Physics - December 2007

-

2007-12-13 22:43:46 · 2 answers · asked by Anonymous

2007-12-13 22:23:28 · 14 answers · asked by jeenie 1

Ok so here is my thinking...

Scientists can study an atom and predict exactly how it will react/behave in the next second.

If there was a computer powerful enough to know exactly what every atom in the entire universe was doing then would it also be reasonable to assume that a sufficiently powerful enough computer would then be able to predict exactly what would happen next EVERYWHERE? Does this argue the point that there is no such thing as freewill and that our lives are mapped out for us?

2007-12-13 21:37:57 · 9 answers · asked by BlackbeltJudoJim 2

Why doesn't light travel twice as fast as it normally does ?

2007-12-13 21:20:05 · 6 answers · asked by Anonymous

This came to me while I was watching a documentary on Parallel universes and no matter how I think about it it just seems to work.
This universe that we are in now started from a single atom according to the big bang theory but i suggest that the atom didn`t explode but paralleled itself if you know what I mean. Whenever I see or read something on Parallel universes, people talk about the descisions we make and how the universe is split by those descisions but what if the whole universe is made up of parallel universes on a quantum level. What if every atom in the universe today is just Infinate parallels of that first atom. The same atom everywhere at the same time with every descision of that atom played out in this universe.
Just a theory but I think I will try to expand it in the coming weeks.

2007-12-13 19:31:12 · 15 answers · asked by Anonymous

2007-12-13 19:16:13 · 4 answers · asked by neo85888 1

A plane is sitting on a giant treadmill. At time zero, the plane and the treadmill are both stationary. As the plane tries to take off, the treadmill rotates backwards at the exact same speed that the plane is moving.

Does the plane take off?

2007-12-13 17:18:25 · 5 answers · asked by itsmedannyp 2

I am no scientist but I have 2 ideas and id like all of your humble opinions. Why cant we filter out car emmisions 95% or so with a filter and reroute the the airflow to the engine with an auxillary breather. Also I know we have electric cars, and we also have air compression powered vehicles. Both of these work what if we combined the 2 for more power and add and additional 3 gallon diesel tank for even more support and less emissions. 3 gallons vs 15 gallons in a 2 week period is a lot better and less polluting. Please give me some ideas why cant we filter out the current emissions and have additional breathing support for the vehicle. Is my other idea about new car technology plausable.

Also no cynical answers I know its all about oil and money but really are these ideas possible thanks.

2007-12-13 16:53:21 · 4 answers · asked by Anonymous

Can somebody give a good explanation of the relationship between simple harmonic motion and uniform circular motion? Thanks a lot!!!!!!

2007-12-13 15:48:38 · 2 answers · asked by acousticplaya90 1

A 15g bullet strikes a metal plate on an armoured car at a speed of 350m/s. The bullet penetrates the armour 3.3mm before coming to a stop.
a) Calculate the average net force acting on the bullet while it is in the metal.
b) Calculate the average force exerted on the metal by the bullet.


Answers:
a) -2.8 x 10^5N
b) 2.8 x 10^5N

2007-12-13 14:54:53 · 1 answers · asked by Anonymous

In Figure 9-61, block 1 (mass 1.6 kg) is moving rightward at 10 m/s and block 2 (mass 4.8 kg) is moving rightward at 2.8 m/s. The surface is frictionless, and a spring with spring constant of 1160 N/m is fixed to block 2. When the blocks collide, the compression of the spring is maximum at the instant the blocks have the same velocity. Find the maximum compression.

http://i175.photobucket.com/albums/w138/kacortez/hrw7_9-61.gif

2007-12-13 14:51:56 · 1 answers · asked by Anonymous

2007-12-13 14:45:59 · 5 answers · asked by Anonymous

I have been absent for a whole week and the teachers been teaching circular motion. I understand how to find the centripetal acceleration, but for some reason i can't find the period and dont even know the equation because the book doesnt have it!!!

the problem is

A motor 24 cm in diameter rotates at 2400 rpm.

a) find its period. <----- HELP ME!!! my english sucks T.T
b) find its centripetal acceleration

2007-12-13 14:24:04 · 4 answers · asked by jason j 1

The counting rate from a radioactive source is
2600 counts/s at time t = 0, and 4 min later
the rate is 1300 counts/s. What is the half-life of the source? Answer in units of s.

-and-

What is the decay constant? Answer in units
of min^−1

-and-

What is the counting rate after 8 min? An-
swer in units of Bq.

2007-12-13 14:22:43 · 1 answers · asked by Anonymous

2007-12-13 14:08:24 · 1 answers · asked by Rich P 1

2007-12-13 13:48:01 · 2 answers · asked by lacie h 1

due to the laser that scans the bar codes. Are they harmful if you're by them all day long...like for a cashier?

2007-12-13 13:31:59 · 1 answers · asked by galactic129 1

2007-12-13 13:31:14 · 2 answers · asked by shared.account 1

The accleration of gravity is 9.8m/s^2. Calculate the depth in the ocean at which the pressure is three times atmospheric pressure. Answer in meters

The density of sea water is 1025 kg/m^3
Atmospheric pressure is about 101,325 Pa



When a 55N stone is submerged in water, the spring scale (which measures apparent weight) reads 45N when attached to the rock. What is the density of the stone. Answer in units of kg/m^3

2007-12-13 12:45:03 · 3 answers · asked by akanthasy 1

I had asked a question earlier about why ice sheets form on creeks and streams trying to ask I would call an ancient question that my stepfather has about why the water level on the stream that runs through his farm is 8to12inches below the actuall sheet of ice formed usually on the edge of the stream extending outward. I guess the real question I have is does the moon have anything to do with this,and is there such things as tides in this area (Wisconsin)?This has been a thing that he has wanted answerd ever since I can remember,and he thinks no one cares when he puts the question out!! It's just that I don't have an answer thats all. Would mean a great deal to me to find out!!! Thanks dreamweaver...

2007-12-13 12:27:45 · 3 answers · asked by dreamweaver 4

A perfectly straight tunnel is drilled trough the Earth, from the North pole to the Equator, as seen in the link (curtesy of "Jack"):

http://s226.photobucket.com/albums/dd11/jackphotos123/?action=view¤t=Cat3b.jpg

Let's say the tunnel is exactly 9020 km long.

The tunnel's floor is flat and coverd with solid Skatelite material.

Bart decides to try his new skateboard in the tunnel.

He stands at the very edge of the tunnel, which is at a 45 degree angle from his skateboard, he slides right in.

Lisa is waiting on the other side with a long rope, tied to a solid tree, 1 km from the hole, just in case.

If Lisa needs to throw the rope in to help her brother out of the tunnel how long a rope would she need?

Is the straight tunnel the equivalent of a 9020 km halfpipe?

Would its "equivalent shape" be the same as the arc of the Earth over the lenght of the hole?

2007-12-13 11:33:11 · 3 answers · asked by Yahoo! 5

I understand that time dilation is when the gravitational pull will change the distance the speed of light is traveling. However, how would this work for a mechanical clock? Say the arms of the clock act as the speed of light and it sits on a strong gravitational pull. Since the arms travel in a circle it would be faster going from the 12 spot to the 6 (since it is moving toward the pull) but slower going from the 6 to the 12 (since it is moving away from pull)? Therefore, evening itself out and there would be no time change, right?

2007-12-13 11:07:54 · 1 answers · asked by battlin_buccos 2

May sound silly but, is space made up of
a)quantifyable parts or
b)completely empty and essentially non-existant?

Presumably answer A signifies a finite universe surrounded by event horizon and B signifies that only matter is finite within a potentially infinate\reoccuring arena?

Does anyone know or are we all just spouting crap?

2007-12-13 10:57:21 · 11 answers · asked by The Will 2 Defy 4

How would it affect our weather? Our natural resources? The mantle of the earth? Earths orbit and rotation? What if lightning hit it? How often would that happen? What if it got hit by a meteor? What if it toppled over? How much would it cost to build? What kind of steel and other materials would we have to use to support all that weight? How big would the foundation have to be? How long would it take to build?
(Forget about the facts that we could not survive being in space because of UV rays, X-rays, no Oxygen, no gravity there, forget all that stuff and lets just say WHAT IF here.) I just want to see what kind of ideas people can come up with.

2007-12-13 10:27:49 · 3 answers · asked by Anonymous

Some researchers believe that the dinosaur Barosaurus held its head erect on a long neck, much as a giraffe does. If so, fossil remains indicate that its heart would have been about 11 m below its brain. Assume that the blood has the denisty of water, and calculate the amount by which the blood pressure in the heart would have exceeded that in the brain. Size estimates for the single heart need to withstand such a pressure range up to two tons. Alternatively, Barosaurus may have had a number of smaller hearts.
Pa

2007-12-13 10:04:28 · 1 answers · asked by Anonymous

How can I calculate the vertical velocity at the end of an objects time interval with Net Force, Mass, Time and Angle given. The question is worded: A net force of 17.0N is applied to a 0.34-kg soccer ball for 0.090s causing it to move off at 28 degrees above the horizontal. Determine the vertical velocity of the soccer ball at the end of the 0.090-s time interval.

Any help is much appreciated!!

2007-12-13 09:59:29 · 1 answers · asked by brushedred99 1

and then carries the block horizontally a distance of 14.60 m.

(a) How much work is done by the person in the process?
(b) How much work is done by gravity in the process?

2007-12-13 09:46:42 · 1 answers · asked by Anonymous

If a train leaves New York at noon going 10E23 MPG and another train leaves France going 12E6 MPG, then how fast will they be traveling when they leave Earth's atmosphere?

2007-12-13 09:35:25 · 1 answers · asked by Brady M 1

A baseball player throws a ball from second base to home plate. He releases the ball from a height of 6 feet on a horizontal path with a velocity of 85 miles per hour. Will the ball reach home plate without bouncing? (or on the "fly") If not, how far away from home plate will the ball bounce? If so, what will be the height of the ball when it gets to home plate?

2007-12-13 09:28:43 · 3 answers · asked by kellibelli7392 1

i have to answers thees questions adn i dnt know them can you help me..here are some moe..


1.The type of radioactive particle that ca be stopper by a sheet of papr is the?

2.The most penetrating type of radioation is the?

3.A helium nucleus with two protons and two nuetrons is called (a)?

4.When the strong force is not sufficent to hold unstable nuclei together permantly?

5.An Intrusment that detects radiation by mean of a superheated liquid is?

2007-12-13 09:10:11 · 3 answers · asked by Anonymous