Recent content by biire2u

  1. B

    What is the linear speed of the bicycle chain?

    The linear speed of the chain never changes unless the cyclist varies his RPM. If he pedals at 30 RPM his linear speed of the chain will be 30 times the circumference of the front ring. If he pedals at 130 RPM, it will be 130 times the circumference of the front sprocket The gearing and wheel...
  2. B

    Why does the dynamo in my bicycle generate DC instead of AC?

    It has to do with the commutators that collect the current. On the axle there is a copper piece that has a split between the two copper pieces and brushes that rub against them. In a DC the split causes the DC current to go one way by taking the top half of the sine wave generation and reversing...
  3. B

    How do you explain the process of burning gasoline in car in terms of?

    The law of conservation of matter just says what ever mass you begin with you end up with. So if you have reactants of 1 kg of gasoline and 7kg of oxygen to burn with you will get 8 kg of water vapor and carbon dioxide as products The 2nd law of Thermodynamics just says it is impossible to...
  4. B

    Is depressing the gas pedal of a car the only that the driver can make the

    The driver can also park a car on the top of a big hill. When he releases the brake, gravity will accelerate the car to whatever velocity air resistance and road grade will allow it to be. You can also crash into a wall or tree and the car will experience negative acceleration. You can do all...
  5. B

    Physics question. pls answer scientifically?

    Well..actually it isn't to dangerous, but it's a case of better be safe than sorry. The high voltage lines can exceed 750,000 volts and that amount of voltage can actually jump across air if a ground is near by (think of stun guns where even 50,000 V can jump air across the contacts) If you...
  6. B

    This book argues that irrationality is no hinderance to something being true?

    Mistress Bekki put it most eloquently and forthright. I just wish to add my own simplified versions. Just because you have a theory of something doesn't mean the theory is correct. It might be supported for 99.9 % of the cases you test, but for that 0.1% left over, gives rise to the theory...
  7. B

    I've got a restaurant / has a lot of widows / getting a large amount of heat...

    The best option, and it looks good, is to put up awnings outside the building over the windows. If you use shades inside the restaurant the sun energy (infrared) still comes thru the windows ans strikes the shades and the infrared converts to heat energy and goes up to your ceiling between the...
See more
Back
Top