Physics - February 2007

A glass palte (n=1.53) that is .485um thick and surrounded by air is illuminated by a beam of white light normal to the plate

a.) what wavelengths (in air) within the limits of the visible spectrum (lambda=400nm to 700nm) are intensified in the reflected beam?

b.) What wavelenghts within the visible spectrum are intensified in the transmitted light?

guys!!! help me out PLEASE!!!!

2007-02-15 19:04:50 · 1 answers · asked by invu 1

Does photons experience friction as they r having particle nature also?

2007-02-15 18:35:33 · 10 answers · asked by rajesh bhowmick 2

Because of the law of conservation of energy the possibility of a perpetual motion is excluded, but the Universe itself is in a perpetual motion, so on what basis should we consider the conservation of energy as a law?

2007-02-15 18:23:58 · 7 answers · asked by Simona S 1

saw it in a movie wanted to know if it was real or not?

2007-02-15 18:01:07 · 9 answers · asked by epicn61 1

A man pushes on a piano of mass 180 kg so that it slides at a constant velocity of 12.0 cm/s down a ramp that is inclined at 11.0^\circ above the horizontal. No appreciable friction is acting on the piano. Calculate the magnitude and direction of this push

how can you have a constant velocity while applying constant force on a frictionless surface? am i missing something?

2007-02-15 17:41:49 · 4 answers · asked by trungngo18 1

How do you calculate error in an angle of incidence angle of refraction question?

2007-02-15 17:29:42 · 2 answers · asked by Anonymous

2007-02-15 17:01:19 · 6 answers · asked by Lasaire 1

A charge of 2.9 nC and a charge of 4.6 nC are separated by 40.0 cm. Find the equilibrium position for a -6 nC charge in meters.
___m (from the 2.9 nC charge)

2007-02-15 16:55:48 · 1 answers · asked by Fanjame 1

How does interference work if theres only one slit? In diffraction, how come there are black spaces in between the line?

2007-02-15 16:55:16 · 3 answers · asked by Kyu 1

A diver springs upward with an initial speed of 8 m/s from a diving board that is 3 m above the water.

a.) What is the maximum height the diver reaches above the water?
m

b.) Find the total time the diver is airborne.
s

c.) Will the diver spend more time travelling upwards or downwards? Explain.

2007-02-15 16:48:13 · 3 answers · asked by soccerjock 2

man wishes to vacuum his car with a canister vacuum cleaner marked 550 W at 120 V. The car is parked far from the building so he uses an extension cord 15.0 m long to plug the cleaner into a 120 V source. Assume that the cleaner has constant resistance.
(a) If the resistance of each of the two conductors of the extension cord is 0.900 , what is the actual power delivered to the cleaner?
W
(b) If, instead, the power is to be at least 540 W, what must be the diameter of each of the two identical copper conductors in the cord the young man buys?
mm
(c) Repeat part (b) if the power is to be at least 547 W. [Suggestion: A symbolic solution can simplify the calculations.]
mm

2007-02-15 16:37:38 · 1 answers · asked by Anonymous

A hot air balloon is rising upward with a constant speed of 15 m/s. When the balloon is 2 m above the ground, the balloonist accidentally drops a compass over the side.

a.) How much time elapses before it hits the ground?
1.62882 s ?

b.) What is its speed just before it hits the ground?
9.8 m/s ??

c.) How high above the ground is the balloon when the compass hits the ground? 2 m??

2007-02-15 16:21:27 · 4 answers · asked by soccerjock 2

In demonstrating diffraction with light through an aperture, why are there black spaces in between the light/line of light?

2007-02-15 16:18:51 · 2 answers · asked by Angelfire 2

2007-02-15 16:18:14 · 6 answers · asked by matt 1

If only an external force can change the momentum of the center of mass of an object, how can the internal force of the engine acclerate fa car?

2007-02-15 16:17:17 · 2 answers · asked by Space Cadet 3

What keeps them from drifting off into outer-space?

It should be getting colder as it goes up, & the balloon is farther away from earth. The further an object is from earth, the less the gravitational pull is, right? So it should be easier & easier to break free of the pull of gravity as the balloons go up.

What keeps them from going up forever, or until their hot air supply runs out?

2007-02-15 16:17:14 · 4 answers · asked by Anonymous

At the point of fission, a nucleus with 96 protons is divided into two smaller spheres, each with 48 protons and a radius of 6.4*10^-15 m. What is the repulsive force pushing these two spheres apart?

2007-02-15 16:14:26 · 1 answers · asked by Fanjame 1

I desperately need help with this problem...

Four charges are placed on the x axis as follows:
-7 micro coulombs at -5cm
8 micro coulombs at the origin
-4 micro coulombs at 4cm
-8 micro coulombs at 5cm.

Applying Coulombs law, what is the magnitude and direction of thenet electrostatic force acting on the charge at the origin???

Any help would help....or any tip on how to solve it.

PS. I know Coulombs law is: F= k* Q1*Q2 / distance^2

2007-02-15 16:08:52 · 4 answers · asked by Marisol 2

Two small spheres, each of mass 3.00 g, are suspended by light strings 10.0 cm in length (Fig. P23.62). A uniform electric field is applied in the x direction. The spheres have charges equal to -3.00 10-8 C and +3.00 10-8 C. Determine the electric field that enables the spheres to be in equilibrium at an angle of = 12.0°.

2007-02-15 16:05:34 · 2 answers · asked by Anonymous

taking into consideration the rotation n revolution in mind, can someone explain , why it takes more time to travel to a same place using one of the direction. Can someone please send the explanation , if links are available that would be more helpful.

2007-02-15 15:54:00 · 7 answers · asked by Anonymous

Please, if you can, tell how each type of plastic looks like.

2007-02-15 15:48:47 · 4 answers · asked by Anonymous

The heating coil of a hot-water heater has a resistance of 20 and operates at 210 V. If electrical energy costs $0.080/kWh, what does it cost to raise 270 kg of water in the tank from 15°C to 72°C?

2007-02-15 15:39:53 · 2 answers · asked by Anonymous

How long does it take to heat 125 L of water from 24.7°C to 47.3°C, neglecting conduction and other losses?

2007-02-15 15:38:29 · 3 answers · asked by Anonymous

2007-02-15 15:34:49 · 4 answers · asked by scottdauphin 1

Most of Ohio heard a loud bang or boom, boom between 8pm and midnight last night!! The weather man says it was ice moving!! Then how did the whole state hear it? The talk radio stations have been going nuts!! I heard it myself, along with my daughter!!We both really would like answers, other than Ice. The media must think we are completely stupid! The whole state heard Ice fall at the same time!!! Over Hundreds of miles!!!

2007-02-15 15:29:49 · 7 answers · asked by jacah5 3

There are four charges on the four corners of a square, the two on the right are negative, and the two on the left are both positive, they all have the same magnitude, Q, and the edges of the square are S. What is the magnitude of the electric field at the center of the square in terms of Q and S?

2007-02-15 15:07:02 · 1 answers · asked by Kevan G 1

2007-02-15 14:40:23 · 5 answers · asked by Anonymous

A beam of electron is accelerated through a potential difference of 10kV before entering a velocity selector. Of the B-field of the selector has a value of 10^-2 T, what value of the E-field is required of the particles are to be undeflected?

2007-02-15 14:14:55 · 1 answers · asked by Deco 2

2007-02-15 13:49:10 · 2 answers · asked by Scott S 1

2007-02-15 13:39:12 · 4 answers · asked by drogers43111 1