Physics - January 2007

2007-01-31 14:15:55 · 7 answers · asked by Coolchick1984 1

what are they made up of?, it cant just be energy, because energy has no mass.

2007-01-31 14:12:20 · 6 answers · asked by andy 1

If the capacitor is discharged in 2.0 ms, how much charge passes through the body tissues?

What is the average power delivered to the tissues?

2007-01-31 14:03:39 · 1 answers · asked by Anonymous

What is your opinion on natural or unnatural factors that determine the conscious presence we have in our individual bodies? What do you feel determines which pair of eyes you will look through? Is it possible that we are merely energy fields that migrate from host to host as we die?

2007-01-31 13:53:49 · 1 answers · asked by Shawn H 6

An Originally stationary car with a mass of 1500kg reaches a velocity of 15m/sec 5 sec after starting. What is the car's acceleration? How much forch was required to reach this acceleration?

2007-01-31 13:53:02 · 2 answers · asked by Anonymous

2007-01-31 13:51:03 · 11 answers · asked by e=mc^2 1

2007-01-31 13:36:41 · 2 answers · asked by haydenrox05 2

First off, E=mc^2 so howcome photons don't have any mass, they just have energy?

2007-01-31 13:28:21 · 1 answers · asked by Anonymous

A typical lightening bolt has about 10.0 C of charge. How many excess electrons are in a typical lightening bolt?
10.0C / (1.6 x 10^-19 C) = 6.25 x 10^19 electrons.

Is this correct?

2007-01-31 13:25:24 · 1 answers · asked by billf39 2

I know that p is momentum and t is time, but it doesn't say what d is. Thanks.

2007-01-31 13:24:29 · 1 answers · asked by Need answers! 1

Today in my physics class, we did a drinking bird lab. I finished all the questions for the lab but one of the questions was

1. What force(s) (and direction of force(s)) is/are responsible for this observed process. [hint: more than one force]

I think it was the force of gravity and weight? but I am not sure. If anyone can give me more details, it would help. Thanks! Please leave serious answers :]

2007-01-31 13:20:02 · 1 answers · asked by Anonymous

2007-01-31 13:14:38 · 1 answers · asked by md5079 1

i think its inertia.. but is it the third law?

2007-01-31 13:06:56 · 1 answers · asked by theleprechaunsarecoming 1

What particles carries the 2 fields? Do they affect each other when they overlap? Does one make the other stronger or weaker when they overlap? Does the either field have an influence on the schrodinger wave equation probabilities?

2007-01-31 13:05:56 · 3 answers · asked by Anonymous

You charge a pipe by rubbing rabbit fur on it. The pipe is now negativly charged. You run water in a sink in a steady, slow stream. The charged rode is held close to the falling water. When the pipe is brought toward the water, the water is attracted to the pipe and moves slightly towards it

Can someone please explain to me how is happens

2007-01-31 13:04:15 · 1 answers · asked by swim-babe@sbcglobal.net 1

Ok help me with this please.....
I found that the deBroglie wave length of an oxygen molecule at room temp is 2.59 x 10^-11 m. The question I can't answer is as follows:
Compare this to the average distance between oxygen molecules in a gas at 1 bar at room temp and from this comparison would you think that an oxygen molecule under those conditions acts as a classical particle or a quantum mechnical wave/particle?

Please help!!

2007-01-31 13:02:13 · 1 answers · asked by Anonymous

I have a science project to do, and the concept is, use a plastic case and put things on it or in it so that it will keep an icecube frozen for an hour. I need to put insulators in it. any ideas?
thanks in advance for the help.

2007-01-31 12:59:03 · 171 answers · asked by Anonymous

below the water surface, and 1.8 seconds later the reflected signal is detected. how deep is the ocean beneath the ship?

2007-01-31 12:57:24 · 4 answers · asked by bhangra_di_rani2006 1

A series of light pulses, shaped like a cone, subtending an angle θ = 28.0°, is incident on a `light fiber', as illustrated. The time between pulses is measured just outside the left end of the fiber. If the time between the leading edge of one pulse and the trailing edge of the previous pulse is 39.0 ns, determine how long (L) the fiber can be before the two pulses overlap. (Assume that the fiber has an index of refraction, nglass = 1.52, and a diameter, d=1.34×10-4 m.)
http://www.learning.physics.dal.ca/library/Graphics/Gtype73/cone.gif

2007-01-31 12:49:57 · 1 answers · asked by 2 2 1

A car is to make a turn without skidding on an unbanked curve with a radius of 90 meters. If the coefficient of friction is 0.64, what is the maximum speed of the car can have?

2007-01-31 12:47:20 · 3 answers · asked by Anonymous

Yesterday I was sitting on a bench with my bf (about midnite) in the middle of a nice little area where old people live, quite cosy bench surrounded by trees and old people's houses. Anyway there was this rather loud BANG and then all the doors and windows of the houses surrounding us made a cracking noise!! seemed like all of them cracked! it was just a cracking noise echoing this bang, not real glass cracking... i dont think!

Anyway, an explanation would be great!

thanks xx

2007-01-31 12:34:06 · 12 answers · asked by Anonymous

Please show me how to do this problem:

A diffraction grating has 10000 slits per inch. White light is diffracted through it.
-At what angle will blue light (400 nm) be observed in first order diffraction?
-At what angle will red light (750 nm) be observed?
-If this rainbow were displayed on screen 3m from the grating, what distance would the rainbow span on the screen?

Thanks!!!

2007-01-31 12:24:54 · 1 answers · asked by Anonymous

Hi, in physics I need to drop an egg into an X but it cannot break. i can use anything. what are the best things to use and the best way to prevent the egg from droppin?

2007-01-31 12:24:00 · 8 answers · asked by santista 2

Calculate the magnitude of the force between two 4.05 µC point charges 9.8 cm apart.

and

How many electrons make up a charge of -75.0 µC?

and
If someone can solve any question that would be a great help..... thanks

What is the magnitude of the force a +17 µC charge exerts on a +2.8 mC charge 37 cm away?

and


Two charged dust particles exert a force of 2.7 10-2 N on each other. What will be the force if they are moved so they are only one-fourth as far apart?

and

Two charged spheres are 15.0 cm apart. They are moved, and the force on each of them is found to have been tripled. How far apart are they now?

2007-01-31 12:22:58 · 1 answers · asked by jang k 1

2007-01-31 12:10:47 · 16 answers · asked by Kahlid K 1

A golfer, standing on a fairway, hits a shot to a green that is elevated 4.72 m above where she is standing. If the ball leaves her club with a velocity of 49.0 m/s at an angle of 42.5 ° above the ground, find the time that the ball is in the air before it hits the green.

2007-01-31 12:09:15 · 1 answers · asked by Anonymous

For some reason, I just cannot get this problem. Well, here is the scenario:

A 20kg block is placed on a ramp of 22degrees. The block has been shot at a speed of 3 m/s from the bottom of the ramp. Assuming that the ramp is frictionless, how far up will the block go? And how long will it take for the block to return back to the "shooting" point?

Here is a picture of what the scenario looks like:

http://i91.photobucket.com/albums/k285/happygolucky2442/Aphunker.jpg

Thanks in advance, best answer to the person with the best explanation!

2007-01-31 11:58:47 · 6 answers · asked by Jer G 3

What equation is used to calculate the Fn or normal force acting on an object that is on a slope?

2007-01-31 11:50:17 · 7 answers · asked by Anonymous

A charge of +1.80 x 10^-9 C is placed at the origin, and another charge of +5.00 x 10^-9 C is placed at x=1.9m. The coulomb constant is 8.98755 x 10^9 (N x m^2/c^2). Find the point (coordinate) between these two charges where a charge of +3.50 x 10^-9 C should be placed so that the net electric force on it is zero. Answer in units of meters.

2007-01-31 11:36:49 · 2 answers · asked by Anonymous

The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply upward at the end. The sharp upward slope launches them into the air, where they perform acrobatic maneuvers. In the women's competition, the end of a typical launch ramp is directed 63° above the horizontal. With this launch angle, a skier attains a height of 10.2 m above the end of the ramp. What is the skier's launch speed?

2007-01-31 11:21:13 · 2 answers · asked by Anonymous