Physics - March 2007

chris and john are driving around in circles.chris notices that it takes 4.7 secs to make a complete revolution.he also notices his car is just on the verge of sliding sideways. if coeffcient of friction=1.07 for rubber on asphalt ,and the car(and passengers) have a mass of 1500kg, what is the radius of the turn?
the answer is 5.87m

2007-03-29 02:14:20 · 3 answers · asked by Anonymous

different string vibrations make different particles of matter, but what causes different vibrations string makes, a never ending search it seems.......

2007-03-29 02:00:21 · 3 answers · asked by epa51starnet 1

This tunnel runs from one point on the Earth to its opposite point on the other side of the Earth, directly through the center of the planet. I want to know what effects gravity will have on the item. After a while, due to the effects of friction on the item caused by air, I imagine the item would be slowed to a stop. Would it then just float in the middle of the planet in this tunnel? Would it implode on itself due to some weird trick of gravity? The mind boggles...

2007-03-29 01:55:10 · 6 answers · asked by burningranger04 1

A 52.0 µF capacitor is connected to a 52.0 resistor and a generator whose rms output is 30.0 V at 60.0 Hz. Find the following values.

(a) The rms current in the circuit.
Irms = A

(b) The rms voltage drop across the resistor.
VR, rms = V

(c) The rms voltage drop across the capacitor.
VC, rms = V

(d) The phase angle for the circuit.

2007-03-29 01:19:36 · 3 answers · asked by asiansenz 1

2007-03-29 00:48:19 · 11 answers · asked by tinkerbel 2

what is heat, convection, conduction, radiation

2007-03-29 00:44:21 · 8 answers · asked by singervv01 1

If you are traveling in a bike at the speed of light, and now you switch on the head light of your bike. What will happen?

don’t tell me no particle can travel at the speed of light. Every one knows that.

2007-03-29 00:37:38 · 17 answers · asked by steve_reallycool 1

2007-03-29 00:20:17 · 1 answers · asked by Jane 1

2007-03-29 00:14:30 · 5 answers · asked by nicolas 4

Normally depth of focus in a photo shows the foreground blurred, and the distance blurred, with the middle ground in nice clear focus.

But is it physically possible to reverse that effect?
Can a lens put the foreground and background in focus, while making objects in the middle ground look blurred?

2007-03-28 23:35:55 · 2 answers · asked by Swampy_Bogtrotter 4

A 6 ohm resistor, a 54 ohn resistor, and a 32-Q resistor are connected in series. Calculate their total resistance.

*Can you please show it step by step? oh, and what does "Q" stand for?

2007-03-28 20:40:24 · 4 answers · asked by blah 3

a) At what time does the speed of the object reach zero?

t1= ___?__

2007-03-28 20:20:24 · 5 answers · asked by fabulous101 2

Question About Momentum and impulse?
A tennis player swings her 1000 g racket with a speed of 13.0 . She hits a 60 g tennis ball that was approaching her at a speed of 17.0 . The ball rebounds at 45.0 .

1)How fast is her racket moving immediately after the impact? You can ignore the interaction of the racket with her hand for the brief duration of the collision.


2)If the tennis ball and racket are in contact for 13.0 , what is the average force that the racket exerts on the ball?

2007-03-28 20:16:22 · 1 answers · asked by bman7388 1

Evidence of helium was first detected on August 18, 1868 as a bright yellow line with a wavelength of 587.49 nanometres in the spectrum of the chromosphere of the Sun, by French astronomer Pierre Janssen during a total solar eclipse in Guntur, India- From Wikipedia, the free encyclopedia ( in the fields of tobacco, Guntur , HQ of Guntur district, Andhra Pradesh, India) sothern part of india is close to the Earth's Equator, excellent place to carry out solar research in any aspect, Hindu mythology has rich source of slokas about SURYA, the Sun, Ancient Astronomy, Astrology etc., besides other religions. As you are aware that the Sun is the alternate source of energy, needs research but there is no centralised international research on solar energy. it is high time to start International solar research center, there is no place better than India on the Earth.

2007-03-28 19:53:22 · 3 answers · asked by varnha 1

2007-03-28 19:11:09 · 3 answers · asked by Anonymous

2007-03-28 19:00:25 · 2 answers · asked by anuj a 1

2007-03-28 18:50:24 · 1 answers · asked by Azfer A 2

2007-03-28 18:41:11 · 7 answers · asked by Ganbatteru 3

E=mc2

2007-03-28 18:24:42 · 4 answers · asked by Dr. Felterbusch 1

(a) A 6.00 kg object is released 4.8e7 m from the center of the Earth. It moves with what acceleration relative to the Earth? Assume that the objects behave as pairs of particles, isolated from the rest of the Universe.

For that question, my answer is 0.17m/s^2, which is correct but i'm confused about the second part:

(b) A 2.00 e24 kg object is released 4.8 e7 m from the center of the Earth. It moves with what acceleration relative to the Earth?

* I assumed that the mass of the object does not matter when using the equation

g = GM(earth)/R^2

but the assumption is wrong. They do not have the same acceleration relative to Earth although they're released from the same R. Any hints or help please?

2007-03-28 18:19:03 · 2 answers · asked by Anonymous

This does not include helping animals know when to migrate. This question was asked in my Physics class and it has to do with the magnetic north pole I think...

2007-03-28 18:15:56 · 4 answers · asked by Ducky 1

The power required to exert 1 N force, over a distance of 1 m in 1 second is how many watts?

2007-03-28 17:52:20 · 1 answers · asked by cashew 4

how do you find the range, for example in a question like this: a rock is projected horizontally at 15 m/s at a height of 34 m above ground what is the range?

2007-03-28 17:38:22 · 5 answers · asked by skybluu 2

A process occurs in which a system's potential energy decreases while the enviroment does work on the system. Does the system's kinetic nergy increase, decrease, or stay the same? or is there not enough information to tell? Explain?

2007-03-28 17:34:40 · 4 answers · asked by Truong D 1

I'm looking at this problem and I need help with it. By the way the ones who helped me on my last few questions... thanks! I did well on my exam thanks to you!

Problem:

A lamp is located 1 meter below the surface of a lake. Calculate the diameter of the area at the surface which is illuminated lamp, when viewed from above the surface. The refractive index of water is 1.33.

Help!

2007-03-28 17:29:17 · 1 answers · asked by Sir Guitarist 2

My friend and I have been toying with this idea for a long time. He is a little dubious about my asking this online as someone could "steal the idea", but I think if it works, it would have been thought of a long time ago.

The idea is for a solar powered light, which shines on the very solar cells that power it. The sun would power it initially, but when the light shines, it could be removed from the sunlight. Provided that the cells always collected enough power to keep the light on, it would run itself until the bulb needed to be changed.

The question is, could this be done, even on a small scale? I'm a little skeptical that the light would provide enough energy to the cells to keep itself on, especially as solar cells are only 30% efficient or something like that.

2007-03-28 17:14:24 · 8 answers · asked by Odysseus J 3

I have sort of had this explained to me once before, but its still hard to get my head around it.
How does this relate to other stuff as well (in the same vein)?

2007-03-28 17:10:13 · 3 answers · asked by mareeclara 7

CRISIS IN THEORETICAL PHYSICS:
THE PROBLEM OF SCIENTIFIC TRUTH

Temur Z. Kalanov

Home of Physical Problems, Pisatelskaya 6a, 700200 Tashkent, Uzbekistan
tzk_uz@yahoo.com, t.z.kalanov@mail.ru, t.z.kalanov@rambler.ru


Abstract: The problem of truth in science - the most urgent problem of our time - is discussed. The correct theoretical analysis of the generally accepted foundations of theoretical physics is proposed. The principle of the unity of formal logic and rational dialectics is a methodological basis of the analysis. The main result is as follows: the foundations (i.e. classical thermodynamics, the special theory of relativity, quantum mechanics) contain logical errors The existence of logical errors is irrefutable proof of incorrectness of the theoretical foundations and means that theoretical physics enters the greatest crisis. The crisis in physics leads inevitably to the general crisis in science. The crisis as effect is explained by existence of the global cause: the crisis is a collateral and inevitable result of inductive method of knowledge of the Nature.

Keywords: philosophy of science, logic, special relativity, quantum mechanics, quantum statistical physics, thermodynamics.

2007-03-28 17:05:56 · 1 answers · asked by Temur K 1

Which one of these would you choose?
1) Red
2) Yellow
3) Green
4) Blue

It doesn't have to be these four colors but if it or isn't still explain why it is. Mybe because of an old memory or mybe how it makes you feel. How does this color relate to your personality?

2007-03-28 16:41:50 · 10 answers · asked by Beading gal 1

Three toy ducks, attached to each other by a string, are being pulled. The front duck has a mass of 1.0 kg, the second duck has a mass of 5.0 kg, the third duck has a mss of 2.0 kg. If the student pulls them with a force of 10 M and there is no friction, calculate the acceleration, the tension in the string connecting ducks 1 and 2, the tension in the string connecting ducks 2 and 3.

2007-03-28 16:32:55 · 1 answers · asked by Chess 2