Physics - May 2007

2007-05-23 14:07:25 · 4 answers · asked by Peter 1

(if you're in the northern hemisphere and heading to say south africa or australia that is)

2007-05-23 12:01:02 · 8 answers · asked by tina k 3

basic will do for GCSE level....year 11

2007-05-23 11:06:57 · 4 answers · asked by randikee 1

Ok go!

2007-05-23 10:53:41 · 3 answers · asked by kevin 2

2007-05-23 10:50:48 · 10 answers · asked by Anonymous

Two sounds propagate along steel rail (ordinary railroad rail).
First sound has wavelength in rail λ1=1 m.
Second sound has wavelength in rail λ2=1 mm.

2007-05-23 10:15:56 · 9 answers · asked by Alexander 6

2007-05-23 09:46:56 · 6 answers · asked by LeeBee 3

I'm just curious,.. is static the ONLY reason dust will 'settle' on a dry vertical surface? Or are there other factors in the 'equation'? Would be very interested into solving this trivial, yet intriguing question of mine - thanks!

2007-05-23 09:25:12 · 3 answers · asked by wildimagination2003 4

what is a standing wave? what wave behaviors are involed in creating a standing wave and how do they do it? how are standing waves and resonance applied to musical instruments. Thanks so much!

2007-05-23 08:05:41 · 2 answers · asked by Anonymous

The surface of water in rotating basket is supposed to
be parabolic, is not it?

2007-05-23 07:42:30 · 2 answers · asked by Alexander 6

A ball is dropped from rest from the top of a building and strikes the ground with a speed of Vf. From ground level a second ball is thrown straight upward at the same instant that the first ball is dropped. The initial speed of the second ball is v0=vf, the same speed with which the first ball will eventually strike the ground. Ignoring air resistance, decide whether the balls cross paths at half the height of the building , above the halfway point, or below the halfway point. Give your reasoning

2007-05-23 07:27:54 · 6 answers · asked by Kel 1

like companies manufacturing it and brief reveiew on construction,principle,types precautions

2007-05-23 07:20:56 · 2 answers · asked by karishma 1

OK I was told that waves travel through matter...right? Well then in space there is no matter and how does light travel to earth? With no matter then it shouldn't right?

2007-05-23 07:04:38 · 6 answers · asked by CHIQUITA 2

Ive got what seems to be a simple question, but I am completely confused. Im looking for the way to resolve this question, not neccessarily just the answer.

Basically the example im working with is: a 0.20 pF capacitor that has a voltage of 40 mV. How many more electroncs are on the negative plate compared to the positive plate?

2007-05-23 07:02:33 · 2 answers · asked by Anonymous

A cart is driven by a large propeller or fan which can accelerate or decelerate the cart. The cart starts out at the position x=0 meters, with an initial velocity of +5.0m/s and a constant acceleration due to the fan. The direction to the right is positive. The cart reaches a maxmum position of x=+12.5 meters, where it begins to travel in the negative direction. Find the acceleration of that cart.

Im really confused by these problems so if someone could help me out with detailed steps, that would be great!

2007-05-23 06:57:34 · 3 answers · asked by Kel 1

how can you ? i hear people useing potatos,lemons and salt water and pennys

which one of these method can light up a 75 watt light bulb and how

2007-05-23 06:24:08 · 6 answers · asked by nonya 1

is it possible to materialize energy? since we can turn matter into energy we must be able to turn energy into matter. is this already being applied? if so how? if not how far along are the studies?

2007-05-23 05:57:50 · 8 answers · asked by MojoFace 2

True or false: Heavier objects fall faster than light ones.

2007-05-23 05:12:51 · 5 answers · asked by Bettie_T 2

2007-05-23 04:17:14 · 3 answers · asked by Anonymous

PLEASE HELP!! thnx

2007-05-23 03:55:35 · 7 answers · asked by kb 1

If there is some water in the vitreous bottle and we strike with a palm from the top to the bottleneck, we can knock out the bottom of the bottle. Why? How to evaluate the force which knocks out the bottom of the bottle?

Thanks in advance

2007-05-23 03:46:03 · 2 answers · asked by Pythagor 1

2007-05-23 03:20:21 · 4 answers · asked by Anonymous

einstein`s photoelectric equation is actually another example of conservation of energy. please explain how this applies?

2007-05-23 03:18:57 · 3 answers · asked by >() 1

2007-05-23 03:18:24 · 7 answers · asked by Anonymous

2007-05-23 02:44:36 · 10 answers · asked by JEFFREY M 2

A. increases to four times as much
B. increases to twice as much
C. decreases by one-half.
C. decreases by one-quarter.

Two objects move toward each other because of gravity. as the objects get closer and closer the acceleration of each:

A. decreases because the force decreases
B. stays the same because the force between them
C. increases due to increased force between them.

D. decreases due to increased momentum in opposite directions

During an eclipse of the sun (when earth, moon, and sun are lined up), the ocean tides in the extrea ________ and are called ___________tides

A. low,spring
B. high,spring
C. low,neap
D. high, neap

2007-05-23 01:57:29 · 5 answers · asked by Anonymous

Ok, I really dont see why am I having a problem with this, it's just a matter of putting two equations toghether, but I just cant get the same answer the book has. So:
When the light turns green a car starts accelerating at constant 6 m/s^2 and at the same instant a truck passes it traveling 21 m/s. After how long will the car pass the truck?
As far as I can see we set up two equations?

d(t) = V x t
d(c) = 1/2 a t^2

then we put them together? leaving us with:

21 m/s x t = 6 t^2

we use the quadratic formula to find what t is ?

t = 7 s

Now we can just plug it in

d(t) = V x t = 21m/s x 7 s = 147
d(c) = 1/2 a t^2 = 3 m/s^2 x 49 = 147

the answer works... but the book says the answer is 168 m? Is there a chance that they actually just messed up ?

2007-05-23 01:53:43 · 6 answers · asked by Anonymous

I am not meaning to be racist but i have always wondered if we were all made at the same time or not?

2007-05-23 01:38:32 · 8 answers · asked by Anonymous

What are the proofs for the conclusion that speed of light is not dependent on the motion of its SOURCE and MEDIUM? Please give detailed answers.

2007-05-23 01:31:54 · 6 answers · asked by Chaste 2

A. 2
B. 4
C. 8
D. 16

Please help it'll me so much to me

A machine puts out 100 W of power for every 1000 W put into it. the efficiency of the machine is:

A. 10%
B. 50%
C. 90%
D. 110%

2007-05-23 01:30:29 · 3 answers · asked by Anonymous