Physics - September 2007

A beam of green light, wavelength = 544 nm, is incident normally on a single slit of width w. The diffraction pattern is displayed on a screen placed 1 m from the slit.

The distance between the 1st and 2nd minima of this pattern is measured to be 2.4 cm. Calculate the width of the slit

2007-09-20 06:04:57 · 1 answers · asked by   4

2007-09-20 05:52:15 · 9 answers · asked by Michael n 2

i was in regular but got fregin transfered to honors and im not that smart in science and i really need help with these questions soooo if anyone knows the answers i would really appreciate it!!!!!!!!! thanks in advance!!!!!!!!!

A runner traveling with an initial velocity of 2.0 m/s accelerates at a constant rate of 1.9 m/s2 for a time of 3 seconds.

(a) What is his velocity at the end of this time?
m/s
(b) What distance does the runner cover during this process?
m



and


partscoretotalsubmissions1--10/42--10/4----2--A frightened cat, starting from rest, travels a distance of 4.90 m in 3.06 s, accelerating at a constant rate the entire time. What was her acceleration ?
Units?
m/s2
m
m2/s2
ms
m/s

and
A bus is accelerating at a rate of 0.340 m/s2. You are standing on the sidewalk as bus drives by. Exactly 3.31 s later it is travelling at 3.44 m/s. What was the velocity of the bus at the instant it passed you?
Units?
m
ms
m/s2
m/s
m2/s2
plz help!!

2007-09-20 05:33:28 · 3 answers · asked by Anonymous

The gravitational acceleration at the surface of a planet is 25.5 m/s2. Find the acceleration at a height above the surface equal to half the planet's radius.

2007-09-20 05:21:50 · 3 answers · asked by wil 1

2007-09-20 05:08:56 · 9 answers · asked by Anonymous

A model rocket is launched straight upward
with an initial speed of 47.8 m/s. It acceler-
ates with a constant upward acceleration of
2.19 m/s2 until its engines stop at an altitude
of 180 m.
a) What is the maximum height reached by
the rocket? Answer in units of m.

b) When does the rocket reach maximum
height? Answer in units of s.

c) How long is the rocket in the air? Answer
in units of s.

2007-09-20 05:07:49 · 1 answers · asked by kimn 1

Please provide the answer with a neat diagram. This is to prepare for a examination. If you have the reference book please scan and give the answer.

2007-09-20 05:04:36 · 1 answers · asked by siva k 1

2007-09-20 05:02:43 · 3 answers · asked by Anonymous

Is the person who made the inspection sheet an idiot?

2007-09-20 04:40:18 · 1 answers · asked by Anonymous

If the net force on a system is zero, is the net torque also zero?If the net torque on a system is zero, is the net force zero?

2007-09-20 04:29:41 · 4 answers · asked by hanani 1

Consider a small block sitting atop a much more massive block. There is some friction between the two blocks (call it μ sub 0). However, the bottom block sits on a frictionless surface. Initially the two blocks are at rest. Someone then gives the top block a push until it begins moving at a speed. At this point no further external forces are applied.

We observe that the small block begins to slow down and the large block begins to speed up. Explain why this happens (what forces are responsible), and write down expressions for velocity versus time for the 2 blocks. Compare both forces and accelerations on the 2 blocks. Then find the time it takes before the 2 blocks reach the same speed relative to the ground.

2007-09-20 04:21:13 · 1 answers · asked by Yea Op 1

What is the atomic wave of oxygen? I found atomic weight but not atomic wave.

2007-09-20 03:46:43 · 8 answers · asked by eagle 1

what are the proofs of the particles nature of light?

2007-09-20 03:45:38 · 5 answers · asked by jessamen o 1

10 points to the most creative question to go with these 3 pictures.

http://s223.photobucket.com/albums/dd78/floodtl/?action=view¤t=Takeoff.jpg

2007-09-20 03:38:48 · 1 answers · asked by Anonymous

My theory abou the universe is that...

A black hole was the source of the "Big Bang" the start of this universe, this can be explained because time can flow in 2 directions, forwards and backwards, so a black hole with time flowing backwards would expel matter instead of consuming it.

It is shown that all matter in the universe is moving away from all other matter and is speeding up, einstein said that matter travelling at a sufficiently high speed could in theory travel back in time, that means once all the matter in our universe reaches this speed it will move back in time to the point the universe was created (back to the black hole, with bacwards flowing time), this is where I am not sure what happens, does it just stop and fade from existence or does it all begin again?

If it begins again, I think this would mean we could have existed and died an infinite number of times again and again in a loop of time....

Is free will an illusion? are we just following a preset path

2007-09-20 02:54:08 · 16 answers · asked by Anonymous

electron collides with the tungsten atom, temparature then increased.Temparature causes the electron to reach the higher atomic orbit that means electron got an accelaration . Thus there is produced a magnetic field and an eletrical field and emits electromagnetic radiation . But the electron cannt go back to its original orbit unless the temparature is decreased .So my question is that why the electromagnetic radiation continues to radiate?

2007-09-20 02:33:21 · 4 answers · asked by Saka Chowdhury 2

If W= F x S
then If we keep the work done constant..then..
Force should be inversely propotional to the displacement produced.....
but its ain't seen in the real lyf...
more is the force the more is the displacement and vice -versa.....

2007-09-20 02:30:13 · 5 answers · asked by King HVJ 2

I know this is a crazy question, and I dont know if theres any way to measure this. Im just curious. Raindrops fall from pretty high up, so they have got to have tons of momentum . Just wondering if anybody knew the answer to this. In my physical science class we onced broke down the math on the flight of a rubber band...surprisingly they only fly about 15 mph.

2007-09-20 01:46:52 · 4 answers · asked by z71silveradodude 1

2007-09-20 01:05:22 · 3 answers · asked by icey27choco 1

i just dont get it. why does it have to be equal to 90 degrees to get the equilibrium??? i think we can get the equilibrium even if its not qual to 90 degrees but HE said that it should be 90.

2007-09-20 00:53:16 · 5 answers · asked by alexa r 1

2007-09-20 00:25:24 · 3 answers · asked by Anonymous

Damping is negligible for a 0.150kg object hanging from a light 6.30N/m spring. A sinusoidal force with an amplitude of 1.70N drives the system. At what frequency will the force make the object vibrate with an amplitude of 0.440m?

2007-09-20 00:13:44 · 1 answers · asked by Jay Z 1

2007-09-20 00:08:50 · 1 answers · asked by tagushtagushchubak 2

2007-09-19 23:33:04 · 2 answers · asked by jessamen o 1

2007-09-19 23:22:26 · 3 answers · asked by Anonymous

i want it analitically

2007-09-19 22:45:46 · 2 answers · asked by pany 2

2007-09-19 19:54:13 · 7 answers · asked by aryan e 1

Describe all the forces acting on a child riding a horse on a merry-go-round. Which of these forces provides the centripetal acceleration of the child?

2007-09-19 19:47:22 · 3 answers · asked by Doc^chem 2

2007-09-19 19:31:07 · 2 answers · asked by anands k 1

A projectile is launched with an initial speed of 75m/s at an angle of 40' above the horizon. The projectile lands on a hillside 5.0s later. Neglect air friction. a) What is the projectile's velocity at it's highest point of its trajectory? b) What is the straight-line distance from where the projectile was launched to where it hits its target? (Note that the hill may slope up or down from the launch point.)

I was able to calculate a) as 57.45 m/s, but I am unable to figure out b. Can anyone help me?

2007-09-19 19:27:19 · 4 answers · asked by lostinphysics 2