this question relates to physics
210177
Earth revolves around the sun because the giant nebula out of which the solar system formed was spinning and the angular momentum is conserved, and earth spins because of the initial config. Why it revolves in an ellipse, see this\nexplanation at http://www.mathsnet.net/cabri/feynman.html
118895
Please, watch these examples below to solve your problem it take a lot of explanation so take you to some good websites for the purpose.\n\nhttp://360.yahoo.com/jcbroogley
513562
Try looking at the equation for the Laws of Strings... If they are directly proportional, meaning, they are on the opposite sides of the equation, then an decrease of 1% is also an decrease of 1% to the other. \n\nTry looking it up in Resonance too... But I am more confident of my first answer... Studey the equation!
625630
by any chance is this a question from your maths homework? lol :D\n\nI cant work it out myself because to put it simple, im crap at maths.
13001
It is 'B'. But I don't understand why you put up this question under 'Physics'!
291422
Go to your local physics professor. If you are correct, (s)he will no doubt help you to get it published. If you are incorrect, (s)he should be willing to show you where your math is off.
146529
Kindly refer to :\nhttp://www.sciencenews.org/articles/20000429/note12ref.asp\nYou will find your answers.
98400
http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html
436630
Hi. I think it deals more with the interaction of radiation with particles (or a particle) than with speed. At any non-relativistic speed (less than .1 'c' say) the wavelength would not be infinite or unbounded. Just my opinion.
106438
This has to do with the laws of gravity... a larger object will attract a smaller one to it.  \n\nits not a constant for all objects however, it depends of the mass of the object being attracted.
577613
Well, take a look at this:\n\nhttp://www.answersingenesis.org/docs/2.asp
594294
The question is too open. What experiment are you talking about? If you google science supplies you might find out, although since it's homework most people won't just give you an answer.
222354
None. It takes no power to maintain that speed (on level ground, no friction). The object has kinetic energy (0.5 * m * v^2). Power was required to put it in motion and power can be recovered by decelerating it. If you do the math, the energy is 3551.86 ft-lb, equivalent to 1 horsepower for 6.458 seconds. Answer 1 neglected the fact that weight must be converted to mass by dividing by g, and energy is proportional to v^2.
20910
The last poster needs to have his dynamic physics retaught, or stop trying to sound like an engineer.\n\nThe first mistake, is identifying newtons = force x distance.  This is actually a measure of work or energy and measured in joules.  The second mistake identifying force as being measured in joules.  Force is measured in Newtons.  Since it was Isaac Newton in the second law of motion that defined Force.\n\nYour question cannot really be answered without more information.  What is the direction of motion, horizontally or vertically?  \n\nVerically?  Then 150 lbs of force.  Pounds were once used to measure force.  If you want to use metric, convert the 150 lbs to kilograms, multiply by 9.8 and then you must exert at least this much force in Newtons to overcome the force of gravity.  150 lbs is 68.04 kg.\n\nHorizontally, what type of surface?  Determine the coefficient of friction, and multiply it by the mass in kilograms.  Then this is the amount of force you need to exert to overcome the force of friction.  There are two types of friction, static and dynamic.  In other words it takes more force to move an object at rest, but once the object is in motion it takes less force to keep it move (opposing the dynamic force of friction).\n\nWatts by the way is a measurement of power, which is energy derived by time, Power = dE/dt.  Joules per second.
489517
I know the answer is in my basic physics book.  I would have to look it up.  You should too.
318034
Try asking in the Engineering catergory. You might get more answers there. I personally don't know anything about it. Sorry.
338242
Gravity, centrifugal forces and centripetal forces