Physics - March 2007

When a ray of light is incident on a glass plate, the emergent ray is parallel to the incident ray but displaced from it. For a given angle of incidence in air, what are the two properties of the glass plate that determine the amount of lateral displacement?

2007-03-28 16:19:20 · 1 answers · asked by Sir Guitarist 2

2007-03-28 16:03:29 · 11 answers · asked by lisa r 1

2007-03-28 16:02:32 · 4 answers · asked by lisa r 1

a)the force
b)the impulse
c)time
d)the mass times the time

2007-03-28 16:01:15 · 3 answers · asked by ilir d 1

2007-03-28 16:00:58 · 9 answers · asked by lisa r 1

2007-03-28 15:47:01 · 1 answers · asked by spartacus 1

If a light source were traveling at the speed of light, (or damn near it, for those that say nothing goes that fast) the photons emmited in the direction opposite of the direction of the traveling emitter would be going way slower, right?

To take this further, could the photon be said to be standing still by an observer from which the emmiter was traveling away from at speed c?

2007-03-28 15:33:48 · 3 answers · asked by Mike B 2

2007-03-28 15:28:45 · 1 answers · asked by F E 2

Two toy ducks, attached to each other by a string, are being pulled. The front duck is 5.0 kg and the back duck is 2.0 kg. If the guy pulls them with a force of 10 N and there is not friction, calculate:

a) acceleration of both ducks
b) tension of string connecting

2007-03-28 15:18:48 · 1 answers · asked by Chess 2

It is said that nothing in the universe is totally at rest. Motion is relative. So why would mass increase as an object aproached the "speed" of light? Wouldn't the speed of light be relative? And if so, then, the mass increase would be based on the perception of an observer and not absolute, right?

2007-03-28 15:14:33 · 3 answers · asked by Mike B 2

Question:
The feasibility of producing ethanol from ethylene and water in gaseous phase rxn is to be studied. You are required to give your comment on thermo of the process,
C2H4 + H2O = C2H5OH
It is believed that to get the min rate of rxn, the rxn has to be carried out at 260 degree C. However we would like to limit the max temperature to 538 degree C.

An expert suggested that the rxn has to be caried out at high Pressure. A pressure of 10 atm is considered sufficient. A conversion of 10% would result in the ethanol to be easily separated from the rxn mixture, and allow for a pilot plant study.

In view of limiting condition, as described in above, can the max conversion exceed 10%?

Discuss with suitable calculation how the conversion may be increased to be more than 10%??

2007-03-28 15:07:29 · 1 answers · asked by Zacky I 1

Falling objects drop with an average acceleration of 9.8m/sec/sec or 9.8m/sec to second. If an object falls from a tall building, how long will it take before it reaches a speed of 49m/sec? How is that calculated?

2007-03-28 15:03:56 · 2 answers · asked by daydream♥believer 4

2007-03-28 14:49:32 · 9 answers · asked by jmoney_96 1

A beam like this --------- not like this 0o0o0o0o0o0oo....it being and electromagnetic focusing beam!

2007-03-28 14:39:16 · 4 answers · asked by jumanjisapikey 3

a) What is its acceleration during the time it is stopping? (Be careful about the sign!)

Can anyone help me with this

2007-03-28 14:38:52 · 3 answers · asked by fabulous101 2

At some automobile toll-collecting stations, a thin metal wire sticks up fvromthe road and makes contactt with cars before they reach the toll collector.

What is the purpose of this wire?

2007-03-28 14:36:45 · 3 answers · asked by musiclistener234 3

2007-03-28 14:18:41 · 6 answers · asked by Anonymous

Two spherical objects are separated by a distance of 3.60* 10^3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result, each object experiences an electrostatic force that has a magnitude of 4.55* 10^21 N. How many electrons did it take to produce the charge on one of the objects?

2007-03-28 14:16:18 · 1 answers · asked by Alan l 1

A light string 4.00m long is wrapped around a solid cylindrical spool with a radius of .075m and a mass of .500kg. A 5.00 kg mass is then attached to the free end of the string, causing the string to unwind from the spool.

a. What is the angular acceleration of the spool

b. How fast will the spool be rotating after all of the string has unwound?

the answers are:
2600rad/s^2 (a)
530r/s (b)

If anyone can explain to me how to get those two answers i will greatly appreciate it, thanks.

2007-03-28 14:15:38 · 2 answers · asked by strawberrylollipop12345 1

I'm a teacher from the USA teaching at an international school in China, and one of my year 2 students just posed the question. He'd like to know the temp of a laser sword, but any laser will do. Thanks much!

2007-03-28 14:12:10 · 4 answers · asked by beqstar12 1

I have an assignment and I need more information on the physics of flight and Bernoulli's principle.

2007-03-28 14:07:15 · 4 answers · asked by Anonymous

2007-03-28 13:56:43 · 2 answers · asked by ~BuBbLy~ 1

A hair dryer draws 7.5A when plugged into a120-V line.

A) What is it's resistance?

B) How much charge passes through it in 15 min?

(assume direct current)

Please show work, so I can understand how to solve similar problems.

2007-03-28 13:54:16 · 2 answers · asked by vtchick1441 1

2007-03-28 13:53:58 · 1 answers · asked by solomondd 2

a car ,capable ofa constant accelarion of 2.5m/s^2, is stopped at a trafic light when the light turns green , the car starts from rest with this acceleration. also ,as the light turns green , a truck travelling with a constant velocity of 40km/h pass the car ,the car will eventually travel faster than the truck and willovertack it . where will the car catch up with the truck

2007-03-28 13:45:36 · 1 answers · asked by loveiranshiraz 1

For a project, I am creating an electromagnet. It works to my liking on a 12-volt lantern battery that has 7500mAh. I was wondering if I could instead use an AC to DC adaptor with the round end of it cut off and the split wires going to the positive and negative of my electromagnet. If the adaptor output is similar in voltage/amps to the battery, is the DC electricity leaving the adapter just as safe as the battery, or are their other considerations that I am not taking into account that would make this electricity less safe than battery electricity?

2007-03-28 13:33:07 · 2 answers · asked by Anonymous

I skier starts on top of a giant snowball. As the skier goes down, at what angle from vertical does the skier lose contact with the surface of the snowball?

2007-03-28 13:18:27 · 2 answers · asked by pinoihotshot 1

2007-03-28 13:00:54 · 1 answers · asked by Sally 2

A Puerto Rican professor of physics visits in the month of January and her colleagues offer to take her ice skating for the first time in her life. She has gotten herself into the middle of an ice rink and cannot figure out how to make the skates work. Every move she tries to make simply causes her to slip on the ice and leaves her in the same place she started. She decides that she can get off the ice by taking off her coat and throwing it in the opposite direction.
a.) Suppose she has a mass of 55 kg and her coat has a mass of 4.5 kg. If she bundles it up and throws it as hard as she can away from her, it leaves her hand with a speed of 3 m/s, moving to our left. Assuming that we choose a coordinate system with the positive-x direction point to our right, what is her velocity?

2007-03-28 12:43:44 · 1 answers · asked by Anonymous

A 92 kg astronaut and a 1600 kg satellite are at rest relative to the space shuttle. The astronaut pushes on the satellite, giving it a speed of 0.16 m/s directly away from the shuttle. Seven-and-a-half seconds later the astronaut comes into contact with the shuttle. What was the initial distance from the shuttle to the astronaut?

2007-03-28 12:42:58 · 2 answers · asked by Anonymous