Physics - October 2006

2006-10-13 18:13:58 · 3 answers · asked by hash 1

on a cold weather when temperature is -20C,what is the amount of heat needed to warm the body in37C, the .50L of air excahnged w/ each breath?specific heat capacity of air is 1020j/kg K and that 1L of air has a mass of 1.3x10 raise to the -3kg. How much heat is lost per hour if the respiration rate is 20 breaths/min.?

2006-10-13 17:54:51 · 1 answers · asked by Anonymous

2006-10-13 17:54:43 · 5 answers · asked by hash 1

2006-10-13 17:39:23 · 4 answers · asked by prashant s 1

As soon as the weather turns the slightest bit cool, I get shocked all the time. Sometimes when I put my key in the car door lock, you can see a spark. I don't know anyone else who it happens to as frequently. Does anyone know why, or what I can do to make it stop?

2006-10-13 17:37:25 · 4 answers · asked by bluelotus 3

Physics

2006-10-13 17:14:14 · 3 answers · asked by Inez C 1

The Vector V1 is 8.08 units long and points along the negative X axis.The Vector V2 is 4.51 units long and points at +45.0* to the positive X axis.
1.What are the X and Y components of each vector?
2.Determine the sum of two vectors(magnitude and angel)

2006-10-13 16:36:06 · 3 answers · asked by daranguyen_kpop4ever 1

I am zero at this topic, but VERY interested in it. The only knowledge I have about physics is Physical Science class in the 9th grade in High School. I would like to know if you have any book recommendations or websites, etc. Thanks.

2006-10-13 16:23:29 · 12 answers · asked by Anonymous

how does tht work...

2006-10-13 15:33:38 · 6 answers · asked by jp 1

When a falling meteor is at a distance above the earth’s surface of 3 times the earth’s radius what is its free fall acceleration due to the earth’s gravitational force exerted on it?

2006-10-13 15:33:31 · 3 answers · asked by Shane W 1

Plaskett’s binary system consists of two stars that revolve in a circular orbit around a center of mass, midway between them. This means that the masses of the two stars are equal. If the orbital velocity of each star is 220 km/s and the orbital period of each is 1404 days, find the mass of each star and compare the mass of the stars to the Sun of the earth.

2006-10-13 15:32:17 · 3 answers · asked by Shane W 1

This is like my third question, but if energy transforms into mass when you accelerate, can mass also be transformed into energy? In one of the answers someone told me the amount of mass was multiplied by the speed of light squared to get how much energy would come out if it. If it is possible, can you imagine what a massive amount of energy we could get of something the size of a car?!

2006-10-13 14:58:13 · 7 answers · asked by Anonymous

yes or no and y
500 on top and 500 on bottom of body

2006-10-13 14:49:00 · 7 answers · asked by Anonymous

I have heard that a normal magnets pole is decided by looking it turn on to the pole. but how do we decide the earths north pole is at there itself, why cant it be the south pole.

2006-10-13 14:36:29 · 10 answers · asked by Deepu 1

A box of textbooks of mass 24.4 kg rests on a loading ramp that makes an angle \alpha with the horizontal. The coefficient of kinetic friction is 0.270 and the coefficient of static friction is 0.330 .

As the angle \alpha is increased, find the minimum angle at which the box starts to slip.

At this angle, find the acceleration once the box has begun to move.
Take the free fall acceleration to be g = 9.80 m/s^2.

At this angle, how fast will the box be moving after it has slid a distance 5.50 m along the loading ramp?
Take the free fall acceleration to be g = 9.80 m/s^2.

2006-10-13 14:22:21 · 2 answers · asked by darkangelwattitude 1

A stockroom worker pushes a box with mass 11.4 kg on a horizontal surface with a constant speed of 3.90 m/s. The coefIficient of kinetic friction between the box and the surface is 0.200 .

What horizontal force must be applied by the worker to maintain the motion?
Take the free fall acceleration to be g = 9.80 m/s^2.

If the force calculated in part (A) is removed, how far does the box slide before coming to rest?
Take the free fall acceleration to be g = 9.80 m/s^2.

2006-10-13 14:03:02 · 1 answers · asked by darkangelwattitude 1

Your hair must be completely dry before you use a curling iron on it, as it will boil the water molecules in your hair and ruin it.

2006-10-13 14:01:39 · 4 answers · asked by greenfrogs 7

Imagine you have a bird, flying directly north. The sun is shining directly east (from the west). There is a wall to the east of the bird which runs at 45 degree angle so that as the bird flies forward it's perpendicular distance from the wall increases (e.g. running south-west to north east). So, as the bird flies north, it's shadow moves up the wall, going north at exactly the same speed. But because the wall is at an angle, the shadow is actually moving a greater distance than the bird in a set amount of time. So, the shadow is moving faster than the bird by a certain ratio. Now imagine that (somehow) this bird could travel at the speed of light. The shadow would therefore be travelling faster than the speed of light.

2006-10-13 14:00:24 · 11 answers · asked by BabyMD 2

2006-10-13 13:52:58 · 1 answers · asked by Anonymous

I know that there is freefall, which the gravity is constantly pulling the astronauts down. But how come they dont actually fall in?

On Earth, if you jump off froma plane, you can fell weightless, but you are actually falling down and you will die if you don't land properly.
How come the situation is different from the situation in space?

And how come the satalite can move faster than earth's rotation, if you say it is just keep falling toward the Earth?

(Tell me if you don't get what I am saying)

2006-10-13 13:49:33 · 6 answers · asked by help_our_health 1

slides on a horizontal frictionless surface with a speed of 1.4 m/s. It is brought momentarily to rest when it hits a bumper that compresses a spring. Acceleration of gravity is 9.8 m/s^2.

How much is the spring compressed if its force constant is 8 kN/m? Answer in units of m.

2006-10-13 13:39:20 · 1 answers · asked by Mariska 2

This question is based on the "Speed of light?" question that was asked some minutes ago. I would like to know if, say, there is an atom travelling at speed of light in a vacuum, how can it gain mass if everything around it is nothing but empty space? Does this mean that space can transform into matter? I'm confused!

p.s. Sorry if my question sounds kind of ignorant but I'm really interested in physics and am considering this field for college.

2006-10-13 13:35:33 · 4 answers · asked by Anonymous

why is there a speed limit to light and also if a particle has always traveled faster than light then would it be detectable?

2006-10-13 12:52:46 · 10 answers · asked by breastfed43 3

2006-10-13 11:45:50 · 12 answers · asked by tsamba 2

I have always been very interested in chemistry and physics, but when I watched this documentary it blew my mind. Even though I didn't understand 100% of the idea, but I was amazed at how small things can have a great impact on massive things. Do you think it's true, or just numerology? Give me your thoughts. Thank you.

2006-10-13 11:20:09 · 10 answers · asked by Anonymous

2006-10-13 11:20:03 · 8 answers · asked by gen 2

travel through time. I wondered about that, then realized it might be impossible. How and why? The answer will surprise you!


The answer occurred to me from watching the "Back to the Future" trilogy. I already gave too big (of) a hint...

2006-10-13 11:13:35 · 11 answers · asked by comedycatalyst 2

2006-10-13 10:02:58 · 4 answers · asked by poeyteller 1

If you were a patent clerk and someone applied for a patent for a perpetual motion machine, would you deny them a patent without even looking at their design? After all, perpetual motion machines are supposed to be prohibited by the laws of thermodynamics. I'm just curious what you would do. (If you can't tell by the quality of this question, I'm a little bored today)

2006-10-13 08:52:18 · 18 answers · asked by Link 5

2006-10-13 08:36:33 · 7 answers · asked by ebola4dollars 1