Physics - May 2007

given E1=4.0v E2=2.0V R1=1ohms R2= 2ohms R3=3ohms. determine the current in each branch.

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x x x
E1 R2 E2
x x x
xxxxxR1xxxxxxxxxxxxxR2xxxxx

thanks

2007-05-09 16:41:09 · 1 answers · asked by decoyname4t 2

heres my scenario: i just walked outside to get the mail, its 10pm here so i look up and see a star. it occurs to me that the light from that star has traveled however many millions of miles just to end up in my eye. its a cool thought to look into the past like that but heres what i don't understand. i was thinking that the light was coming from a direct line from the star to my eye. then i looked out the window to find the star again, wanting to see the past again. it then occurred to me that if i stood outside and looked at it, and my friend stood at the window and looked at it, we would both have the same scenario: light traveling across the universe into our eyes. do all stars (or all light and light sources for that matter) project light in all possible directions? is light from a source omitted everywhere and it travels until its absorbed? why don't stars that we can see but are far away illuminate our skies?

2007-05-09 16:25:31 · 6 answers · asked by Anonymous

The most powerful ice breaker in the world was built in the former Soviet Union. The ship is almost 150 meters long, and its nuclear engine generates 56 MV of power. How much work can this engine do in 1 hour?

And the first practical car to use a gasoline engine was built in London in 1826. The power generated by the engine was just 2984W. If this engine ran for 12 seconds, what would the final kinetic energy of the car be, assuming it started from rest?

2007-05-09 16:23:04 · 3 answers · asked by newjerseyweather 1

If there was a universe without any mass, could the vacuum inside it have energy?

2007-05-09 16:14:48 · 4 answers · asked by The Ponderer 3

2007-05-09 16:13:08 · 2 answers · asked by danzer^ 2

If I'm looking at a star in the night sky that astronomers tell me is 400 light years distant, then the photons striking my rods and cones have been unchanged for 400 million years and mind boggling distance. But where do they go then? Are they converted to heat? Does an electron fly out of my eye? I want to know where that particle without mass, or that packet of energy that has maintained it's speed and properties for as long or far as there are stars to see--where does it go when it finally meets the back of my eyeballs? Has that photon died? Can a photon die?

2007-05-09 15:58:03 · 6 answers · asked by Jim N 3

1. a 200 kg balsa with a volume of 2.00 cubic meter floats on the sea.what is the minimum number of 50 kg people able to board before it sinks?

2. given a drum of water raised to a height H, it develops a crack and water began to get out at velocity v, how can i know the range the water will reach?

These are the list of possible questions...pls. help me...tnx

2007-05-09 15:55:39 · 1 answers · asked by Anonymous

Me and my friends got into a debate over this.

If you have "absoultely nothing" then do you have something because that nothing is INDEED something.

Nothing IS something
and
something IS everything... including nothing, so therefore if you have nothing... do you have something?

2007-05-09 15:53:28 · 10 answers · asked by Pooshonmyshoos 2

It requires more heat to fuse helium than to fuse hydrogen, yet when a star has depleted its supply hydrogen it cools down! How does the star warm up again enough to fuse helium in its core?

2007-05-09 13:55:29 · 1 answers · asked by Anonymous

2007-05-09 13:48:16 · 2 answers · asked by framling 1

With the observed acceleration of the universe, does this change the theory?

2007-05-09 13:30:31 · 5 answers · asked by sassychickensuckerboy 4

a student believes that very sensitive photographic film can detect a virtual image. The student puts photographic film at the location of the image. Does this attempt succeed? Explain.

2007-05-09 13:29:14 · 1 answers · asked by framling 1

The volume of an ideal gas is adiabatically reduced from 200 L to 74.3 L. The initial pressure and temperature are 1.00 atm and 300 K. The final pressure is 4.00 atm. a) Is the gas monatomic, diatomic or polyatomic? b) What is the final temperature? c) How many moles are in the gas?

2007-05-09 13:20:49 · 1 answers · asked by Oscar P 1

2007-05-09 12:43:01 · 1 answers · asked by scoch man H 1

do they hit the floor at the same time and have the same distance?

2007-05-09 12:42:35 · 4 answers · asked by msclassyleo 1

if there was a big bang... what made that... it has to be God.

2007-05-09 12:29:11 · 9 answers · asked by Anonymous

Canadian Forces jets flying from Cold Lake, Alberta are restricted from flying at supersonic speeds over certain areas. Discuss the possible effects on wildlife subjected to regular supersonic air traffic. Explain why high altitude supersonic flights affect a greater area but have a diminished impact. I need this by tomorrow, this question will be on my physics test on Sound and Waves. Thank you.

2007-05-09 12:27:38 · 1 answers · asked by Anonymous

2007-05-09 12:26:50 · 1 answers · asked by Anonymous

We can hear sound around corners, but we cannot see around corners; yet both sound and light are waves. Please explain the difference.

2007-05-09 12:21:00 · 3 answers · asked by oceanchick4043 1

i mean how come if you went from New Zeelend to the north pole or something you wouldn't feel upside down? Also couldnt you fly out the other side of the world by not going straight up but going straight across?

2007-05-09 12:17:24 · 4 answers · asked by summer_lover_13 1

2007-05-09 11:50:54 · 7 answers · asked by Melvina 1

A uniform bar of length 10 m and mass 9 kg is attached to a wall with a hinge that exerts on the bar a horizontal force Hx and a vertical force Hy. The bar is held by a cord that makes
a 90± angle with respect to bar and angle 50 degree with respect to wall. The acceleration of gravity g = 9.8m/s^2
What is the magnitude of the horizontal force Hx on the pivot? Answer in units of N.

2007-05-09 10:31:54 · 2 answers · asked by p.b 1

A. closer to 0 than 1
B. above 1
C. below 0
D. near 1

2007-05-09 10:27:58 · 1 answers · asked by kia_1718 2

that has a 3,000 meter high mountain with the peak 2,000 meters from an enemy fort on the side exactly opposite the ship.
The ship's captain orders his gunners to attack the enemy fort with the 16 inch guns the moment the ship reaches the nearest position to fire.
The gunners have the option of firing the guns at 1,000 m/s
or 800 m/s and any angle from 15 degrees to 60 degrees. The shells each weigh 1,000 kg.
If the ship is 150 km from the peak when the order is given when is the optimal time, muzzle velocity and angle of the guns?
Ignore the curvature of the Earth, air resistance and assume the fort is on the same horizontal plane as the ship's guns.
The shot must clear the mountain and strike the fort. The shot will be from the front of the ship. The ship maintains constant speed throughout the maneuver.

2007-05-09 10:26:43 · 2 answers · asked by odu83 7

What is the conductivity for the following:

Copper
Silver
Gold
Silicon
Gallium
Arsenic

2007-05-09 10:22:31 · 2 answers · asked by Sara 3

How many does Copper have?
How many does Silver have?
How many does Gold?
How many does Silicon?
How many does Gallium?
How many does Arsenic?

2007-05-09 10:21:48 · 1 answers · asked by Sara 3

2007-05-09 10:17:27 · 17 answers · asked by ~kAyLa-BaBy~ 1

a) if the rate of motion changes so that the magnet is plunged in andn out 6 times per second, what will the be the new induced voltage?
b) if the number odf coils in the wire is doubled from 100 to 200, and the original rate of 2 times per second is kept the same, what will be the new voltage induced?

2007-05-09 10:04:35 · 2 answers · asked by HMMMMM 1

The room I have my computer in has French doors and two double hung windows. I open these all the way, but it never seems to cool off in this room, even with fans running. It's probably 10 to 15+ degrees warmer in this room than the other rooms.

Does my PC generate all of this excess heat, or do you think it's just the way the architecture of the room is?

2007-05-09 10:01:43 · 5 answers · asked by Anonymous

(a) Among priests who preach the Bible what percentage of priests actually read the Bible?

(b) Among scientists, who preach relativity what percentage of scientists actally read the textbook?

2007-05-09 09:33:40 · 5 answers · asked by Alexander 6