A. air is cooler than the ground.
B. wind is blowing in the direction of the sound.
C. air has high humidity.
D. ground is cooling faster than the air.

2007-02-12 04:26:57 · 3 answers · asked by Anonymous

A bee is flying towards a road. Just as it crosses the road, a bus comes by at 50mph, and the bee splatters on the windshield.

However, another bee is flying towards the same road. Just as it is crossing the road the same bus passes by at 50mph. The bee flies into an open window on the bus.

What happens next - does the bee remain at the position it was in when it flew into the bus, and the bus continues moving, and the bee splatter against the back of the bus, or does something else happen?

Explain your answer.

2007-02-12 04:21:14 · 8 answers · asked by piperjoe68 3

2007-02-12 04:19:44 · 3 answers · asked by noevgo 1

the cotton does burn when it is rubbed on the copper. attracts rice and when the rice has fallen by itself the rice turns to dust. why does these things happen to some copper things and when?

2007-02-12 04:04:49 · 3 answers · asked by Bijay M 1

if the trailer was filled with half a tonne of birds, and they were all flying, would the truck and trailer weigh 5 tonnes or 5 and a half tonnes?

2007-02-12 04:02:22 · 18 answers · asked by Anonymous

2007-02-12 03:31:34 · 13 answers · asked by Chesh » 5

2007-02-12 03:25:45 · 12 answers · asked by george b 1

2007-02-12 03:21:24 · 27 answers · asked by heatherberlemont 1

2007-02-12 03:12:16 · 5 answers · asked by Anonymous

I've asked this before and appreciate the answers. However I don't want to calibrate the hours on the dial itself. I want to know if its possible that by adjusting the angle of both the gnomon and the horizontal dial itself to a given latitude, it would be possible to tell the approximate time of that latitude while being on a different latitide. Appreciate any feedback.

2007-02-12 03:04:06 · 1 answers · asked by yumbum 1

I kinda just told you in the question.

2007-02-12 02:48:06 · 2 answers · asked by prioroftheori 3

three forces, (-i + 4j)N, (2i - j)N and 3iN, i and j being vectors due east and due north resptively, act on a particle. find the magnitude and direction of the resulting force

2007-02-12 02:33:58 · 2 answers · asked by Ryujin 3

or an example of circuit maybe...

2007-02-12 02:16:11 · 2 answers · asked by Anonymous

I hope i get links to explain this with mathematical analysis

2007-02-12 02:14:52 · 1 answers · asked by san s 1

2007-02-12 01:45:36 · 5 answers · asked by einstien 2

If you can have any superpower, what could it be?

2007-02-12 01:41:18 · 9 answers · asked by Pedro 1

2007-02-12 01:39:18 · 2 answers · asked by Pedro 1

1.more then sped of light
2.at sped of light
3.less then sped of light
4.can't say

2007-02-12 01:10:40 · 18 answers · asked by Anonymous

Whats beyond cosmic rays, whats the longest EM wavelength possible?

2007-02-12 01:04:29 · 2 answers · asked by Anonymous

I mean right through to the other end of the planet, and somebody jumped down it, how long would they be falling DOWN the way before they were falling UP the way. Surely once you fell past the centre of the earth every thing would be the other way up due to gravity?

2007-02-12 01:04:04 · 12 answers · asked by Anonymous

2007-02-12 00:51:27 · 1 answers · asked by vanica m 1

Reality is the missing link when it comes to talking about creation, its certainly a complicated piece of physics to get your head round but unless we can prove what is real and what is not space travel to me seems doomed. Traveling long distances in space will rely on probabilities and quantem physics but do you and the scientist realise the importance of reality as a scientific tool

2007-02-12 00:14:59 · 9 answers · asked by Redmonk 6