Physics - January 2007

Gas will expand more in hot weather than in cold weather and what you get is more fumes than gas. It this true?

2007-01-23 07:24:12 · 9 answers · asked by Mike D 2

I know this to be true, but what is the physics behind it?

2007-01-23 07:04:28 · 20 answers · asked by Sholly 1

An unseatbelted driver can be injured by the steering weel during a head on collision. Why does the driver hit the steering wheel when the car suddenly comes to a stop?

2007-01-23 06:54:47 · 2 answers · asked by Yarka 1

Heres some problemms I need help with

1) A car a rest accelerates to a constant velocity of 10m/s. THe car then immediatly acclerates at 8.5m/s^2. What is its velocity agter it has gone 200m?


2) A car traveling at 7.5m/s accelerates at a constant of 9m/s^2 for a distance of 100m. How much time does it take?

3) A car in a driveway slips its brake and rolls into the street at a speed of 0.5m/s. If the car is acclerated at a constant of 1.0m/s How fast is it moveing 2 seconds after it reaches the street.

4)A Javelin leaves a throwers hand at a velocity of 21m/s at an angle of 43 degrees above the horizontal.
What is its maximum height?
How long does it take to reach that height?
How far along the ground does it travel?
What are its x and y displacements?

2007-01-23 06:51:54 · 3 answers · asked by Daniel 1

because alcohol melt ice too.

2007-01-23 06:47:55 · 7 answers · asked by neo 1

2007-01-23 06:45:47 · 3 answers · asked by Anonymous

2007-01-23 06:19:42 · 9 answers · asked by Anonymous

if a sealed glass container with a capacity of 100ml contains 96ml of liquid watrer at 0 centigrade if the water freezes will the container rupture and why if yes?

2007-01-23 06:12:25 · 3 answers · asked by Anonymous

The first laser was invented in 1955 by a young man one years old who was into his own unorganize militia and that it was for his own self defense and offense and the lasers where over 100% efficent and not .01% and during his chemical combustion search for other fuels discovered a rocket fuel where he installed lasers on orbiting satellites with senors and target acquistion. He later became a jet pilot Luke Airforce base gave him the code name Luke Skywalker at three years old and connected satellite sentry's to his jet radar to make him the most deadly air to air foe. & he would do frquency doubling a single axial pulse threw jem stones such as rubies for rich women to get a pulse of light for additional incom in Scottsdale Az. & his targets where maim hamist people where Mayham got his name & i dont think it is a true one. since his SDI is military secret he was pass over for some fraudulent pig.

2007-01-23 05:39:18 · 2 answers · asked by Anonymous

According to law of conservation of energy , "energy is niether created nor destroyed but can be changed into one form or other," which form does the soul take when we die?

2007-01-23 05:31:22 · 17 answers · asked by Anonymous

I have 3 questions of nuclear power.

1). Why is there an explosion if nuclear fission is not controlled

2). How do we make nuclear fission, if we can't let the neutrons collide with the Uranium 235 atom just after we find uranium atoms? My encyclopedia says to increase the nuclear fuel, so what is the nuclear fuel?

3). Why does nuclear fusion create lots of energy, light and heat?

2007-01-23 05:12:17 · 3 answers · asked by Anonymous

A swimmer wants to cross a river, from point A to point B. The distance d1 (from A to C) is 200 m, the distance d2 (from C to B) is 150 m, and the speed vr of the current of the river is 5 km/hour. Suppose that the swimmer makes an angle of theta = 45 degrees (0.785 radians) with respect to the line from A to C. To swim directly from A to B, what speed is vs, relative to the water, should the swimmer have?

There's a figure attached, so I'll kind of explain it a little. If the line from A to C is the positive y direction, the line C to B is in the +y direction. The river current is 5 km/hour in the +x direction, while the swimmer has an angle of theta going in the -x and -y direction, so the swimmer is swimming in a kind of opposite direction from where the swimmer really wants to be.

Thanks so much for any help!

2007-01-23 05:09:23 · 3 answers · asked by Amanda 2

When I am around appliances or electronics, they start to make strange noises or behave strangely. My refrigerator sounds almost like ghosts live inside of it even while it is inactive, the washing machine makes a similar noise but only while active. One of my tvs broke not long after I bought it and volume goes up and down total randomly at times and other times it goes up when someone goes near it. It also goes on and off by itself. When I took it to the repair shop, I was told nothing was wrong with it. The appliances seem exactly as if they had ghosts controlling them. Sometimes when I try to open the refrigerator door it will unexpectedly make the noise, and when I pull the door there's like some kind of vacuum preventing the door from being opened.. The force is quite powerful, although it only lasts about 2-3 sec with the noise. Light bulbs often slightly flicker. Not a completely on & off flicker. A metallic tree has dangling leaves. When I look at it leaves rotate left & right

2007-01-23 04:34:43 · 2 answers · asked by Researcher of Knowledge 1

2007-01-23 04:33:21 · 5 answers · asked by micropterushunt 2

If light hits a mirror it spreads into various directions. In that process does the light lose its strength or intensity or does it retain its intensity in all the directions it spreads.

2007-01-23 04:30:04 · 1 answers · asked by nate_ramos_33 3

in very ideal condition what kind of answer can satisfy above mentioned problem?
is there any exact quantum mathematical solution that can interpret above experiment in a very exact formulation?
I mean a mathematical statement like fresnel and fraunhofer mathematical model for near field and far field experiment or very classical mathematical model for many photon double slit experiment?
it is obvious that the pattern of single electron (or photon)double slit experiment differes from classical mathematical model, and
then it is necessary to have correct mathematical statement, does such solution exist? I mean a solution that is originated from quantum mathematics and describes the intensity and shape of fringes in single electron (photon) double experiment?

2007-01-23 04:29:55 · 4 answers · asked by arahmaninejad 1

Is Einstein responsible for the Manhattan Project and the bombing of Nagasaki and Hiroshima that killed a lot of people?

2007-01-23 04:20:02 · 15 answers · asked by Paolo s 2

2007-01-23 04:11:00 · 5 answers · asked by micropterushunt 2

Rutherford in his alpha particle bombardment on gold-foil observed how the alpha particles were deflected.

Question : What change would have been observed in respect of deflection of alpha particles if metal foil other than gold foil was used.?

2007-01-23 04:09:15 · 7 answers · asked by Bimal 1

GIVEN: A cannonball shot with an initial velocity of 141 m/s at an angle of 36° follows a parabolic path and hits a balloon at the top of its trajectory.

____ m/s

2007-01-23 03:57:19 · 3 answers · asked by Khoi 1

A ship leaves port and travel on a steady course of 40deg N of due east at a steady speed of 8km.h.
How far due north and due east of the port is the ship after sailing for 1 hr?

I tried using pythagras theorem but it won't work out!

2007-01-23 03:55:06 · 3 answers · asked by Evans 1

GIVEN: A satellite is about 2.2e4 km from the (center of the) Earth.

2007-01-23 03:52:48 · 3 answers · asked by Khoi 1

_____ m/s

2007-01-23 03:51:02 · 3 answers · asked by Khoi 1

I need to know, and fast!

2007-01-23 03:50:55 · 2 answers · asked by KatLover/SailorManiac 2

*** A planet's moon travels in an approximately circular orbit of radius 8.6e7 meters with a period of 7 h 53 min. Calculate the mass of the planet from this information.

_____ kg

2007-01-23 03:49:29 · 2 answers · asked by Khoi 1

a cubical block of ice floating in water has to support a metal piece weighing 0.5 kg .what can be the minimum edge of the block so that it does not sink in water? sp.gravity of ice is 0.9

2007-01-23 03:49:15 · 5 answers · asked by raghu 1

** The mean distance of an asteroid from the Sun is 4.10 times that of Earth from the Sun. From Kepler's law of periods, calculate the number of years required for the asteroid to make one revolution about the Sun.

_____ years

2007-01-23 03:48:19 · 3 answers · asked by Khoi 1

Mg(OH)2

Is it an element or a compound?

Number of each atom?

2007-01-23 03:46:24 · 4 answers · asked by ☺ Joel ☺ 1

Is it possible?

2007-01-23 03:31:19 · 13 answers · asked by Shruti 2

2007-01-23 03:25:14 · 1 answers · asked by Tenchi T 1