Physics - February 2007

the ground state wavefunction is phi=(2/a)^(1/2) sin ((pi*x)/a)
what is the probability that the particle is :

A) in the right half of the box?
B) in the middle third of the box?

2007-02-24 06:59:02 · 4 answers · asked by Anonymous

I just measured a lime battery for my project and was wondering what resistance ment in the world or electricity.

2007-02-24 06:38:34 · 8 answers · asked by chibi-chan 2

2007-02-24 06:33:10 · 5 answers · asked by wren m 1

For eg. we r watching the live telecast of any event in the world on tv so how much time wud the signal from satellite take, from & back to the earth. If there is any special formula plz tell me.

2007-02-24 06:05:23 · 5 answers · asked by Sportsnut 1

Calculate the energy per photon and the number of photons emitted per second from a 100-W yellow bulb (lambda=550nm). [note the following relations may be useful 1W=1J/s, and the speed of light (c)=lambda(v)=3.0 x 10^8 m/s]

2007-02-24 05:52:03 · 1 answers · asked by Anonymous

ok so a have this physics project and i need to desine a solar heating system to heat my house and it's not working out so well
first i need to find the R value of my housebase on this

windows
total area 14,913 in2
R value=1.61

doors
total value 3,804 in2
R value =2.17

walls
Total area 19,385.4 in2
R=13.73

please show me show to do this so i can do well on my project

2007-02-24 05:33:00 · 2 answers · asked by Anonymous

If a postion vs. time plot is rising in time (but not in such a way as to produce a vertical line on the graph) then we can know for certain that _____________________________________?

please help me, thanks!

2007-02-24 05:20:29 · 4 answers · asked by Anonymous

Specific Heat Capacity and Thermal Conductivity

--------------------------------------------------------------------------------
1. The problem statement, all variables and given/known data

A pond of water at 0°C is covered with a layer of ice 4.50 cm thick. If the air temperature stays constant at -11.0°C, how much time does it take for the thickness of the ice to increase to 9.00 cm?

____________hours

Hint: To solve this problem, use the heat conduction equation,

dQ/dt = kA T/x

and note that the incremental energy dQ extracted from the water through the thickness x is the amount required to freeze a thickness dx of ice. That is, dQ = LA dx, where is the density of the ice, A is the area, and L is the latent heat of fusion. (The specific gravity and thermal conductivity for ice are, respectively, 0.917 is 2.0 W/m/°C.)



2. Relevant equations

Heat conduction equation

2007-02-24 05:17:41 · 3 answers · asked by nassafellow 2

On wiki it says 'Near room temperature resistance of a conductor increases linearly with temperature', but I'd like to know how it varies over a wider range. A rough image I found makes it look a bit loggy or exponential or something but I can't find an equation for any given temperature.

2007-02-24 05:15:43 · 3 answers · asked by Mr Poo 1

2007-02-24 05:13:34 · 8 answers · asked by steve r 1

2007-02-24 05:13:15 · 6 answers · asked by steve r 1

in still air under direct sunlight, tiny dust particles can often be ovserved to float. Explain how this happens. How could you test your answer?

2007-02-24 05:09:11 · 4 answers · asked by Anonymous

I dont get it!!! can someone explain???

2007-02-24 04:47:28 · 11 answers · asked by Aron N 1

what work is done when 5c is raised in potential by 1.5v?

2007-02-24 04:35:26 · 1 answers · asked by Anonymous

what potential different is appliced to two metal plates .5m apart if the electric field between them is 2.5 times 10 to the third n/c?

2007-02-24 04:34:22 · 1 answers · asked by Anonymous

2007-02-24 04:19:33 · 7 answers · asked by james o 2

On a banked race track, the smallest circular path on which cars can move has a radius r1 = 118 m, while the largest has a radius r2 = 165 m, as the drawing illustrates. The height of the outer wall is 18 m.
a) Find the smallest speed at which cars can move on this track without relying on friction.
b) Find the largest speed at which cars can move on this track without relying on friction.

2007-02-24 04:04:58 · 2 answers · asked by vntraderus88 1

Car A uses tires for which the coefficient of static friction is 1.1 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 20 m/s. Car B uses tires for which the coefficient of static friction is 0.95 on the same curve. What is the maximum speed at which car B can negotiate the curve?

2007-02-24 04:03:19 · 2 answers · asked by vntraderus88 1

It requires energy to perform work. In that the force of gravity continously performs work, what is the energy source? A person cannot say that it is due to mass only, because work is being continuously performed, forth coming energy must be being expended in order to do this. E = mc2, m = E/c2, c2 = E/m?

2007-02-24 03:55:44 · 7 answers · asked by Anonymous

Does any one know of any relatively simple "experiment" which I can set up that will help me determine an object's mass? I may not use a scale to weigh them. I also may not use their densities to determine the mass. You may not use the old type of weight scale which you balance the unknown's weight with a known one. Please help me

2007-02-24 03:47:43 · 4 answers · asked by oslolso 2

2007-02-24 03:07:01 · 1 answers · asked by Andy P 1

(advantages of gluon against photon)

2007-02-24 03:03:40 · 1 answers · asked by whatta! 2

A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. Assume the plane is traveling horizontally with a speed of 225 km/h (62.5 m/s).

Figure 3-37

(a) How far in advance of the recipients (horizontal distance) must the goods be dropped (Figure 3-37a)?
m
(b) Suppose, instead, that the plane releases the supplies a horizontal distance of 425 m in advance of the mountain climbers. What vertical velocity (up or down) should the supplies be given so that they arrive precisely at the climbers' position (Figure 3-37b)? (Assume up is positive.)
m/s
(c) With what speed do the supplies land in the latter case?
m/s

2007-02-24 02:48:20 · 3 answers · asked by nafiseh g 1

A race car driver must average 203.0 km/h over the course of a time trial lasting ten laps. If the first nine laps were done at 200.0 km/h, what average speed must be maintained for the last lap? (Answer to the nearest km/h.)
km/h

2007-02-24 02:45:31 · 5 answers · asked by nafiseh g 1

2007-02-24 02:43:56 · 11 answers · asked by RASHID 1

2007-02-24 02:39:23 · 3 answers · asked by cine 1

A 10m boat of mass 290 kg (of uniformly distributed mass), 100m away from shore has two people standing on its ends. The one standing on the end nearer to the shore is of 50kg and the other is of 60kg. If both of them start to walk and meet at the centre of the boat; then how far are they from the shore? The conditions are ideal and there is no resistance or breeze.

2007-02-24 02:12:20 · 4 answers · asked by Cephalic 3

After all, isn't art all about making something incredibly complicated (emotions) into something incredibly simple and beautiful? Isn't it rather fitting that the fundamentals of science and art cross over in this way?

2007-02-24 01:26:58 · 10 answers · asked by Anonymous

i need to make a plasma ball as a science project! can someone tell me the complete instructions and materials on how to make it. can someone help me?

2007-02-24 01:16:00 · 4 answers · asked by fancygirl 1

2007-02-24 00:55:57 · 5 answers · asked by Amal 2