Kinetic to heat (building a spaceship)
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From: gb on 10 Jun 2010 15:46 Usually people want to avoid friction, I want to create one. The idea is that there is a spaceship in space. You throw something, a weight from the front of the spaceship to the back of the spaceship, then the spaceship moves. But when the weight reaches the end of the spaceship, the spaceship stops in space. Now what if we convert kinetic energy into heat? Heat is this thing which can be lost as friction between the weight leaving the top of the spaceship and arriving to the end. What is launched at the top can be some chemical, which transforms from kinetic motion to where the energy of motion is lost as heat and friction. Heat can absorb energy of motion where particles lose energy by colliding with one another and they build heat. This spaceship, or flying saucer would pulse energy this way internally without letting matter escape, would use a nuclear reactor, and is a master of cruel friction. How could such a spaceship be built technologically where kinetic energy is transferred into heat, producing valid motion in physics by such a spaceship?
From: Sam Wormley on 10 Jun 2010 15:55 On 6/10/10 2:46 PM, gb wrote: > Usually people want to avoid friction, I want to create one. > > The idea is that there is a spaceship in space. You throw something, a > weight from the front of the spaceship to the back of the spaceship, > then the spaceship moves. > > But when the weight reaches the end of the spaceship, the spaceship > stops in space. > > Now what if we convert kinetic energy into heat? Heat is this thing > which can be lost as friction between the weight leaving the top of > the spaceship and arriving to the end. > > What is launched at the top can be some chemical, which transforms > from kinetic motion to where the energy of motion is lost as heat and > friction. > > Heat can absorb energy of motion where particles lose energy by > colliding with one another and they build heat. > > This spaceship, or flying saucer would pulse energy this way > internally without letting matter escape, would use a nuclear reactor, > and is a master of cruel friction. > > How could such a spaceship be built technologically where kinetic > energy is transferred into heat, producing valid motion in physics by > such a spaceship? A spaceship can be thought of as a closed system with constant momentum. Unless acted upon be an external force or unless the spaceship sheds matter or radiation, nothing much happens. dp/dt = 0
From: gb on 10 Jun 2010 18:27 On Jun 10, 12:55 pm, Sam Wormley <sworml...(a)gmail.com> wrote: > On 6/10/10 2:46 PM, gb wrote: > > > > > > > Usually people want to avoid friction, I want to create one. > > > The idea is that there is a spaceship in space. You throw something, a > > weight from the front of the spaceship to the back of the spaceship, > > then the spaceship moves. > > > But when the weight reaches the end of the spaceship, the spaceship > > stops in space. > > > Now what if we convert kinetic energy into heat? Heat is this thing > > which can be lost as friction between the weight leaving the top of > > the spaceship and arriving to the end. > > > What is launched at the top can be some chemical, which transforms > > from kinetic motion to where the energy of motion is lost as heat and > > friction. > > > Heat can absorb energy of motion where particles lose energy by > > colliding with one another and they build heat. > > > This spaceship, or flying saucer would pulse energy this way > > internally without letting matter escape, would use a nuclear reactor, > > and is a master of cruel friction. > > > How could such a spaceship be built technologically where kinetic > > energy is transferred into heat, producing valid motion in physics by > > such a spaceship? > > A spaceship can be thought of as a closed system with constant > momentum. Unless acted upon be an external force or unless the > spaceship sheds matter or radiation, nothing much happens. > dp/dt = 0 But what happens to kinetic energy when friction transfers energy of motion to heat? Heat is not the same energy as kinetic energy. It starts out as motion which dp/dt=0 refers to, but transfers into heat. The heat is something that can be lost. If the spaceship starts out with moving something under it, then transfers that something from weight to heat, the kinetic momentum is gone. The spaceship pushes itself against something which turns into heat a moment later. But thanks for the info.
From: gb on 10 Jun 2010 18:29 > Hey stooopid - the center of mass is stationary. Evil only sees himself in a small mirror when he talks, Tony.
From: Sam Wormley on 10 Jun 2010 19:17
On 6/10/10 5:27 PM, gb wrote: > On Jun 10, 12:55 pm, Sam Wormley<sworml...(a)gmail.com> wrote: >> On 6/10/10 2:46 PM, gb wrote: >> >> >> >> >> >>> Usually people want to avoid friction, I want to create one. >> >>> The idea is that there is a spaceship in space. You throw something, a >>> weight from the front of the spaceship to the back of the spaceship, >>> then the spaceship moves. >> >>> But when the weight reaches the end of the spaceship, the spaceship >>> stops in space. >> >>> Now what if we convert kinetic energy into heat? Heat is this thing >>> which can be lost as friction between the weight leaving the top of >>> the spaceship and arriving to the end. >> >>> What is launched at the top can be some chemical, which transforms >>> from kinetic motion to where the energy of motion is lost as heat and >>> friction. >> >>> Heat can absorb energy of motion where particles lose energy by >>> colliding with one another and they build heat. >> >>> This spaceship, or flying saucer would pulse energy this way >>> internally without letting matter escape, would use a nuclear reactor, >>> and is a master of cruel friction. >> >>> How could such a spaceship be built technologically where kinetic >>> energy is transferred into heat, producing valid motion in physics by >>> such a spaceship? >> >> A spaceship can be thought of as a closed system with constant >> momentum. Unless acted upon be an external force or unless the >> spaceship sheds matter or radiation, nothing much happens. >> dp/dt = 0 > > But what happens to kinetic energy when friction transfers energy > of motion to heat? Heat is not the same energy as kinetic energy. > > It starts out as motion which dp/dt=0 refers to, but transfers into > heat. The heat is something that can be lost. If heat (electromagnetic radiation) is radiated in one principle direction, then each photon had momentum, p = hν/c = h/λ and one could propel (slightly) a spacecraft, as conservation of momentum applies. If the radiation is equal in all directions, then the dp/dt for the spacecraft as a whole, remains zero. |