Physics - November 2006

2006-11-17 13:50:43 · 15 answers · asked by Pierre G 1

The laws of the universe can't be broken, but I thought it all happened when a ball of mud in space exploded...

How to you get rules from random chaos?

2006-11-17 13:49:47 · 7 answers · asked by deltaxray7 4

2006-11-17 13:48:21 · 2 answers · asked by Tiffany W 1

2006-11-17 13:48:19 · 6 answers · asked by Pierre G 1

2006-11-17 13:43:43 · 5 answers · asked by Pierre G 1

2006-11-17 13:28:55 · 5 answers · asked by Jen V 1

If plasma (4th stage of matter) can be controlled by thermo, magnetic or electro fields, just what are examples of how it's done by/with each?

I'm trying to understand practical (even theoretical) applications for plasma but with a little bit of a layman's explanation. Not just the "what" but a brief explanation of the "how."

I'm also wanting examples in labs or controlled environments, not outer space. Thanks!

2006-11-17 12:58:05 · 2 answers · asked by Playswithmatches 1

tritium and deuterium fuse to form helium, thus ejecting a neutron, this neutron is suppose to turn into energy, but how?
i already know about E=MC^2, but i also know that neutrons only become energy when it comes into contact with an anitneutron, and none of these antineutrons exist here on earth with normal matter, so how can the neutron turn into energy?

2006-11-17 12:41:27 · 9 answers · asked by some guy 2

An equal force F is exerted by C on B (angle ABC = 90 degrees). What is the net force on B???

2006-11-17 12:07:22 · 1 answers · asked by Arnold M 1

you jump from a diving board with a horizontal velocity of 3.5 m/s. If the diving platform is 6.0 above the water at what horizontal distance from the platform will you hit the water.

2006-11-17 11:38:28 · 4 answers · asked by yoo whoo 1

So, this is a physics question I'm having some serious trouble with, help would be appreciated. Here's the question in all its detail:

A vibrating 400Hz tuning fork is placed in pure distilled water.
a) What are the frequency and the wavelength (in metres) of the sound waves produced within the water at 0 degrees C?
b) What would be the frequency and the wavelength in the adjacent air, if the sounds waves moved from the water into the air at 0 degrees C?

That's the question, I got the second half already...I think, but I can't figure out a) at all.

The equations we have are :
frequency = cycles/time
Period = time/cycles
Speed = frequency x wavelength
Speed = distance/time
Speed of Sound in Air = (332+(0.6xTemperature))

I have the answers in my text if anyone could get anywhere backwards.

Any help would be much appreciated.

2006-11-17 10:47:54 · 3 answers · asked by SeriouslyNow 3

A ball is rolled off of a building that is 5m tall. Will the ball go over a wall that is 20m away and 2m tall? or will it hit the wall? Basically the question is how far from the ground will the ball be after traveling 20m.
V= 31.25 m/s

Show all work please.

2006-11-17 10:44:40 · 2 answers · asked by cloudykisses36 1

Water ( density = 1000kg/m^3) falls without splashing at a rate of 0.111 L/s from a height of 24.2m into a 1.07 kg bucket on a scale. The accelaration of gravity is 9.8m/s^2.

If the bucket is originally empty, what does the scale read after 4.22 s? Answer in units of N.

2006-11-17 10:20:45 · 5 answers · asked by invu 1

A 655g ball strikes a wall at 14.9 m/s and rebounds at 13.4 m/s. The ball is in contact with the wall for 0.034 sec.
What is the magnitiude of the force acted on the ball during the collision? Answer in units of N.

2006-11-17 10:16:22 · 2 answers · asked by invu 1

A 2,500-kg car hits a fence with a force of 400 N, and the collision takes one second. What is the impulse?

I think the answer is 6.25 kg-m/s but am not sure. Can anyone clarify this for me?

2006-11-17 10:09:17 · 1 answers · asked by BadRomance 2

2006-11-17 09:41:12 · 3 answers · asked by Tatty 1

a slingshot consists of light leather cup containing a stone that is pulled back against two rubber bands. it takes a force of 30.0 N to stretch the rubber bands to 1.00 cm. what is the potential enger stored in the bands when a 50 g stone is placed in the cup and pulled back 20 cm from its equilibrium position? with what speed does the stone leave the slingshot?

2006-11-17 09:11:32 · 1 answers · asked by Amanda R 2

A ray of light, a bunch of photons, hit a commom mirror, made of glass and a silvery paint behind. What happens then? Why the photons bounce back? Why the photons are not absorbed by the surface of the mirror? Why they bounce back in right angles?
Use mathematics if you want.

2006-11-17 09:10:47 · 4 answers · asked by silvafilho 1

physics homework, i need the steps to get through this?
a merry go round rotates at a .20 rev/s with a 80kg man standing at a point 2.0 m from the center. if he moves to a point 1.0 m from the center, what will be the new angular speed of the ride?
how much does the rotational kinetic energy change during the motion? assume the ride is a uniform solid 25 kg cylinder and its radius is 2.0 m and that the man can be modeled as a uniform solid sphere for moment of inertia measurements?

2006-11-17 09:09:14 · 1 answers · asked by Amanda R 2

A 35 G toy car going right at 5 m/s has an elastic head on collision with a 30 g toy car going left at 3 m/s. After the collision, what are their velocities? (Speed and Direction)? ANy help would be useful. I set up 2 equations and used a substitution mehoid to solve but have no clue if i'm right. These equations were: A) A) 35( 5 ) - 30( 3 ) = 35V + 30(V2) and B ) 1/2 (35)( 5 )^2 - 1/2(30)( 3 )^2 = 1/2(35)( V )^2 + 1/2(30)(V2)^2

2006-11-17 09:04:51 · 2 answers · asked by ncaafan2 2

2006-11-17 08:35:22 · 2 answers · asked by B 1

2006-11-17 08:28:04 · 5 answers · asked by quantum 1

2006-11-17 08:08:44 · 2 answers · asked by ponco p 1

i need this explained step by step, im not concerned about the answer,
a uniform rectangular sign is suspended horizontally from two cables, one attached at the left end, the other attached .250 from the right end. the mass of the sign is 3.00 kg and its length is 1.00 m. find the tension in each cable.

2006-11-17 08:01:45 · 3 answers · asked by Amanda R 2

A particle P, moving along a straight line with constant acceleration 0.3m/s^2 passes a point A on the line with a velocity of 20m/s. At the instant when P passes point A, a second particle Q is 20m behind A and moving with velocity of 30m/s. prove that unless the motion of P or Q changes they will collide

2006-11-17 07:59:52 · 4 answers · asked by Jezza 2

physics

2006-11-17 07:53:39 · 8 answers · asked by laurierodriquez 1

if a rock is dropped down a well, and is heard 16 seconds later, how deep is the well in metres? The speed of sound is 345 m/s. Could someone plead explain to me how to figure this out (full solution) Thank you very much!

2006-11-17 07:07:10 · 11 answers · asked by Anonymous

At what distance from the center of The Earthwould the acceleration due to gravity be equal to half of its value at the surface of the Earth, g=9.81 m/s^2? Please show how you get your answer/your thought process or whatever. Thank you in advance!

2006-11-17 07:02:07 · 4 answers · asked by JitterBug589 3

The intensity of the sunlight that reaches Earth's upper atmosphere is approximately 1400 W/m2.

What is the intensity of sunlight incident on Mercury, which is 5.7e10 m from the Sun?
Answer in W/m^2

2006-11-17 06:55:58 · 3 answers · asked by pauk M 1

2006-11-17 06:49:36 · 3 answers · asked by Michael E 1