If motion is heat?

Question

How fast & for how long would you need to spin a pint of water, in order to get it to boil ?

Answer 1

the temperature of a body in kelvin can be found from the equation
K*T = 1/2*m*

basically. a constant, multiplied by the temperature, is equal to the average kinetic energy of the molecules in the body. therefore. spinning the water would probably cause very little change in the temperature in kelvin unless you could spin it sufficiently fast to cause a statistically significant increase in then you are unlikely to see a greatly noticeable increase in temperature. then there is the issue that the faster you spin the water the greater the pressure on the surface. the greater the pressure the higher the boiling point. therefore i feel that it is unlikely the you could boil water simply by spinning it . at least without specialised apparatus.

Answer 2

Heat really is compleatly different from what your talking about. Heat is the direct amount of energy something has, so all your saying is how much energy something has, same as sound, motion, etc. Temperature is the average kinetic energy which is measuered in degrees. Either way though, i dont see this being possible, water is viturally incompressible so your not going to get heat that way (energys released when things are compressed) and even if you could spin it fast enough, the centrifigual forces would be too great to allow the molecules to spread enough to become a gas anyways.

Answer 3

Motion results in heat only when friction is caused.
Motion is not heat itself.

If a pint of water is spun, it will depend on the texture of the container as friction is due to the rubbing of the water on the interior surface of the container.

Answer 4

You are talking about the mechanical equivalent of heat.

Thermal heat is E=mcT
Where E is energy
m is mass of the substance, in this case water
c is the specific heat capacity of water or 4.2 kilojoules per gramme per degree Celsius.

mechanical energy is 1/2 mv^2

where v is the velocity that you are moving the water

:. cT = v^2

ie you have to move the water very fast or for a long time before you get an appreciable change in temperature.

Thomas Joule did these experiments in the early nineteenth century.

Answer 5

You are muddling up types of motion. Heat is a form of energy. Essentially, as matter heats up it is gaining energy in the form of molecular motion. In gasses the molecules move around faster and in liquids and solids, the constituent molecules vibrate more. Spinning a pint of water is merely moving the whole mass around. the water molecules are not gaining energy.

Answer 6

pretty damn fast!

so fast that the pressure generated would probably raise the boiling point considerably.

Molecular kinetic energy and heat are very closely linked, just look at the three basic states of matter.

Mechanical kinetic energy wouldn't necessarily generate enough friction in the molecules to give any significant rise in temperature- good theoretical question though

Answer 7

spining water doesnt cause it to heat up that I am aware of. Maybe at super sonic speeds. But just normal in a bucket I dont know.

Answer 8

Heat is disorganized motion: the type of motion you are alluding to would be an organized type of motion.

Answer 9

you are confusing motion with friction.

Answer 10

half as fast and 2minutes