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Posts posted by Abhay.K










  2. actually putting less energy and obtaining more energy is quite impossible ...because

    (1)- most of the energy put into a machine gets lost or wasted due to surface and air friction ... (even in, space though there is no air friction, surface friction between 2 objects is always present)

    (2)-suppose such a method can be used, if you just theoretically cancel out the energy put(which is less) and the energy obtained(which is more), then it is kind of obtaining free energy..which is not possible.


    you can you use other forms of energy like solar energy which is obtained free(literally) to run such machines.

  3. 20 grams of radium would be a perfect heat source. Other ideas are hydrogen, methanol, lithium, magnesium ribbon, or plain wax. Use a roughly dome shaped balloon. Use a really thin, grocery bag-like plastic. http://www.wikihow.com/Make-a-Mini-Flyable-Hot-Air-Balloon-with-Candles

    similarly I tried the way you told...............that is using thin plastic bags..and kept a candle below its opening

    But actually the hot air from the candle literally deformed(melted) the thin plastic bag at the point right above the candle fire (though it is at a distance).( actually i used a big candle, didn't try using birthday candles or any thread)

  4. it is due to the chemical property of the substance that it sublimates......eg- dry ice ...there is nothing called liguid CO2 it changes its state from solid to directly gas(that is it sublimates)....this is similar with camphor.


    The temperature in my kitchen is about 22 centigrade, in my refrigerator about 4 C. Sometimes I open the refrigerator and take somethng out, then close it and after some seconds I open it again. And then I must apply much more force to open the refrigerator door. It means that opening the door for the first time lowered considerably the pressure in the fridge compartment.

    Why is it so?

    As I understand, when I open the door for the first time the hotter air from the room enters the fridge compartment and the pressure should rise and not fall.

    Please explain somebody



    (1)- may be the hot air(which has more volume)may enter the fridge .After you close it, the hot air in the fridge may cool down thus creating a partial vacuum. Atmospheric pressure exerts a pressure on the door . thus you may feel difficult to pull the door .

    (2)- also may be when you close the door fast, most of the air in the fridge may expel out(like the functioning of a suction cup used in car windshield), thus creating a mild vacuum in the fridge.

  6. The energy (consider it our muscular energy) that is required to put the magnets close together could be same(only with zero friction) or more than the energy that is captured (when the magnets repel.)

    also mostly the muscular energy spent in putting the magnets close together will be more than the energy gained (when the magnets repel).because as we bring the magnets close to each other they also exert a negative force or a opposite force(magnetic force) to our muscular force.............So.we need to over come that negative force to bring the magnets together..............which takes more energy.


    Dear Sir/Friends,



    I was just observing the functioning of a wind mill to generate electricity(Conversion of mechanical energy to electrical energy). If so, my question is , Can't we generate electricity from fan while it is running so that the mechanical energy while the fan is rotating can be converted into electrical energy ?



    yes this can be done but it increases friction and thereby slightly reducing the speed of the fan.






  7. Will it work? No.


    Here's why:


    1. Perpetual machines cannot exist. They are not allowed under the rules by which the universe works.


    2. That being said, here is why your particular design fails.


    Buoyancy is due to the pressure difference across the object. The pressure of a fluid (gas or liquid) varies with depth. It is the difference in pressure between the top and bottom of the object that pushes it up leading to buoyancy. No. Here's why:


    There will also be a pressure difference across the openings between the tanks. When the objects pass from one tank to the other they will experience a force due to this difference.

    When the objects through the upper opening (going from high to low density gas) this force helps to push them through, however when they pass through the lower opening (going from low to high density gas) the force pushes against them.


    Now here's the point:

    The difference in pressure for the dense gas varies with depth more than the difference for the lighter gas. This means that the pressure difference between the two tanks at the upper opening is less than that at the lower opening, and you will have more force to push against going from lighter to heavier gas than you get help going from heavier to lighter gas. This difference will cancel out the difference in buoyancy of the objects while rising or sinking in either tank, ending with no net force left over to turn the device.


    Janus, thank you for this information





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