Physics - April 2007

OK. Say you have a wire hooked up to a battery, and you hook that up to a metal coin. The coin will conduct electricity, the charge can flow through it. If you hook the same apparatus up with somthing such as a bagel, or other non-metalic or non-conducting object.. can that object ever conduct electricity? If enough current is pumped? Or somthing?

2007-04-19 19:32:14 · 3 answers · asked by Burgundy 2

gravitaitonal forces and electromagnetic forces

2007-04-19 18:01:21 · 5 answers · asked by stayin alive 2

Ok. Follow my thinking on this.

We can see infared... yes it's a form of light, but isn't light a form of a radio wave?

We use metal detectors to find metal. So why can't we shoot out the same wave and read it back in using a type of lens then convert that to a picture on a screen?

Something like this would be the greatest thing on Earth to the soldiers in Iraq. It could see wires inside of objects to spot IEDs at a distance.

I'm sure there is something wrong why we can't do this, so I'm just asking what that something is.

Thanks.

2007-04-19 17:08:45 · 7 answers · asked by Anonymous

Physics has not given the exact cause of most of the natural incidents that happens in this world. To explain, take the example of a car. Car can make us move due to the powerful engine it contains. But that is not the primary cause a car can move. A living being has sit inside the car and drive it. Human beings have not yet designed anything that can drive the car safely, smartly and happily. In other words, the mechanics present inside a car alone cannot make a car to move. A living being has to be present to move it. Now let us move to the natural incidents. For example, there is lightning, thunders and during rainy seasons. Physics give reasons for this but it is not giving the primary cause for this incident. The primary cause is not given by the science. If something is happening systematically, there are 3 causes:The material cause, Instrument cause and Cause due to the Desire- continued below-

2007-04-19 16:31:20 · 6 answers · asked by shiva prakash 1

Hey guys I was wondering if any of you know how to solve this physics problem about forces. Any help ASAP would be greatly appreciated :)

Joe drives his 1600 kg car to work at a speed of 108 km/h (30 m/s). When the road is dry, the coefficient of kinetic friction between the pavement and the tires on his car is 0.80. When the pavement is wet, the coefficient of kinetic friction is 0.50. Determine how much farther it takes his car to come to an emergency stop when the pavement is wet than when it is dry.

??

2007-04-19 16:09:49 · 2 answers · asked by Shaun S 1

Ellen travels in her convertible at an average speed of 27m/s between Hamilton and London. It takes her 1.4h to travel the distance. How far(distance or displacement) in kilometre does she travel?

2007-04-19 15:13:40 · 2 answers · asked by dundundun 1

when a charged vinyl strip is brought near an uncharged pith ball electroscope, the pith ball is first attracted and then repelled, explain.

2007-04-19 14:43:06 · 1 answers · asked by tmacfan1121 2

A 750 gram grinding wheel 25 cm in diameter is in the shape of a uniform solid disk. When it is in use, it turns constant 220 rpm about an axle perpendicular to its face through its center. When the power switch is turned off, you observe that the wheel stops in 45 sec with constant angular acceleration due to friction at the axle. What torque does friction exert while this wheel is slowing down?

2007-04-19 14:06:05 · 2 answers · asked by pookie 1

A 2.3 cm thick bar of soap is floating on a water surface so that 1.6 cm of the bar is underwater. Bath oil of specific gravity 0.40 is poured into the water and floats on top of it. What is the depth of the oil layer when the top of the soap is just level with the upper surface of the oil?_______cm

2007-04-19 13:09:14 · 1 answers · asked by priscilla 1

2007-04-19 12:12:34 · 2 answers · asked by Ashley Wantana 1

same thing with throwing a ball up

2007-04-19 10:58:25 · 8 answers · asked by bulletprooflonliness 4

1calculate the total force of the atmosphere acting on the top of a table that measures 1.6m x 1.9m.
(b) What is the total force acting upward on the underside of the table?
2.What is the total force and absolute pressure on the bottom of a swimming pool 22.0m by 12.0m whose uniform depth is 2.om? What will be the pressure against the side of the pool near the bottom?

2007-04-19 10:45:42 · 1 answers · asked by petite fille 2

Recently in my physics class we were discussing the speed of light... My question is if the speed of light slows down when it eneters a new medium (such as water form air) and then speeds up again when it hits air... how slow can the speed of light go? I know that if the speed of light is the fasting thing (even if you disagree, just say it is for these questions) then when the light speeds up agian when it hits air it can't reach speeds over that of light...(duh?) But are there any scientists who have made the speed of light decrease so much that you could acually watch the light travel through the air? Even if not how slow has it been made to travel? I would like any information on this...(recent information...) and preferably reasearch to back yourself up...like a website...thank you!

2007-04-19 10:42:09 · 8 answers · asked by Anonymous

Thanks for the answer!

2007-04-19 10:40:51 · 5 answers · asked by Anonymous

Why does everybody think that physics topics like quantum mechanics and relativity are so hard to understand? Its like a stereotype that you have to be a college Ph.D physicist to understand quantum mechanics, but its not true. I know at least three people that know a lot about wave interference and stuff like that. Why does everybody think this way?

2007-04-19 10:19:44 · 6 answers · asked by The Ponderer 3

2007-04-19 10:15:14 · 9 answers · asked by Anonymous

i was at greenville, sc and i was listening to the radio and i was able to pick WCBS 880 AM how is that possible?

2007-04-19 09:49:27 · 4 answers · asked by latincaz 2

2007-04-19 09:41:53 · 8 answers · asked by Anonymous

Imagine yourself in a car traveling around a sharp curve. The " centripetal" force is inward, yet why do you slide outward and not inward?

2007-04-19 09:19:08 · 2 answers · asked by d_u_guy 1

No, I'm not taking a test for school or anything, I just made this quiz myself and I want to see how much the average person knows about it.

ABSOLUTE ZERO QUIZ
1. Why is it impossible for physicists to reach absolute zero?
2. What temperature scale do physicists use to refer to low temperatures?
3. How close to absolute zero can physicists get?
4. What tool do physicists use to cool atoms so close to absolute zero?
5. What is Bose-Einstein condensation?
6. What is a superconductor?

Remember: The first person to get all questions correct gets Best Answer!

2007-04-19 09:12:08 · 7 answers · asked by Superconductive Magnet 4

OK, I've been fascinated for months by Eric Lerner's Focus Fusion proposals, but I have a nagging feeling that his status as an anti-Big Bang "crackpot" and a vain self-promoter mean that his credentials and therefore his plan are highly flawed.

I don't know enough physics to fully critique the overall design, but I can't find any obvious problems. So here are the links to the site and the white papers that I hope will be enough for someone with a Physics background to comment on.

http://www.focusfusion.org
http://www.physicsessays.com/doc/s2005/Lerner_Transparencies.pdf
http://lawrencevilleplasmaphysics.com/PROSPECTS_FOR_P11B_FUSION.htm

2007-04-19 09:03:39 · 2 answers · asked by John F 3

Which is stronger, Gravitational or Magnetic forces? A small magnet is able to lift a nail. Lifting is done against the gravitational force.

2007-04-19 07:11:12 · 11 answers · asked by adm2576 2

2007-04-19 07:09:37 · 2 answers · asked by Dat Le 1

u know...like yesterday after a birthday party we let go all the ballons at once. then i was wondering what happens to the balloons in space. does it burst? y? and what happens to the rubber pieces?

2007-04-19 07:04:22 · 8 answers · asked by sαrαн♥mıss ©υяlz 3

I need to find out the calculations for rocket launching. The following are the calculation equations i need.

estimation of flight pattern
-rocket weight
-fuel burning duration
-estimated height
-wind direction effects
-recovery route

If you know please post. If there is a website that you know could help me out please post that as well. Thank you!

2007-04-19 06:32:36 · 3 answers · asked by A QUESTION 2

2007-04-19 06:30:33 · 3 answers · asked by offokansi c 1

2007-04-19 06:30:33 · 5 answers · asked by michael s 1

power its--and +there is only two ways to go .

2007-04-19 05:54:40 · 10 answers · asked by sehoy 3

When something explodes, pieces go in many different directions and keep traveling in different directions. However when fireworks explode in the night sky, the pieces hold their shape in a near perfect circle until they fall to the earth...how is this possible? It seems to defy the laws of physics. I have never taken a physics class, by the way. Serious answers only, please.

2007-04-19 05:53:09 · 6 answers · asked by CrabFisherman 1

2007-04-19 05:53:05 · 11 answers · asked by gilhabime 1