| Subject | Date Asked | Expert |
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| How many times the power would a sprinter have to produce to run ten times as fast? | 11/21/2009 | Steve Nelson |
Q: I've been wondering about the relation of power to speed, and I'd like it if you could clarify some ...
A: You are, of course, assuming that air resistance is the main resistance to a runner's motion. At ...
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| the "why exactly so?" for the nature of the gravitational force | 11/19/2009 | Richard J. Raridon |
Q: I want to find the answer about the nature of the gravitational force.For which exact reason do 2 ...
A: Nobody knows the mechanism. It's just a fundamental property of mass that there's an attractive ...
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| electrostatics | 11/19/2009 | Steve Nelson |
Q: what is it said that a moving automobile becomes charged ? ANSWER: Do you mean "why is it said" ...
A: Air won't charge up a vehicle much, though it is another charging (and discharging) mechanism. Air ...
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| Power | 11/19/2009 | Suresh Chandra Benjamin |
Q: A 50.0Kg student climbs 5.00m up a rope at a constant speed. If the student's power output is 200.0 ...
A: This is how you may attempt this problem : Let the student take 't' seconds to climb the rope. ...
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| Re: | 11/19/2009 | Steve Nelson |
Q: First off, I am not in school, I am trying to build a machine utilizing hydraulics to push something ...
A: The equations all work, actually, because the distance listed accounts for the radius of part B as ...
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| density | 11/18/2009 | Suresh Chandra Benjamin |
Q: How wil you calculat the density of Chlorine gas at 250kPa & 20C?
A: Here is how you may proceed : At STP one mole of any gas occupies 22.4 L space. P = 101300 Pa V = ...
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| electrostatics | 11/18/2009 | Steve Nelson |
Q: what is it said that a moving automobile becomes charged ?
A: Do you mean "why is it said" rather than "what is it said?" If so, then it's because an object like ...
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| centre of mass | 11/18/2009 | Steve Johnson |
Q: I read in a book that if the barrel of a gun is inclined at an angle of 45 degree with horizontal ...
A: That would be a strange outcome if the bullet doesn't emerge on the path it was on when it was in ...
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| Carnot Engine | 11/18/2009 | James J. Kovalcin |
Q: Kovalcin, I am a student at Laurentian University studying Geology. I am in first year and in ...
A: If 30% of the heat is dumped into the cold reservoir the efficiency of the process is 70% rather ...
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| radioactivity | 11/17/2009 | James J. Kovalcin |
Q: In the process of beta decay a proton transforms into a neutron according to p-----> n + ...
A: The energy of the incoming proton is converted into the mass of the resulting products. Mass is NOT ...
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| Force and Gravity | 11/17/2009 | David Montiel |
Q: 1.When an object is at rest, it has a weight. W=mg, When we push an object, the object is in motion ...
A: Good questions. Although I find question 2 a bit confusing. First about question 1. I understand ...
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| Uniform Circular Motion | 11/17/2009 | Steve Johnson |
Q: a 600kg racing car travels at a constant speed around a circular track with a radius of 50.0m and ...
A: In order for the car to follow the circular track, it needs to have centripetal (meaning pointed ...
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| Time Dilation | 11/17/2009 | Expert |
Q: What is the equation for time dilation and can you explain what each variable stands for? For ...
A: Please forgive my delay in responding -- it's the only way I can think of, to ensure I am not ...
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| floatation | 11/16/2009 | Steve Johnson |
Q: can you verify the third case in principal of floatation in which body floats above the surface of ...
A: Yes, that is true. Here's a way to think about it that might help it make sense. Imagine that you're ...
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| Heat produced as "we" go closer to a planet's core | 11/16/2009 | Expert |
Q: i watched a documentary show and it states that if we are on another planet, to avoid the cold, we ...
A: As you go deeper into a planet -- whether that planet is solid or gaseous -- the weight of the ...
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| Circular Motion and Gravitational Forces | 11/16/2009 | James J. Kovalcin |
Q: Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people ...
A: Question 1 is a relative velocity question. Just add the velocity of you to the velocity of the bus! ...
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| computational fluid dynamics | 11/15/2009 | Steve Johnson |
Q: what are mathemtical concepts for this subject .learning matlab is sufficient or compulsory c++,c ...
A: This topic is beyond my expertise. However I'm pretty good at searching the web. Check these sites. ...
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| Physics | 11/15/2009 | James J. Kovalcin |
Q: Sorry if this question has been asked before but i can't find it on the sheet. Someone jumps a hole ...
A: All 2 dimensional kinematics problems can be solved in the same way. There are 6 kinematics ...
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| Circular Motion and Gravitational Forces | 11/14/2009 | James J. Kovalcin |
Q: Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people ...
A: a) To determine the velocity of someone at the equator use the definition of velocity: v=dD/dT ...
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| outer space | 11/14/2009 | Expert |
Q: i have read the link that you have given me. but i dont understand why vacuum is cold in space. wont ...
A: > wont the sun be able to heat us up like how it heats the planets up? The main reason our Sun ...
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| physics | 11/14/2009 | James J. Kovalcin |
Q: please give me ideas for making working model on any topic of physics like light, electricity, ...
A: One of the most fun projects is to make a "Rube Goldberg" machine. [Do a Google search on this ...
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| space | 11/14/2009 | Expert |
Q: is space reali vacuum? i ask this question because i watched a documentary show and it says that the ...
A: > is space reali vacuum? Not sure how you would define "really" a vacuum. Even the area between ...
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| dielecric | 11/14/2009 | David Montiel |
Q: i 'm really sorry for not paying attention carefully. any way i derivative from it but even now i ...
A: God job! By the way, you DID find "F" as a function "x" ...
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| Energy and Expanding Universe | 11/13/2009 | Richard J. Raridon |
Q: If energy cannot be created or destroyed in the universe, then what does it mean that the universe ...
A: The law used to state that energy cannot be created or destroyed but can be changed in form. That's ...
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| Energy and Expanding Universe | 11/13/2009 | Richard J. Raridon |
Q: If energy cannot be created or destroyed in the universe, then what does it mean that the universe ...
A: It's not true that energy cannot be created or destroyed. That changed when fission was discovered ...
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| specific heat capacity | 11/13/2009 | James J. Kovalcin |
Q: if you wish to warm 100 kg of water by 18 degrees celsius for your bath, how much heat is required? ...
A: The heat needed to change the temperature of a substance is given by: dQ=m*c*dt where dQ is the ...
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| Sky at day and night | 11/13/2009 | Expert |
Q: why in the day, the sky is blue even without clouds? i thought it should be dark like space. we are ...
A: When the light from our Sun hits directly upon the atmosphere of our Earth, some of it is scattered ...
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| could you please help me! | 11/13/2009 | Steve Johnson |
Q: 1. When an athlete is preparing to throw a shot put ball, does the ball exert a force on the ...
A: 1. Yes it does. While preparing to put, and while putting too. Consider a book sitting on a scale. ...
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| GR based on the person IN the chest | 11/12/2009 | Expert |
Q: Einstein states that if a person is in an enclosed spacious chest suspended in a uniform ...
A: > we first look at the chest and the two rockets from the perspective > of someone in an inertial ...
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| Changing state of matter | 11/12/2009 | Expert |
Q: i heared that we are able to compress water to become solid. but can we sort of do the opposite ...
A: > can we sort of do the opposite which is like pull the water to become gas? If liquid water is ...
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| observations | 11/12/2009 | Steve Nelson |
Q: I know under the rules of the quantum, that when we observe a particle, we change it, but how do we ...
A: I'll point you to this: http://www.aip.org/history/heisenberg/p08a.htm Based on some pretty ...
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| quantum | 11/12/2009 | Steve Johnson |
Q: I know under the rules of the quantum, when we observe a particle we change it. But, how do we know ...
A: Your brief statement of "the rules of the quantum" is a oversimplification. As I said in my profile, ...
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| Quantum interaction | 11/12/2009 | Expert |
Q: according to the rules of the quantum, when we observe (interact) with a particle, we change it, but ...
A: What quantum physics assumes is that a system (let's say an electron) does not HAVE a specific state ...
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| observation | 11/12/2009 | James J. Kovalcin |
Q: I've been reading about the quantum and I know if you observe (interact) with what you are ...
A: A full discussion would be rather lengthy but the fact is that experiments have been run where the ...
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| capacitor | 11/11/2009 | David Montiel |
Q: you ve asked me to answer what is the U(x). C1=έ0A/X for empty part ,and C2=έ0A/k(L-X ) ...
A: There are three lenghts: One of them is d = the distance between the plates (thickness of the ...
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| electricity | 11/11/2009 | James J. Kovalcin |
Q: explain why a battery of ten dry lechlanche cells each of emf 1.5volts cannot be used in place of a ...
A: Electric power requires BOTH current and voltage. The current is the carrier of energy while the ...
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| building catapults | 11/11/2009 | Steve Nelson |
Q: I am not sure if you will be able to help me with my problem, if you cant it would be appreciated if ...
A: I would suggest a combined approach. Use both the lead weight and the rubber band for energy, so ...
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| Dispersion of white light | 11/11/2009 | Expert |
Q: when light travels through a prism, red light will be at the top when it exits and violet would be ...
A: > am i right to say that red light is travelling at a faster speed then violet light? > am i right ...
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| capacitor | 11/11/2009 | David Montiel |
Q: you ve asked me to answer what is the U(x). C1=έ0A/X for empty part ,and C2=έ0A/k(L-X ) ...
A: You're on the right track! And yes, you can suppose that these 2 parts are like 2 parallel ...
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| Why are planets round? | 11/11/2009 | Expert |
Q: why is the earth round? even othe planets and moon is round, even the sun. is this a coincedence? ...
A: You have wisely noted a pattern -- large objects tend to be round -- but have arrived at an ...
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