Physics - June 2007

A 0.00676-kg bullet is fired straight up at a falling wooden block that has a mass of 1.04 kg. The bullet has a speed of 863 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision with the bullet occurs. As a result of the collision, the block (with the bullet in it) reverses direction, rises, and comes to a momentary halt at the top of the building. Find the time t.

2007-06-24 05:28:22 · 3 answers · asked by Anonymous

I have completed (10 + 2) in 2005 and I am in 3rd year of aircraft maintainance engineering course ( 3 years diploma course)

2007-06-24 05:27:43 · 4 answers · asked by shiladitya ghosh 1

In my syllabus I am told to appreciate that the quality of the note from the stringed instrument depends on the relative intensity of the modes of vibration.

Could someone please explain this to me in English.

2007-06-24 05:20:43 · 1 answers · asked by Anonymous

I got 2 magnets, north pole of one faces the south pole of another

Now of course in this case the magnetic lines of forces will move from the north to the south.

Now i put a magnet shielding sheet in between these 2 poles....will the magnetic lines of forces meet the 2 poles finding a path away from the shield....i mean will the lines carve a way through this shield....or in other words, will the lines first move away from the shield and then continue into the other pole.

tell me if u don't get the question

2007-06-24 04:49:29 · 2 answers · asked by Anonymous

This rule seems to work for paper and clothes too.

2007-06-24 04:34:16 · 3 answers · asked by City Girl 1

2007-06-24 04:33:07 · 4 answers · asked by Anonymous

So since the big bang there has been loads of backround radiation in the universe, and over time it has been from gamma radiation, through the electromagnnetic spectrum and out to microwaves.

But, will it ever turn into radiowaves, and if it does tommorrow, will we ever be able to use radio's or TV's?

2007-06-24 03:45:36 · 9 answers · asked by Anonymous

2007-06-24 03:12:51 · 4 answers · asked by Anonymous

Are mathematical models describing physical phenomena, the same thing as mathematical equations describing physical phenomena. Are the terms model and equation just different names for the same thing or do they describe different things.

2007-06-24 02:46:02 · 4 answers · asked by ABC X 2

If a photon has a mass of 0, then how could matter (a so dense form of energy, Energy=Rest Mass X Celeritas Squared) have mass? And if its mass is about zero and not zero, then how does it travel in celeritas? And why don't I feel I carry heavy things in day although photons move in celeritas (have infinity as mass)? Give scietific clues and examples please.

Now, about the General Relativity. Why does mass cause curve in space-time contiuum while there is not gravity to pull it down? Is it that its high content of energy pushes space-time contiuum with enough force to force it to curve?

2007-06-24 01:34:59 · 8 answers · asked by Palestini Detective 4

2007-06-23 23:55:56 · 1 answers · asked by Henry S 1

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2007-06-23 23:31:29 · 2 answers · asked by tubscouk 2

I know the fundamental science behind a black hole, but I'm not sure what would happen in the above condition. This is a purely theoretical question, so don't bother pedantically pointing out that this could never happen because... or that black holes are permanent because... I'm not interested in that sort of answer. I'd like to hear what you think the outcome of the above condition would be. Destruction of Earth? Destruction of the solar system? Destruction of my road? What would happen to light and matter particles trapped and permanently falling on the event horizon once the hole winked out of existence? Would they be released? If so, what would be the nature of that release?

2007-06-23 22:48:41 · 15 answers · asked by wyntersfell 1

2007-06-23 22:05:03 · 8 answers · asked by nonothing 1

2007-06-23 21:57:08 · 6 answers · asked by AKL 3

1. A can is 40 cm long, 30 cm wide, and 45 m high. If the density of matter is 1g/cm³, what is the mass of water inside the can in kilogram?
2. Show how a speed of 40 kilometers per hr. can be converted to meter per second.
3. A supersonic aircraft has a speed of 2,200 milesper hour. Find each speed in meter per second.

Please explain answers.

2007-06-23 21:55:58 · 5 answers · asked by christine b 1

answer briefly please..

2007-06-23 21:37:08 · 3 answers · asked by prettyLT 1

i thought i heard a noise on my street just now so i looked then i saw a orb of light blue pink on the street float in air real fast no lights were on outside or inside. what was IT?

2007-06-23 21:16:00 · 10 answers · asked by Mi 3

2007-06-23 20:49:51 · 7 answers · asked by deepak_hellboy 1

the spring in a clothes pin is compressed 0.40 cm, storing energy in the form of spring potential evergy. if the spring is compressed twice as far, the spring potential energy increases by 0.0046 J. what is the force constant, k, for this spring?


this would really help if u could show the work. ....please!!!!???!!!

2007-06-23 20:29:57 · 5 answers · asked by spaceranger2010 2

Did Jehova create the Universe? And how? Could Jehova be the first human being on earth so he created life or humans or living things on earth? If he created the Universe then what planet or what place he started from? Or maybe Jehova was a smart man so he created life on earth like humans, animals or plants. Could Jehova have many ancestors?

2007-06-23 20:23:03 · 4 answers · asked by Anonymous

Where are those laser weaponry.

2007-06-23 20:21:28 · 3 answers · asked by Anonymous

an ice cube is placed in a micro. suppose the micro delivers 105 w of power to the ice cube and that it takes 32,200 J to melt it. how long does it take for the ice cube to melt?

2007-06-23 20:03:41 · 2 answers · asked by spaceranger2010 2

According to the particle theory, particles in solid objects are more closely packed than particles in a liquid. Then why does water, in its solid state as ice take up more mass than water in its liquid state? Just a curiosity thing.

2007-06-23 19:32:18 · 14 answers · asked by Anonymous

they kind of sort of sound....... exactly the same. lol

2007-06-23 18:39:49 · 3 answers · asked by Anonymous

2007-06-23 17:27:03 · 3 answers · asked by Maxine 3

A boat full with pieces of heavy rock is floating on the surface of water in a pool. When the pieces are thrown into water, what would happen with the level of water in the pool? Give the arguments in support of your point of view.

2007-06-23 16:06:41 · 5 answers · asked by zubair y 1

A helium atom (mass 4.0 u) moving at 601 m/s to the right collides with an oxygen molecule (mass 32 u) moving in the same direction at 402 m/s. After the collision, the oxygen molecule moves at 446 m/s to the right. What is the velocity of the helium atom after the collision?

2007-06-23 15:38:42 · 2 answers · asked by salvnjc4ever 1

2007-06-23 15:01:09 · 6 answers · asked by The Angry Stick Man 6

At a given instant, the blood pressure in the heart is 1.6*10^4 Pa. If an artery in the brain is 0.45m above the heart, what is the pressure in the artery? Ignore any pressure changes due to blood flow.

2007-06-23 15:00:11 · 3 answers · asked by chly1459 1