Physics - March 2007

as tempature of metal filament of an electric light bulb increase the resistance of the wire would
decrease
increase
remain the sAME

2007-03-15 09:41:06 · 3 answers · asked by Anonymous

A remote planet of radius R has gravitation potential
P(r) = -A/r. Its atmosphere has density d at sea level
and uniform temperature T.

What is total mass of the atmosphere?

2007-03-15 09:31:44 · 2 answers · asked by Alexander 6

A person working on the transmission of a car accidently drops a bolt into a tray of oil. The oil is 5.60 cm deep. The bolt appears to be 3.90 cm beneath the surface of the oil, when viewed from directly above. What is the index of the refraction of the oil?

2007-03-15 09:29:29 · 1 answers · asked by layc_510 2

Light is reflected from a glass coffee table. When the angle of incidence is 58.0°, the reflected light is completely polarized parallel to the surface of the glass. What is the index of refraction of the glass?

2007-03-15 09:28:40 · 2 answers · asked by layc_510 2

What did he have to fight within himself?

2007-03-15 09:27:30 · 10 answers · asked by angel 24x7 1

Lab 92 in the Conceptual physics Labrotory Manual
It is about electricity

2007-03-15 09:22:45 · 2 answers · asked by geekmeister 2

Can LN2 be kept in a pressurized system and maintain liquid form indefinitely or for a long time? How long? Would pressure build if it was in a sealed pressurized system absorbing heat? Can you use a pressure release valve to maintain a certain pressure and slow the process of LN2 becoming Hydrogen? How long would it take for 1 litre of LN2 to become gas in a open system? How long in a pressurized system with a release valve? If you used LN2 to absorb heat can you slow it from becoming a gas without a compressor?

Thanks in advance.

2007-03-15 09:18:35 · 2 answers · asked by PAKHAN 2

In physics we were told that gravity pulls up down and that a chair for instance pulls up and that the forces balance each other out buy how can a chair have a force i find this a little confusing. Can any1 help?

2007-03-15 09:14:26 · 7 answers · asked by Anonymous

A glass cylinder contains 1 mole of water under piston.
How can we tell if water is in gaseous, liquid or solid state,
if we are allowed to use any measurement instrument?

2007-03-15 08:52:05 · 8 answers · asked by Alexander 6

most metsals are good conductors because
large number free electrons
high melting point
molecules close together
many intermolecular spaces which current can flow

whick must exist between 2 points in a conductor in order to maintain a flow of charge?

2007-03-15 08:46:32 · 5 answers · asked by Anonymous

I need an answer that has something to do with chemistry, physics, or other branch of science. I definitely need an answer that sounds "very intelligent".

2007-03-15 08:40:02 · 10 answers · asked by Holly S 1

Does the book or theory explain how the graivity force particle interacts with the other force and energy particles?

2007-03-15 08:37:51 · 3 answers · asked by Uncle Remus 54 7

2007-03-15 08:37:37 · 3 answers · asked by Anonymous

I have read about it, but for some reason I can't grasp the concept. Can someone explain it is laymans terms (and I am REALLY a layman).

2007-03-15 08:32:07 · 5 answers · asked by Anonymous

the excited atoms in the laser medium. If you were to send some of the right color of light through the laser medium from the side of the laser.. What around the laser medium do?

2007-03-15 08:30:38 · 2 answers · asked by Kelly P 1

This is for my physics class. I think that it stabilizes the balloon when it propels it self in the air, but I am not sure.. Any thoughts?

2007-03-15 08:19:03 · 2 answers · asked by Anonymous

Four children running alongside push tangentially along the platform's circumference until, starting from rest, the merry-go-round reaches a steady speed of one complete revolution every 2.8 s.

(a) If each child exerts a force of 26 N, how far does each child run?
m
(b) What is the angular acceleration of the merry-go-round?
rad/s2
(c) How much work does each child do?
J
(d) What is the kinetic energy of the merry-go-round?
J

2007-03-15 08:17:03 · 1 answers · asked by Anonymous

Say you are sitting in the last car of a 300m long train that is about to leave a station. Assuming that all the cars are rigidly joint, as soon the engine starts moving you get that information - that the train started moving - instantaneously. Now consider a rigid wire 300,000 km long that you are holding up at one of its ends. As soon as some one pulls the wire at the other end you will notice it instantaneously as well, the information flowed at >>300,000 km/sec.
If the piece of wire was N-times longer than that, the information that someone is pulling it at the far end would have traveled N-times faster than the speed of light.
Conclusion:
The speed the information that travels from point A to point B does not depend upon the space-time parameters because the speed of ligth is no longer a border condition.
This makes sense on the application of Ruppert Sheldrake's theory about the Morfogenetic Fields.

2007-03-15 08:10:21 · 5 answers · asked by Anunnaki 1

A. It depends only on its intake temperature.
B. It equals the difference between its heat intake and heat exhaust.
C. It depends only on its exhaust temperature.
D. It equals its heat intake.

2007-03-15 08:03:48 · 4 answers · asked by ShyGirl 1

2007-03-15 08:03:02 · 3 answers · asked by tinal22 2

Relative to their original average energy, what is the new average energy of the molecules?

A. four times as great
B. twice as great
C. half as great
D. the same

2007-03-15 07:59:22 · 4 answers · asked by ShyGirl 1

A. 240 kg/m3
B. 267 kg/m3
C. 469 kg/m3
D. 375 kg/m3

2007-03-15 07:57:05 · 3 answers · asked by ShyGirl 1

its temperature must be changed to which of the following?

A. 800 K
B. 100 K
C. 400 K
D. 1600 K

2007-03-15 07:55:42 · 1 answers · asked by ShyGirl 1

During a throw an athlete exerts a net average torque of 100 Nm on a discus
about its axis of spin. The mass of the discus is 2 kg and its radius of gyration
about its spin axis is 12 cm. If the discus was not spinning at the beginning of
the throw and the throwing action lasts for 0.2 s, calculate how fast (in
radians s-1) the discus is spinning when it is released.

2007-03-15 07:51:33 · 2 answers · asked by Zoolander 1

What was the initial angular velocity of the wheel before braking began?

2007-03-15 07:50:31 · 1 answers · asked by Anonymous

A boy of mass 23 kg sits on a seesaw 1.5 m from the axis of rotation. At what
distance from the axis of rotation must his friend, whose mass is 21 kg, be
positioned to balance the seesaw?

2007-03-15 07:49:07 · 3 answers · asked by Zoolander 1

(a) After 7 s, what is its angular velocity?
correct check mark rad/s
(b) Through what angle has the wheel turned?
rad
(c) How many revolutions has it made?
rev
(d) What is the speed of a point 0.7 m from the axis of rotation?
m/s
What is the magnitude of the total acceleration of the same point?
m/s2

2007-03-15 07:48:52 · 1 answers · asked by Anonymous

Do you think scientist will formulate different theories about the origin of the universe in the future?

2007-03-15 07:43:55 · 5 answers · asked by MandyBaby 1

2007-03-15 07:36:58 · 7 answers · asked by Alexander 6

2007-03-15 07:32:37 · 3 answers · asked by Anonymous