Physics - July 2007

I was just wondering if anyone knew where the 'horizontal eight' symol for infinity originate/come from? Thanks in advance!

2007-07-28 22:11:56 · 1 answers · asked by The Fine Flu 3

We have to build a device for science which will increase the speed which an ice cube melts. The focus is radiation, conduction and convection.

2007-07-28 21:15:45 · 11 answers · asked by Anonymous

In physics one often models a system using linear equations...not because the system IS linear, but because these equations can be solved!
Isn't this a fatal flaw?...wouldn't physicists be better off doing Economics? At least everyone knows that it is a deceit

2007-07-28 20:49:21 · 13 answers · asked by Anonymous

Interesting reading about Tesla. He created "free energy" and the government shut him down (for lack of a better term) I'd like to get your opinions on the subject.

Every so often, you hear about someone creating cold fusion in their kitchen or bath tub and as soon as you hear about it, the/that story disappears.

Your thoughts or experiences please ?

2007-07-28 20:04:09 · 5 answers · asked by Anonymous

In the equation of velocity
v = d(x)/d(t)
what r the conditions to make velocity (v) = 0?

2007-07-28 20:02:10 · 8 answers · asked by rajesh bhowmick 2

I am in a Physics class and I need to get an answer for this question. Can somebody please help me out?

2007-07-28 18:39:50 · 2 answers · asked by ursolastsummer! 2

Plz help me thx..

1) what is the impulse due to a force rthat causes the speed of a 46 g golf ball to change from 0 to 60.0 m/s in 0.50ms?

2) A 0.250 kg ball of Plasticine moving 5.0 m/s overtakes and collides with a 0.3000 kg ball of Plasticine, traveling in the same directiion at 2.0 m/s. The 2 balls of Plasticine stick together pm collison. What is their speed after the collision.

3) A 4.2 kg rifle shoots a 0.05 kg bullet at a speed of 3.00 * 10^2 m/s. At what speed does the rife recoil?

4) A railroad car of mass 12,000kg is traveling at a speed of 6.0 m/s when it collies with an identical car at rest. Thte two cars look together. What is their common speed after the collision?

5) What impuse is needed to change the speed of a 10 kg object from 1.6 m/s to 25.5 m/s in a time of 5s. How much force is needed?

It would be awesome to show the steps...
Once again, ty so much.........

2007-07-28 18:34:36 · 4 answers · asked by Anonymous

We've had this technology since Tesla discovered it. The Navy started dabbling with the "Philedalphia Experiment."
Why do the Governments continue to withhold this information?
http://rds.yahoo.com/_ylt=A0oGkmiTG6xGflgAInBXNyoA;_ylu=X3oDMTExZnBsOTUwBHNlYwNzcgRwb3MDNQRjb2xvA3NrMQR2dGlkAwRsA1dTMQ--/SIG=11c01oguu/EXP=1185770771/**http%3a//www.zpenergy.com/

2007-07-28 17:47:01 · 10 answers · asked by Honey Girl 3

the horizontal, how far will the water reach neglecting air resistance?
treat the the water as u would an individual object.
(hint: use your vector skills to break the velocity into its two components: the amount of velocity acting straight upwards will ditermine how long the object is in the air, the componient acting, the componient acting horizontally wiill ditermine how far it travels in that time)

2007-07-28 17:06:32 · 2 answers · asked by xplicit 2

In theory, of course.

2007-07-28 16:59:59 · 4 answers · asked by pianotime 3

Some were 20+ floors below the collapse point witch was falling at free fall speed.
If you disagree with the speed than lets just assume it was slightly less than free fall speed. Either way there was little or no resistance.
So what caused the squibs?

2007-07-28 15:27:59 · 6 answers · asked by Anonymous

2007-07-28 15:19:06 · 4 answers · asked by Anonymous

3^n + ^6^n
-----------------
10^n

2007-07-28 14:48:30 · 2 answers · asked by Anonymous

2007-07-28 11:03:11 · 10 answers · asked by Anonymous

2007-07-28 11:00:21 · 8 answers · asked by Anonymous

I imagine we'd have less wrinkles as we age.

2007-07-28 09:24:01 · 5 answers · asked by Anonymous

so sound is the vibration of air, and air does have mass. The question is what will happen to sound if the the mass of air increases??

2007-07-28 09:16:21 · 3 answers · asked by      7

If the Sun and the Moon are responsible for the tides on the Earth, why don't I see tides on a glass of water left untouched on the kitchen counter for 24 hours? Shouldn't my glass of water show the effects of the gravitational pull of the Moon and the Sun, just like the oceans?

2007-07-28 08:54:10 · 7 answers · asked by LJ 2

A battery having an emf of 10.60 V delivers 102 mA when connected to a 60.0 ohm load. Determine the internal resistance of the battery.

How do I solve this?

2007-07-28 08:48:27 · 4 answers · asked by protege moi 3

I need a time machine, to travel through time. I know the law of physics would not allow it. But, everything is possible with science.

2007-07-28 08:09:56 · 18 answers · asked by dinesh@coolbuddy 1

2007-07-28 08:06:24 · 1 answers · asked by fatty fatty fatty 1

The space shuttle produces 1 million foot pounds of torque and 37 million horsepower, the saturn 5 that took the astronauts to the moon had 7.5 million foot pounds of torque and 160 million horsepower. Why did the saturn 5 have more power? Was if because of weight?

2007-07-28 07:54:57 · 3 answers · asked by Anonymous

does anyone know how to levitate at an impossible angle with only one foot on the ground. if so please tell me. are there any gimmicks to this illusion?!

2007-07-28 07:44:08 · 2 answers · asked by Anonymous

particle is moving in circular motion such that its normal and tangential accelerations are equal. find the velocity of the particle after moving a distance s

2007-07-28 07:33:37 · 5 answers · asked by sameerteacher01 1

2007-07-28 07:16:24 · 4 answers · asked by ROCO 2

a particle is moving on a circular path such that tangential acceleration is equal to the normal acceleration. at time t=0 velocity is u find the velocity after time t

2007-07-28 07:14:47 · 5 answers · asked by sameerteacher01 1

2007-07-28 07:09:39 · 16 answers · asked by fatandsmooth 5

When I was a kid I used a magnifying glass to burn paper. Rather than using solar energy from Photovoltaics, wouldn't the magnifying glass allow you to boil lots of water and turn the same turbines our coal powered plants do today?

2007-07-28 06:39:44 · 9 answers · asked by andrewfromfly 1

please help me to understand the importance of gear reduction.

2007-07-28 06:06:23 · 2 answers · asked by Ashwini V 2

didn't astronomers or scientists found anything travels faster than light?What is it? and how much faster? does that destroy relativity?

2007-07-28 05:14:19 · 18 answers · asked by carspare 2