Physics - April 2007

Question: A layer of liquid B floats on liquid A. A ray of light begins in liquid A and undergoes total internal reflection at the interface between the angle of incidence exceeds 36.5 degrees. When liquid B is replaced with liquid C, total internal reflection occurs for angles of icidence greater than 47.0 degrees. Find the ratio nB/nC of the refractive indices of liquids B and C.

My Approach: I usually have one for every question I post, but this time I am completely STUMPED! I know they provide both angles of incidence, but I cannot understand the part where liquid B is replaced with liquid C. How am I supposed to figure the B in order to put in the nB/nC ratio???

I would love to see how to work this problem!
Answer from the Book: 0.813

2007-04-03 15:25:04 · 2 answers · asked by Jimmy 3

I have wondered for quite some time.First,what keeps our molecules together,and second,If atoms like we are made of look like a solar system,who's to say that we are just not microns,just a part of a larger being we have no knowledge of?
And no,I didn't just smoke a joint.

2007-04-03 15:03:47 · 9 answers · asked by Anonymous

could you conduct an experiment to find out if the earth is moving, obviously you can't just look in a book and know the earth is moving.

thank you

2007-04-03 14:37:36 · 13 answers · asked by Jon 2

The brakes of a car moving at 14m/s are suddenly applied and the car stops 4s later

A. What is the cars acceleration?

B. How long will it take the car to stop, starting from 20m/s with the same acceleration?

C. How long will it take to slow down from 20 m/s to 10 m/s with the same acceleration?

Here are the answers I got:
A. 3.5 m/s
B. 5.71 s
C. 2.85 s

I think A is correct but I'm not sure about B and C. Help?

2007-04-03 14:15:54 · 3 answers · asked by tu madre 1

if a calculator falls off a desk and hits the floor 0.39 seconds later, how tall is the desk and how fast would the calculator be traveling when it hits the floor?

2007-04-03 14:07:12 · 2 answers · asked by R K 1

I have two objects moving at speeds near that of light and they are moving perpendicular to each other.

Lab frame is S, I have a nucleus moving at velocity of V with respect to S. The nucleus is at rest in it's own frame S'. From the nucleus an electron is emitted with velocity v' perpendicular to the direction of V. What is the velocity v of the electron in the lab frame S?

2007-04-03 14:06:55 · 2 answers · asked by Anonymous

i want it to be something about hair i need it tonight!!!!!! HELP!!!!!!!!!

2007-04-03 14:04:04 · 1 answers · asked by ashley 1

In an insulated container, 0.800kg of water at 40.0degrees celcius is mixed with 0.500kg of ice at -15 degrees celcius . Find the final temperature of the system. The freezing point of water is 0degrees celcius.

2007-04-03 13:56:38 · 1 answers · asked by RhondaJo 2

Can the pilot hear contact with base?

2007-04-03 13:45:01 · 10 answers · asked by mimisma 2

2007-04-03 13:30:22 · 6 answers · asked by true_friend 3

one of my friends asked me about finding the weigh of one atom.i don't know the answer.so i need to your help.and i will be thankfull.

2007-04-03 13:16:08 · 1 answers · asked by Anonymous

2007-04-03 12:44:11 · 2 answers · asked by Anonymous

neon

2007-04-03 12:25:40 · 1 answers · asked by Anonymous

Thank you for all of your answers

2007-04-03 12:23:00 · 11 answers · asked by furisded 3

Given light and very long pole. Items are rigged such that as soon as light is on pole is also pushed. Sensor at the end detects both light and the push. Would the sensor detect the light or the pole push first?

2007-04-03 12:13:11 · 5 answers · asked by Hitchhiker 4

2007-04-03 12:10:24 · 1 answers · asked by Ashley 1

2007-04-03 12:09:39 · 10 answers · asked by Anonymous

2007-04-03 12:06:06 · 3 answers · asked by Anonymous

o keep the ladder from slipping, the bottom of the ladder is tied to the wall with a thin wire. The tension in the wire is 29.4 N. The wire will break if the tension exceeds 200 N.

How far up the ladder can a 86 kg person climb? (Measure along the length of the ladder.)

http://www.webassign.net/tipler/12_63.gif

2007-04-03 11:59:53 · 1 answers · asked by Anonymous

Will everything be destroyed? What abouth things without accelereation? Will they resist? I'm interested in what would happen with zero gravity within 10 seconds. Thank you for your help!

2007-04-03 11:55:11 · 7 answers · asked by phlip 1

How exactly are we able to see in 3-D? As far as I know, all "seeing" is light hitting our eye. Light hits an object (say, a wall) and bounces off. That light then travels and hits our eyes. That means we arent "seeing" the object, rather just the light hitting our eye. It seems to me, then, that we shouldnt have any depth perception. Everything we "see" should be right in our face, taking up our entire view. Because the light is touching our eyes. How exactly do we get depth in our visions when all we are seeing is light that is directly touching our eye? I hope that makes sense...

2007-04-03 11:54:07 · 5 answers · asked by James 1

Example: Can you take a standard alternator, add an aluminum circle disc to the top with 3 magnets and 1 counterweight, add 3 opposite magnets to the exterior circumference outside the disc and use the free form of magnetic push to continously spin the alternator/GENERATOR to create constant voltage? Opinions? Can this be created on a much larger scale to supply power to a house or neighborhood? Or would we need to engineer a much different form of magnetic push model ?

2007-04-03 11:18:43 · 5 answers · asked by Dalro 1

2007-04-03 10:19:57 · 4 answers · asked by mailjoebadiah 1

A 5.0 kg shell is moving at 200 m/s south. The momentum of the shell is??

a) 400 east
b) 6000 north
c) 1000 south
d) 150 south
e) 1020 south

please help, I don't understand this, thank you!

2007-04-03 08:47:33 · 1 answers · asked by Anonymous

A 6.0 kg box slides up a 8.0 m long friction incline at an angle of 30 degrees by a force 50 N parallel to the incline. The velocity of the box is constant throughout and the coefficient of kinetic friction is 0.1. The network done on the box is??

a) -03.00
b) 96.55
c) -60.30
d) 305.00
e) 00.00

2007-04-03 08:45:39 · 3 answers · asked by Anonymous

A glider of mass 0.146 kg is moving to the right on a frictionless, horizontal air track with a speed of 0.750 m/s . It has a head-on collision with a glider 0.300 kg that is moving to the left with a speed of 2.23 m/s. Suppose the collision is elastic.

Find the magnitude of the final velocity of the 0.146 kg glider.

2007-04-03 08:32:03 · 1 answers · asked by ♡♥EM♡♥ 4

To keep the ladder from slipping, the bottom of the ladder is tied to the wall with a thin wire. The tension in the wire is 29.4 N. The wire will break if the tension exceeds 200 N.

How far up the ladder can a 86 kg person climb? (Measure along the length of the ladder.)

http://www.webassign.net/tipler/12_63.gif

2007-04-03 08:31:06 · 1 answers · asked by Anonymous

do you believe in string theory?
do you believe that the k=theory is relevant??

Witten has argued that K-theory is relevant to string theory for classifying D-brane charges. D-brane objects in string theory carry a type of charge called Ramond-Ramond charge. Ramond-Ramond fields are differential forms, and their charges should be classifed by ordinary cohomology. But gauge fields propagate on D-branes, and gauge fields give rise to vector bundles. This suggests that D-brane charge classification requires a generalization of cohomology to vector bundles -- hence K-theory.

what do you think??

i think he's got a point

2007-04-03 08:19:11 · 3 answers · asked by R I P 2

past in a path parallel to the line that joins the loudspeakers, the sound is heard to alternate from loud to soft. Suggest a path along which the listener could walk so as not to hear alternate loud and soft sounds.

2007-04-03 07:50:45 · 1 answers · asked by theprotector 1

2007-04-03 07:48:28 · 2 answers · asked by zombiehellmonkey 2