Physics - February 2007

2007-02-08 10:30:44 · 1 answers · asked by david w 5

I was reading somewhere that time is a made up by humans, can anyone else go into depth about it. it is really interesting to think what it would be without the measure of time and what else we would do!

2007-02-08 10:28:21 · 13 answers · asked by Lyndon 1

a 10^1m
b 10^0m
c 10^-2
c10^-4m

2007-02-08 10:21:02 · 7 answers · asked by Anonymous

2007-02-08 10:18:50 · 12 answers · asked by Anonymous

Since the "ATOM" is the building block of all matter and the only thing we find in an Atom are Negative & Positive Electrical Charges.

2007-02-08 10:12:12 · 4 answers · asked by Anonymous

Assuming ground is at sea level and no weather factors or anything. Standard conditions.

2007-02-08 10:08:35 · 3 answers · asked by cblrdy 6

2007-02-08 09:29:23 · 12 answers · asked by Stacey G 2

a 677 N weight is being held by two cables. The cable on the left is connected to a wall, has a tension of T, and creates an angle of theda with the wall. The cable on the right has a tension of 820 N and makes an angle of 39 degrees with the ceiling. What is the tension of the cable on the left? and what is the angle of theda? PLEASEE HELP!

heres a sloppy picture:

http://i1.tinypic.com/3zqacfc.jpg

2007-02-08 09:20:44 · 1 answers · asked by Taylor 1

What in a battery or in a eletrical wire powers electrical equipment, if atoms are responsible how do they react to duase the energy...
Detailed yet understanable answeres apprecaited.

2007-02-08 08:51:22 · 9 answers · asked by Lora 2

A fighter pilot dives his plane toward the ground at 395m/s. He pulls out of the dive on a vertical circle. What is the minimum radius of the circle, so that the normal force exerted on the pilot by his seat never exceeds three times his weight?

2007-02-08 08:44:28 · 1 answers · asked by truthiness89 2

On the same note, what about a gun? Would the bullet fire? Why or why not?

2007-02-08 08:43:13 · 6 answers · asked by Jinx 2

2007-02-08 08:32:47 · 7 answers · asked by fastfredy0 2

A 1457.0 kg weather rocket accelerates upward at 5.20 m/s2. It explodes 4.38 s after liftoff and breaks into two fragments, one twice as massive as the other. Photos reveal that the lighter fragment travelled straight up and reached a maximum height of 559.0 m measured from the ground. What was the velocity and direction of the heavier fragment just after the explosion? (Assume the positive direction is upward.)

2007-02-08 08:21:39 · 1 answers · asked by N 1

I have no clue what resultant dipole is.
someone please explain it and how we use that to determine if a molecule is polar or non polar
(chem help!)

2007-02-08 08:14:02 · 1 answers · asked by anna 2

A man drivers 10 mi E, then 13 mi in a direction 22.6 degrees W of S, then 4 mi at 45 degrees N of W. What is his overall displacement.

I got 14.87 degrees for 8.45 miles West of North as my answer, can anyone confirm this?

Thanks!

2007-02-08 08:05:09 · 3 answers · asked by axcryingxshame 1

if acceleration due to gravity on earth were to increase suddently, would this affect atmospheric pressure?

2007-02-08 08:00:49 · 2 answers · asked by Anonymous

supersaturated air conditions (100-200% humidity) in extreme cold conditions can produce phase change of water direct from liquid to solid, skipping the vapor phase

2007-02-08 07:43:40 · 9 answers · asked by snowflakebeach 1

1. Two knights are jousting. Both their horses take off running as fast as they can toward each other. The 65 kg green knight collides elastically with the 52 kg blue knight. The green knight goes flying backwards off his horse at 8 m/s as the blue knight goes flying backwards off his horse at 9 m/s. If the horses were to race, who would you put money on to win the race? Explain and give numbers supported by calculations.

2. If the collision were inelastic, how would the problem change?

3. If 1000 J was lost due to work done in the collision, how fast do each of the horses run?

2007-02-08 07:34:30 · 2 answers · asked by Alastor 1

2007-02-08 07:16:43 · 2 answers · asked by kaykaybre2003 1

talking about air exchange and why?

2007-02-08 07:06:37 · 11 answers · asked by Anonymous

Is there an estimate for the mass of the universe? Has it allways been this, even at the time of the big bang?

2007-02-08 07:02:52 · 13 answers · asked by footynutguy 4

Hypothetical scenario:

In outer space. Let's say a "void". No stars can be seen, it's pitch black and no gravity.

There's a two lost spacemen in a space suit. They both have a "light beacon", so they can see each other. One is moving let's say half the speed of light, but in a constant velocity. One is "sitting still" motionless.

As they pass one another, theory of relativity states that they are on a "equal footing". The guy that's moving at half of speed of light can claim that he is sitting still, the guy that's motionless can say he's moving at half light speed.

How can that be?? One is obviously moving and other one is not. But from what I read, they are both on a "equal footing". Either/or can claim that he is stationary or moving.

Can anyone explain?

2007-02-08 06:44:05 · 7 answers · asked by Anonymous

Imagination helps in this answer.

2007-02-08 06:21:59 · 31 answers · asked by Lou B 4

Does anyone know if you can use a PC controller with Star Wars Galaxies?

2007-02-08 05:51:51 · 2 answers · asked by bnsymv 2

i wonder what it is?

2007-02-08 05:36:02 · 11 answers · asked by Ben Wilson 1

Saudi Arabia pumps a cubic mile of crude oil out of earth every seven years at its present rate (which they hope to increase). In that this has been going on for many decades, if there is a land collapse, what will happen to the US, in that we depend on the Middle East for 60 percent of our oil?

2007-02-08 05:15:48 · 5 answers · asked by Anonymous

A mixture of ice and water in thermal balance it contains 20 liters water and 15 kg of ice. The system is heated up to give 2230 Kcals. Known that the heat of fusion of the ice is of 79,60 Kcal /Kg. Calculate the total variation of entropy of the system and how much heat should be given for getting a variation of entropy equal to 4,5 Kcal/Kelvin.

2007-02-08 05:11:02 · 1 answers · asked by alinez76 2

A proton (mass 20.0 u) is shot at a speed of 10000000.0 m/s toward a gold target. The nucleus of a gold atom (mass 177.0 u) repels the proton and deflects it staight back toward the source with 98.0 percent of its initial speed. What is the recoil velocity of the gold nucleus?

2007-02-08 04:48:22 · 2 answers · asked by N 1

2007-02-08 04:43:35 · 9 answers · asked by mathew 1

Why do space and time exist or must exist together?

And what is the spacetime continuum that many fictional characters(eg. hiro from heroes, doc brown from back to the future) babbling about?

2007-02-08 04:36:11 · 5 answers · asked by moon air 2