Physics - January 2007

Black metal bar of the white metal bar.

2007-01-17 22:07:27 · 17 answers · asked by sfumato1002 3

also would you put on weight because methane is lighter than air

2007-01-17 22:06:15 · 4 answers · asked by Grant B 3

A boat travels up stream in a river with a constant but unknown speed V with respect to water. At the start of this trip upstream, a bottle is dropped over the side. After 7.5 minutes the boat turns around and heads downstream. It catches up the bottle when the bottle has driffted 1 km down stream from the point at which it was dropped into water. Then the velocity of water current is?

2007-01-17 21:53:28 · 3 answers · asked by Ekant 2

a) 10 nm
b) 100 nm
c) 290 nm
d) 2900 cm
e) 29 m

2007-01-17 21:34:59 · 3 answers · asked by Anonymous

I'm working on a lab for school and I need a little help figuring out how to find the characteristic time for the FID. I have two signals: one looks like a sine function and the other a cosine function. They are each inside a decaying envelope (exp(-t/T)).

How do I determine T from the graph? Is it possible to use a Fourrier Transform?

2007-01-17 21:07:19 · 1 answers · asked by Ian 2

2007-01-17 20:49:15 · 7 answers · asked by vbagdy 3

2007-01-17 20:37:49 · 5 answers · asked by Anonymous

2007-01-17 20:06:25 · 5 answers · asked by the king 2

Conditions: I live in a suburb of Los Angeles; it drizzled earlier in the day; there was a slight breeze; it was after nightfall; the ice was on the glass of one car, and the fabric of the other's cover; and my thermometer's reading at this moment is 5° below the reading at the weather station located one mile away, and 1° above the reading from The Weather Channel's website.

2007-01-17 20:00:48 · 4 answers · asked by Anonymous

2007-01-17 19:47:09 · 7 answers · asked by the king 2

2007-01-17 19:23:05 · 1 answers · asked by Anonymous

Two point charges are located on the x axis: one charge, q1 = -11.0 nC, is located at -1.715m ; the second charge, q2 = 34.5 nC , is at the origin (x=0). What is the net force exerted by these two charges on a third charge q3= 52.0 nC placed between q1 and q2 at x3 = -1.145 ? Use 8.85×10−12 for the permittivity of free space.

2007-01-17 18:56:12 · 2 answers · asked by fertig 1

2007-01-17 18:43:38 · 4 answers · asked by Anonymous

What is time?
Daylight savings (moving the clock an hour back) proves that Time as a function of the hands of a clock is just what we have imposed on the natural world. However this can be taken to the greater extent of day/night cycle, seasons and revolutions around the sun in so much as our measurement of it has formed discreat units of time. But that dose not explain what time is.

Is time a force which can be discribed and measured or is a function of something greater than ourselves, or even could it just simply be the way that our brains percive an event (each action following the last in a sequence we call a timeline).

If all time is is just a way for our brains to process an event then could it not be possible to travel through time just by thinking?
Or if time is a function of something larger than ourselves, what?
Or if time is a force created by our universe then could it not be harnessed and used the way we use other forces?

Please explain your answers. Thank you

2007-01-17 17:25:33 · 6 answers · asked by Arthur N 4

If you have a cylinder with say r = 2, and its mass is uniformly distributed, would it get to the bottom of an inclined plane at a different time then a cylinder with r = 4? I think so, but I'm not totally sure.

2007-01-17 17:24:23 · 9 answers · asked by califrniateach 4

for example a 10,000 watt amplifier would equal how much horsepower.

2007-01-17 17:05:41 · 10 answers · asked by ? 1

So a train is traveling near the speed of light, let's say 3/4 the speed of light (C), and a man fires a bullet on the train that travels to his perspective at 3/4 C. From someone standing outside the train the bullet should appear to travel at 1 1/2 C, but that would be impossible (Einstein). So the answer must be that each object (the bullet and the train) must travel at a combined speed of less than the speed of light. So each objects speed is limited to just less than 1/2 C. But, a ant (stretch your imagination here ) is traveling along the bullet at just less than 1/2 C. Giving him a speed of more than C which is impossible, so each objects speed must be even slower, around 1/3 C. But a gnat is traveling across the ants back...etc. If you combine the speed of MANY objects traveling within each other, you should eventually come up with a train that can't travel more than a mere crawl. Where is the flaw with this reasoning? This paradox seems to have a Zeno quality to it.

2007-01-17 16:40:13 · 9 answers · asked by jedi1josh 5

1.A ball of mass 0.5 kg is rolling across a table top with a speed of 5 m/s. When the ball reaches the edge of the table it rolls down an incline onto the floor 1.0 meter below (without bouncing) What is the speed of the ball when it reaches the floor?

2. A hot whells car of mass 0.025 kg is traveling on a horizontal track with a velocity of 5.0 m/s. If the track suddenly turns upward, how high up the track can the car travel?

2007-01-17 16:35:03 · 4 answers · asked by xhbvi3tboix 3

I need someone's proffesional oppinion.

2007-01-17 16:15:32 · 14 answers · asked by csilver7722 1

Also, concerning the double slit experiment, can a photon be measured, but the collapse of the wavefunction be delayed if the tool used to measure the photon processes the information slowly, so that randomness can still occur even after the information is read? (Basically a photon goes through one slit and is read by a device that processes the information so slowly that the information isn't available until after the photon reaches the back wall.)

2007-01-17 16:04:08 · 3 answers · asked by jedi1josh 5

It seems that a thing with no mass ceases to be a thing. Also, if they has no mass, how do we know they exist? If it is something along the lines of "they exist as energy and not as matter" as I suspect the answer might be, then why call them particles, and classify them in the same category as things with mass (like protons)?

2007-01-17 15:43:58 · 8 answers · asked by jedi1josh 5

discoveries

2007-01-17 15:24:55 · 5 answers · asked by bww_824 1

2007-01-17 15:21:13 · 3 answers · asked by rcastrojt 1

ok im just wondering what the doomsday clock means and what will happen if it hits midnight plz explain it to me!?!?!?!?!?

2007-01-17 15:01:55 · 8 answers · asked by Anonymous

when going down a hill, is potential energy converted to kinetic energy or is that the other way around?

and how does conservation of energy relate to roller coasters?

2007-01-17 14:54:38 · 2 answers · asked by tingerpoo 2

Radio waves travel at the speed of light, which is 3.00 *10^8 m/s. How many minutes does it take for a radio message to reach Earth from Mars if Mars is 9.9 *10^7 km from Earth?

2007-01-17 14:26:25 · 3 answers · asked by Alan l 1

Can someone explain for my daughter, why the strawberries (and presumably other fruit does also) in a tub of strawberry yoghurt rise to the top of the container? We would like to understand the physics of it. I have noticed that the same thing happens with cans of beans and yet when making a cake, the fruit tends to sink.

2007-01-17 14:09:07 · 1 answers · asked by Lilliana 2

2007-01-17 14:02:35 · 7 answers · asked by Anonymous

A boulder of mass 600kg tumbles down a montainside and stops 160 m below. If the temperature of the boulder, montain, and surrounding air are all at 300k, What is the change in entropy of the Universe? I
I know the formula but I dono what I have to do with the given mass? How do I find Q?

2007-01-17 14:00:53 · 1 answers · asked by Kitana 2

Imagine a laser pointer on a turntable. This turntable spins very fast, so that the point of light on the wall is moving faster than the speed of light. It is in a circular room. If you are standing in the room staring at one point, what do you see? If you are spinning with the turntable, what do you see?

Thanks so much!

2007-01-17 13:42:22 · 9 answers · asked by Anonymous