Physics - March 2007

After the mass has fallen three-fourths of the way to the ground, its kinetic energy will be equal to

a. mgh/4

b. 3mgh/4

c. mgh

d. 4/3mg

2007-03-31 23:15:09 · 8 answers · asked by nina l 1

what is the upper and lower boundary of the resitivity of human skin?
How many volts of electricity is the maximum that the body of a person can withstand before dying?

2007-03-31 22:56:29 · 1 answers · asked by ghostrider.com 2

frictionless table. The total kinetic energy gained by the mass is

a. 3.2 J
b. 5.0 J
c. 10. J
d. 20. J

2007-03-31 22:52:55 · 2 answers · asked by nina l 1

Earth, the kinetic energy of the satellite

a. decreases
b. increases
c. remains the same

2007-03-31 22:50:36 · 2 answers · asked by nina l 1

2007-03-31 21:55:33 · 10 answers · asked by doobnew 1

I recall once reading about a bomb that I think was called a carbon bomb (though google searches seem to be proving me wrong) and was claimed to be the most powerful bomb, only it was purely theoretical because it fed off oxygen (or perhaps some other element in the atmosphere) and so it would continue going until that was all used up and would basically mean the end of life. Anyone know what the name of this bomb is?

2007-03-31 21:30:23 · 5 answers · asked by sailorjurai108 1

It's a direct translation from italian, forgive the mistakes:

A container with thermically insulating walls has 2 parts, part A which contains a m(A)=1230 g of water at a temperature of 15.6 degrees Celsius, and part B which contains a m(B)=830 g of ice at a temp. of 0 degrees Celsius. The two parts are divided by an insulating plate.

If the insulating plate is removed, what is the final temperature of the system?What is the heat exchanged between water and ice?

(latent heat of fusion for ice: r=79.7 cal/g)

PS. I think I managed to do it by bringing the water to 0 degrees, but I do not understand why I should do that. Though, it's the only way I managed to do it.

I tried to solve it considering the final temperature as an unknown quantity, but then the unknown quantities were two, with only one equation.

Please give me a method to understand what the final temperature is without me guessing it at first.

Thanks!

2007-03-31 20:59:31 · 2 answers · asked by fluvly 2

Why does a moving charged particle produce a magnetic field? And why is the 'magnetic force' (is that the correct term?) generated by a moving charged particle perpendicular to the field as well as the velocity of the charged particle? Is there a known reason for these phenomena, other than these are what are predicted mathematically/observed experimentally?

What exactly is a magnetic field anyway? I know it is one part of the electromagnetic field, but that does not really tell me anything.

If possible, please explain in simple terms without using math (not a mathematician or a physicist!).

2007-03-31 18:43:33 · 6 answers · asked by Sithara B 2

As it is occurred often to me, I want to know about this subject. Could you explain about it??

2007-03-31 18:43:11 · 13 answers · asked by Anonymous

This has to do with matter and science.

2007-03-31 17:44:56 · 12 answers · asked by jazmine c 1

The quantity that undergoes a red shift is

Wave frequency
wavelength
both
neither

I have no idea on this question...help would be greatly appreciated. If anyone could explain the answer that would help a lot.

thx

2007-03-31 17:09:15 · 4 answers · asked by Anonymous

Einstein, when asked what he thought time was, replied, "Time is that which is measured by a clock." Others see time as a linear dimension, or a fuzzy overlay of a dimension on top of our 3 space dimensions. I see it as being established by entropy. What's yours?

2007-03-31 16:07:56 · 8 answers · asked by gryphen 5

F is force
k is constant of proportionality.
m is the mass
a is acceleration

2007-03-31 15:35:46 · 4 answers · asked by Anonymous

I understand that light energy may consist of photons that
altho may not have mass - they do leave a trace of some sort
that indicates light is not pure energy...?

2007-03-31 14:39:02 · 6 answers · asked by mickey the fox 1

is the hexagon puzzling because it is more pemanent than earth storms- what comparison does it have to say Katrina

2007-03-31 14:33:25 · 4 answers · asked by Agnes T 1

I would like proof for the answer.. pls!!

2007-03-31 14:20:01 · 8 answers · asked by ....!?! . 1

I don't get it- how can current from the mains go in alternating directions? And where does it go back and forth between?

Is it shooting out of the plug and back in again to the power station?

2007-03-31 12:57:42 · 10 answers · asked by richy 2

2007-03-31 12:37:44 · 8 answers · asked by RIPUL8R 2

2007-03-31 12:36:07 · 9 answers · asked by terreentn2 1

Does gravity and magnetic fields hold everything together?
Without gravity would everything cease to exist because the universe and star clusters are like held together by gravity but atoms are held together by positives and negs

2007-03-31 12:28:38 · 8 answers · asked by Anonymous

Also, Why does the body feel cooler in moving air than in still air?

I know it has something to do with the fact that heat transfers from hotter to cooler, and heat capacity and phase change. But I really don't know how to answer these two questions exactly especially the second one. Any help would be greatly appreciated. Thanks

2007-03-31 10:32:58 · 12 answers · asked by stingray4540 2

2007-03-31 09:45:10 · 18 answers · asked by sunsworth1975 1

You are holding a shopping basket at the grocery store with two 0.55 kg cartons of cereal at one end of the basket. The basket is 0.81 m long. Where should you place a half gallon of milk (1.8 kg) so that the center of mass (COM) of your groceries is at the center of the basket?

m from the center of the basket, opposite the cartons of cereal.

2007-03-31 09:27:38 · 2 answers · asked by soccerjock 2

Please explain.

2007-03-31 08:23:27 · 4 answers · asked by SomeGirl 3

2007-03-31 08:04:20 · 1 answers · asked by Shawn G 1

2007-03-31 08:03:57 · 2 answers · asked by Shawn G 1

2007-03-31 07:44:36 · 1 answers · asked by Anonymous

2007-03-31 07:43:58 · 5 answers · asked by Anonymous

2007-03-31 07:03:34 · 8 answers · asked by ForGood 1

here are the options...?
please help

1)1/s^2
2)kg m2/s^2
3)kg m2/s
4)m/s
5)none of the above

2007-03-31 06:54:47 · 5 answers · asked by NOne N 1