Q 1 Two identical clocks are synchronized. One is then put in orbitdirected east
ID: 1665917 • Letter: Q
Question
Q 1Two identical clocks are synchronized. One is then put in orbitdirected eastward around the Earth while the other remains on theEarth. Which clock runs slower? When the moving clock returns tothe Earth, are the two still synchronized?
Q 2
Photons of light have zero mass. How is it possible that they havemomentum?
Q 3
If you hold water in a paper cup over a flame, you can bring thewater to a boil without burning the cup. How is this possible?
q.4
give an examle where no heat is transferred to or form asystem but the temperature of the systyem change.
why is it worng to think of heat as a form of stored energy.
Explanation / Answer
Q 1Two identical clocks are synchronized. One is then put in orbitdirected eastward around the Earth while the other remains on theEarth. Which clock runs slower? Clock in orbitruns slower
When the moving clock returns to the Earth, are the two stillsynchronized? No... clock that was in oribitshows earlier time.
Q 2
Photons of light have zero mass. How is it possible that they havemomentum? The classical definition of momentum,established by Isaac Newton, included mass, i.e. momentum = mass * velocity. Einstein rewrote the definitionin his Theory of Special Relativity to include massless photons. Solight can have momentum because Einstein's definition was writtenin terms of energy, not mass, of a particle.
Q 3
If you hold water in a paper cup over a flame, you can bring thewater to a boil without burning the cup. How is thispossible? Paper ignites when it reaches a certaincritical temperature (Fahrenheit 451, actually) The water absorbsthe heat from the flame, and keeps the paper at a relatively lowtemperature... so it never ignites.
q.4
give an examle where no heat is transferred to or form asystem but the temperature of the systyem change. If youcompress a gas, i.e. like air in a pump, the gas gets hot becauseof the work you do. If the pump is insulated, no heat will beexchanged, but the temperature will still increase because energyis added to the gas when you push on it (and do work).
why is it worng to think of heat as a form of storedenergy. By definition, heat is energy that istransferred from one object to another. Heat is not storedenergy.
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