Physics - January 2007

if light has no mass and is a form of energy how can gravity have any effect on it for instance how can a black hole have enough gravity to capture light this means that light has a mass because u cant pull something that has no mass right???

2007-01-26 13:22:21 · 4 answers · asked by Anonymous

self explaintry

2007-01-26 13:12:56 · 4 answers · asked by Anonymous

The coconut tree is tall and at its apex is the coconut. It grows near slat water basins and yet the water within is sweet. In he first place, how does water get into the coconut so substabtially without a pump?

2007-01-26 12:55:27 · 8 answers · asked by callbosco 1

The problem states that a school bus pulls into an intersection as a car approaches at 25 km/h on an icy street. as the car's driver sees the bus 26 m away, he slams on the brakes and since the car does not have anti-lock breaks, it slides towards the intersection. I am given a co-efficient of kinetic friction that equals 0.10 and I am asked if the car hits the bus. The answer key states that the car stops after traveling 24.6 m and does not hit the bus, but without the car's mass or weight, I am not sure how to proceed. Is there something that I am missing?

2007-01-26 12:36:00 · 2 answers · asked by mksbema 1

So it says:

A solid piece of leadc has a mass of 23.94 g and a volume of 2.10 cm^3. From these data, calculate the density of lead in SI units (kg/m^3).

So I converted g into kg getting .02394 kg and 2.10 cm^3 into m^3 getting .0210 m^3......

And I divide .02394 kg by .0210 m^3 and get 1.14 kg/m^3...

But the answer in the back of the book is 11.4 x 10^3 kg/m^3.

What am I doing wrong?

2007-01-26 12:34:21 · 2 answers · asked by Anonymous

I am interested to know if electrons have been proven beyond a shadow of doubt to be identical through observation or is it solely a theoretical/mathematical assumption.

2007-01-26 12:29:59 · 7 answers · asked by Anonymous

I am a science student, but not in physics, and would like to have a more solid understanding of quantum mechanics. Is there a book that is simple enough for laymen to understand?

2007-01-26 12:07:32 · 4 answers · asked by lb 3

Someone I know told me that string theory was disproven. I doubt this but I am not really sure. He said it was disproven only a few months ago. Does anyone know the truth about this matter?

2007-01-26 12:03:24 · 11 answers · asked by Anonymous

There are so many sources of radio waves in the air constantly.

2007-01-26 11:51:16 · 4 answers · asked by bluh 2

Someone please explain this to me.

When we were studying about the Big bang theory in astronomy a couple months ago, I didn't quite get this: How could the universe and everything in it expand from a small mass of whatever? (Sorry I don't remember much, hence me asking this question.) Yes, I am Christian, and I understand that my faith affects how I believe on this topic. But I am seriously wanting to know. I mean, what *caused* this mass to expand?

I would appreciate serious answers and I am not trying to start a big huge debate here. thanks.

2007-01-26 11:43:40 · 4 answers · asked by grav♫ 2

What properties whould something have to have, in order be not affected by gravity? Or how can we better understand gravity in order to munipulate it.???

2007-01-26 11:28:38 · 8 answers · asked by Buck BUCK 2

A curve of 220m radius is banked at 18 degrees. At what speed must an automobile go around this curve if no frictional forces are to be used to keep the automobile on its circular path?

Please help me set up the problem. I need the formula, not the answer.

2007-01-26 11:16:34 · 4 answers · asked by Suedoenimm 3

i think i already know that the answer is NO, but why not. why can't we make an electron gun or laser that just shoots electrons in a straight line over large distances with no medium?

2007-01-26 10:57:50 · 5 answers · asked by JizZ E. Jizzy 2

ummm not too sure maybe someone can share some info on the subject.

2007-01-26 10:51:37 · 4 answers · asked by fretnoise21 1

2007-01-26 10:46:20 · 4 answers · asked by Anonymous

2007-01-26 10:38:42 · 5 answers · asked by Anonymous

2007-01-26 10:17:43 · 4 answers · asked by comedycatalyst 2

I understand that if you measure time at one point from a high altitude and compare it to the time directly below sea level you would result in different times. This is obvious as the distance of circumference at each point are different as it travels around earth. Is there a better real-world example of how gravity can distort universal space and time and not space and time relative to earth or sun's rotation?

2007-01-26 10:07:34 · 6 answers · asked by jose o 6

How does it work? i tryed to read it on wikipedia but it just sounded a lil over my head and i was just looking for a simpler explination.

2007-01-26 09:31:54 · 2 answers · asked by Anonymous

zone time

2007-01-26 09:21:33 · 9 answers · asked by bmw z 1

In a physics experiment, a student places .3703 kg of copper in an insulated plastic tube 1.49 m long. The tube is inverted 373 times by the student. Assuming that the tube does not absorb any of the energy, what is the temperature increase of the copper in deg C?

How would you do this if they do not give you the original temperature of the copper??

2007-01-26 09:14:44 · 4 answers · asked by Anonymous

A metal sphere with a mass of 2.00 kg rolls along a frictionless surface at 12.0 m/s and stikes a stationary sphere having a mass of 6.00kg. The first sphere stops completely. At what speed does the second sphere move away from the point of impact?

2007-01-26 07:34:54 · 7 answers · asked by Anonymous

eventually pull them straight down

2007-01-26 07:32:22 · 7 answers · asked by ? 4

What is the ships new velocity if it was originally traveling at 2.8 m/s?

2007-01-26 07:29:50 · 2 answers · asked by Anonymous

What exactly young modulus means, like speed means distance over time. Similarly its unit (10m/s) means 10 meters are covered in one second. What does the unit of young modulus means (Pascals Pa) e.g 6.25 X 10*12 Pa means...

2007-01-26 07:29:20 · 1 answers · asked by Best Bowler 1

2007-01-26 07:27:33 · 1 answers · asked by Anonymous

ok - i was bored at work so i decided to spin myself around in my chair for a while....i know i made myself dizzy...i was just wondering why when i stop turning why does it take about 5-10 secs before the rest of the world does....what causes this...?

2007-01-26 06:51:59 · 18 answers · asked by beachnut222000 4

2007-01-26 06:45:33 · 5 answers · asked by ladona c 1

2007-01-26 06:38:11 · 4 answers · asked by Jill L 1

This question is only for the enlightened ones! This was supposed to go in Physics section but somehow went to Maths one. So reposting over here.

Can we truly have an unbiased event? All events which we call as unbiased are so because we cannot, at this stage, account for all the forces affecting the outcome.
For example, tossing a coin or rolling a dice is not an unbiased event as the outcome for the same can be predicted if we know all the intial conditions and the forces acting on coin/dice.
So can we really have an unbiased event? Some long ago told me that it happens in the world of quantum mechanics, but I am not sure.
Can someone throw some light on it?

2007-01-26 06:15:13 · 8 answers · asked by Anonymous