Physics (Science & Mathematics) - April 2007

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Why does the electron not fall into the nucleus of the atom?

Why is it that the electron is kept out of the nucleus of the atom. Please don't tell me it is not an allowed energy level becasue i know that. What keeps is from falling to the nucleus and cancelling the positive charge... the electron is minus and the nucleus is plus --so ?? I don't get it .. BTW this is a college chem course so if you have a good answer i really appreciate it.

2007-04-25 16:54:37 · 9 answers · asked by rasdchina 1

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At what angle does the magnitude of the torque have a value?

The figure shows a lower leg being exercised. It has a weight attached to the footand is extended at and angle with respect to the vertical. Consider a rotational axis at the knee

2007-04-25 16:48:43 · 2 answers · asked by mila 2

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What is it called when two forces combine to make a force stronger than the sum of the orginal forces?

Like, for instance, If one guy can left 100 pounds and another guy can lift 150 punds , but together they can lift 300 pounds, whats the called?

this has been bothering me all night, its on the tip of my tounge.

2007-04-25 16:13:04 · 6 answers · asked by dartsarecool9 2

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Please suggest a suitable book for knowing atomic structure.?

I am not a student and want to learn for time pass.

2007-04-25 16:10:39 · 1 answers · asked by deepak57 7

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Momentum problem?

A 70 kg boy sits in a 30 kg canoe at rest on the water. He holds two cannonballs (huh. okay.) each of mass 10 kg. He picks them up and throws them both together over the stern of his canoe (velocity = 5.0 m/s). A 50 kg girl sits in a 50 kg canoe, also at rest on the water. She also holds two 10 kg cannonballs. However she throws them over the stern of her canoe one at a time, each ball leaving her hands with a velocity of 5.0 m/s. Assuming negligible friction between the water and the canoe (a poor assumption), calculate the final velocity of each canoe.

Yeah, long. Can anyone just walk me through the process of solving this? Thanks.

2007-04-25 16:04:51 · 2 answers · asked by Ariel 2

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Unification?

If light is considered both a particle and a wave, then could the position and velocity of an electron both be the same thing? If this were true, then does that mean the universe is everything, infinite, one giant body with a brain or what ever you want it to believe?

2007-04-25 15:52:29 · 2 answers · asked by Anonymous

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Does light itself prove that it comes BEFORE so-called darkness?

Since our shadow doesn't MAKE the Sun shine, yet the Sun shining makes our shadow, doesn't this PROVE that Light always was? It speaks for itself, NO?

2007-04-25 15:48:58 · 8 answers · asked by itsthehold 1

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if a pendulum clock keeps perfect time at the base of a mountain, will it also keep perfect time when?

moved to the top of the moutain? explain

2007-04-25 15:48:13 · 5 answers · asked by lena 1

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Physics Help!?

1) A 24 V battery is connected across two metal plates separated by 0.37 cm. Find the magnitude of the electric field.
2) An ion is displaced through a potential difference of 56.0 V and has an increase of electrical potential energy of 2.00x10^-17 J. Calculate the charge on the ion.
3) The magnitude of a uniform electric field between the two plates is about 1.0x10^6 N/C. If the distance between these plates is 2.0 cm, find the potential difference between the plates.
4) An electron is displaced from a point 46 cm away from a proton to a point 121 cm away from the proton. What is the change in the electrical potential energy as a result of this movement?
5) A point charge of 9.00x10^-9 C is located at the origin. A positive charge of 2.80x10^-9 C is brought in from infinity to a point that is exactly 2.40 cm away from the 9.00x10^-9 C charge. What's the change in electrical potential energy?
6) How can electric potential be high when electrical potential energy is relatively low?

2007-04-25 15:48:03 · 1 answers · asked by Getmeoutofhighschool 2

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april is about to release the bob of a pendulum.?

before she lets go, what sort of potential energy dose the bob have? how dose the energy of the bob change as it swings through one full cycle of motion?

2007-04-25 15:42:57 · 1 answers · asked by lena 1

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Quantum mechanics and the macroscopic world?

Can (do) properties of quantum mechanics (such as uncertainty principle, pauli's exclusion principle, and Feynman's sum-over-histories) apply to the macroscopic world (such as behaviors of humans, variations in personalities/consciousness, etc.)?

I understand that quantum mechanics is the science of the atomic world, however, wouldn't the macroscopic world likewise be affected by these principles, for we ourselves are made out of atoms behaving in such a manner?

Thanx

2007-04-25 15:36:44 · 3 answers · asked by Anonymous

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What's the difference between Basic Physics and Classical Physics?

I'm a Biology major and I need to take Physics. I have the option to take either classical or basic Physics. Which one is easier and more fun to learn?

2007-04-25 15:28:35 · 4 answers · asked by Alexis 2

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Why is a triangle a stronger shape for a structural support than a square?

2007-04-25 15:14:15 · 4 answers · asked by Anonymous

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a coumpound microscope and a refracting telescope are both two lense systems.?

how do their design reflect their use

2007-04-25 15:12:59 · 1 answers · asked by Anonymous

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In LAMENS terms, why is velocity always squared in E=mc^2 and E(k)=1/2mv^2?

I've already seen some badly organized math and pictures on it, which didn't help, so does anybody have a simple explanation/example of why its always squared? it seems intuitively to me that it would just be E=mc, why the squared?!

2007-04-25 15:09:45 · 1 answers · asked by Ray of Freaking Sunshine! 2

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Explain how a balanced chemical equation illustrates that mass is never lost or gained in a chemical reaction?

plz

2007-04-25 15:01:47 · 2 answers · asked by mecca laran 4

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If i was to go for a expidition to descover new land what kind of sciences woul i need.?

2007-04-25 14:59:50 · 3 answers · asked by L.O.S 1

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Which is false is regards to cosmic microwave background radiation being the remnant of Big Bang.?

A. The cosmic microwave background radiation is expected to contain spectral features due to hydrogen and helium, and it does.
B. The cosmic microwave background radiation is expected to have tiny temperature fluctuations; such fluctuations were found in the COBE data.
C. The cosmic microwave background radiation is expected to have nearly a perfect black body spectrum; observations from the COBE spacecraft verify this prediction.
D. The cosmic microwave background radiation is expected to have a temperature just a few degrees above absolute zero; its actual temperature is about 2.7 K.
E. The cosmic microwave background radiation is expected to look essentially the same in all directions, and it does.

2007-04-25 14:27:14 · 3 answers · asked by evilweather88 1

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why do gases exert pressure?

2007-04-25 14:26:53 · 5 answers · asked by Teressa M 1

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Charges and coordinate system?

A charge of -2.93 x 10^-9 C is at the origin of a coordinate system and a charge of 8.03 x 10^-9 C is on the x-axis at 2.47 m. There are two locations on the x-axis, where the electric potential is zero.

A) Find the location of the point between the charges. answer in m.

B) Find the location of the point to the left of the y-axis. answer in m.

I would appreciate any help =)

2007-04-25 14:17:09 · 2 answers · asked by That Guy 1

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A car traveling at 10 m/s starts to decelerate steadily. It comes to a completer stop in 20 sec. What is its a

A car traveling at 10 m/s starts to decelerate steadily. It comes to a completer stop in 20 sec. What is its acceleration?

2007-04-25 13:50:50 · 4 answers · asked by Ryoma Echizen 3

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Measuring Heat..?

1. The power of a coffe pot is rated at 900 watts. It can heat 1 liter of water in 2 minutes.

a) How much electrical energy does the coffee pot use in this process?

b) Assuming the coffee pot has an efficiency of 30%, how much of the electrical energy cecomes thermal energy in the water?

c) What is the increase in the temperature of the water?

2. Two beakers each contain 1 kg of water at 0°C. One kg of gold at 100°C is dropped into one beaker. One kg of aluminum at 100°C is dropped into the beaker.

a) Compare the amount of thermal energy contained in the aluminum and gold

b) After each beaker has reached thermal equilibrium, describe whether the temperatures are the same, or different. If they are different, describe which is warmer and which is colder.

c) Explain why you have your answer to part (b). Use the concept of specific heat in your explaination.

DO NOT SAY "DO YOUR OWN HOMEWORK" OF ANYTHING OF THAT NATURE.