Physics - December 2007

Did they need to adjust it at all? My book says the uncertainty of the speed of light is 0. I find it hard to believe that the standard meter was exactly 1/299,792,458th already.

Was an adjustment of a few nanometers in one direction or the other required?

My brother wants to know, also.

2007-12-24 08:38:40 · 5 answers · asked by Anonymous

2007-12-24 08:36:55 · 8 answers · asked by Anonymous

What happens to the voltage and current when you have two sources in series, and one of them is reversed. Why.

I really don`t understand this, I would really appreciate if someone could explain it to me.

2007-12-24 08:36:37 · 3 answers · asked by Anonymous

Two small blocks each of mass M, are connected by a string of constant length of 4h and negligible mass. Block A is placed on a smooth tabletop, and block B hangs over the edge of the table. The tabletop is a distance 2h above the floor. Block B is then released from rest at a distance h above the floor at time T=0.

Q's:

Determine the acceleration of block B as it descends.

Block B strikes the floor and does not bounce. Determine the time at which block B strikes the floor.

There are many more questions but I do not understand the ones above. Please help :)

2007-12-24 08:34:01 · 2 answers · asked by Anonymous

A 1kg ball hits a surface perpendicularly with a speed of 3m/s and bounces back with a speed of 2m/s. The ball undergoes a change in momentum of
1) 1kg*m/s
2) 5kg*m/s
3) 3kg*m/s
4) 6kg*m/s
Explain~

2007-12-24 08:11:31 · 1 answers · asked by Sanny 1

Angstom ... Lumen ... Lux or ... candela

2007-12-24 07:52:42 · 2 answers · asked by baby_94338 1

2007-12-24 07:17:28 · 6 answers · asked by glennandkaren@sbcglobal.net 1

Can someone please solve these step by step?
How many electrons would be required to have a totalk charge of 1.00C on a sphere? assuming the force between 2 spheres is 48 N, what will be the magnitude of the force if the distance between them is doubled?

2007-12-24 06:53:47 · 5 answers · asked by Anonymous

2007-12-24 06:37:31 · 6 answers · asked by Shenanigans Mahone OHooligan 2

the space between objects in a vaccum have a property that exerts a attractive force?
In your answer please keep in mind that I am what one would call a lay person as I lack a formal education.

2007-12-24 06:30:58 · 6 answers · asked by Anonymous

2007-12-24 06:26:44 · 6 answers · asked by SaiYasodharan 2

Objects of masses m1 = 4.00 kg and m2 = 9.00 kg are connected by a light string that passes over a frictionless pulley . The object m1 is held at rest on the floor, and m2 rests on a fixed incline of = 40.0°. The objects are released from rest, and m2 slides 1.00 m down the incline in 4.00 s.

a) Determine the coefficient of friction between m2 and the incline.

b) determine the tension in the string

2007-12-24 05:56:01 · 4 answers · asked by rachhar123 1

I mean outside,(that might sound obvious but there are ppl that would give silly answers)

2007-12-24 05:43:32 · 11 answers · asked by Anonymous

I know Calc 1 is the prereq but I already have taken Trignometry, Algebra, and Algebra based Physics. I got a B in all classes. How hard would it be?

2007-12-24 04:57:33 · 5 answers · asked by Anonymous

2007-12-24 04:28:19 · 13 answers · asked by Sherlock 6

If we take a charged particle say..protons..highly energetic and with extreme speed we fuse it with U-253 at extremely high pressure ant temperature will it release an extraordinarily high energy radiations which can generate energy equivalent to the energy released during the Big Bang??

2007-12-24 04:22:48 · 10 answers · asked by Anonymous

1. What two things is Science said to be. Make sure you understand both of the definitions.

2. Understand the term Microgravity and how the term is sued.

3. Understand and define the steps in the Scientific method.

4. Understand the terms of measurements such as mass, length, volume, time, and temperature and what items are used to measure these terms.

5. Understand the Metric System and what increment of measurement it is based on.

6. Understand how to measure with a Triple Beam Balance.

7. Understand how to measure with a Graduated Cylinder.

8. Know how to read a thermometer.

9. Know how to measure with a Meter stick.

10. Understand what makes a hypothesis a law.

11. Understand how light waves and water waves are different?

12. Understand the age of stars, and how to determine the relative age of a star. (color, size, etc.)

13. Understand the difference between the three different types of galaxies.

2007-12-24 04:16:31 · 16 answers · asked by Stop Abusing the Report Button! 2

.. on economy?

2007-12-24 04:02:55 · 12 answers · asked by Anonymous

A building is in motion after being impacted, and is leaning; since to stop an equal force requires an equal force, of equal mass, according to Newton's 3rd Laws of Physics, and you do not have an equal sized building to stick in the way of the falling building, do you stop the building in motion with a compression resistant or a tension resistant object?
And how.
There is an answer to this.

2007-12-24 03:52:47 · 2 answers · asked by Anonymous

A solid of density 5000 kg/ m3 weighs 0.5 kgf in air. It is completely immersed in water of density 1000 kg/ m cube. Calculate the apparent weight of the solid in water. What will be its apparent weight if water is replaced by a liquid of density 8000 Kg/m3?

Guys please help me solve this.....the answers are:
1... 0.4 kgf
2...Zero

Though I know the answer I still need to know how it works....please help me!

2007-12-24 03:32:49 · 2 answers · asked by shweta 2

is it normal to be like that?

2007-12-24 03:17:22 · 7 answers · asked by I take your piggy bank! 1

Light moving toward it is surely faster than the constant we use for lightspeed? So.. Darkspeed?

2007-12-24 02:28:15 · 11 answers · asked by Anonymous

Aren't you travelling TO somewhere at the same speed? Wouldn't that balance it out????

2007-12-24 02:19:03 · 7 answers · asked by Anonymous

Small particles have smaller particles in orbit around them. Doesn't it follow that we are but a small particle floating around another massive one?

2007-12-24 02:17:44 · 6 answers · asked by Anonymous

May not be the barrier we all thought it to be?

2007-12-24 02:14:17 · 7 answers · asked by Anonymous

2007-12-24 00:33:07 · 2 answers · asked by zoom 1

a lot of people are saying its impossible.
a lot of people said it was impossible to go to the moon or travel at the speed of sound also.

what do you think about this idea, take a motor and a altinator and hook them together. but using different sized pullys.
such as a 1/2 pully on the altinator and a 10 or 25 inch pully on the motor thus giving it a ratio of turn of= 20 turns or more on the altinator to one turn of the motor.

you see my point. and what about magnets as seen on youtube .

BEFORE YOU ANSWER THIS QUESTION LOOK AT THE VIDEO'S FOUND IN YAHOO SEARCH UNDER MAGNETIC ENGINES.

and try to keep a open mind. thanks.

and yes ive read the laws on this. but i disagree, becuase of the moving parts that could have a huge impact on the laws of perpetial motion.

2007-12-23 22:52:13 · 8 answers · asked by jason h 2

At the Great Sand Dunes National Monument in Colorado, the visitors' centre has a Trombe Wall. The wall is designed for passive solar energy collection. The air in the air gap is heated during the day by sunlight. This in turn heats up the masonry wall. The heat energy is then transferred to the visitors' centre at night.

The visitors' centre is in desert landscape. Suggest what could be done to stop the system overheating when the outside temperature gets too hot. Explain your answer.

2007-12-23 21:40:51 · 4 answers · asked by Anonymous

2007-12-23 20:55:51 · 1 answers · asked by Tomás G 1

2007-12-23 20:24:23 · 8 answers · asked by Anonymous