Physics, 05.10.2019 06:00, danaya111

Determine the change in thermal energy of 100 g of copper (m = 63,5, debye 348k) if it is cooled from

(a) 300 k to 4 k,

(b) 78 k to 4 k

(c) 20 k to 4 k.

if the latent heat of liquid he is 2700 j. l -1 , calculate how much he is needed to bring the cooling about in each case.

Answers: 2

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Physics, 29.06.2019 20:30, blair23

Imagine that you place a piece of copper with an initial temperature of 20°c in contact with some liquid water with an initial temperature of 100°c. assume that the physical system consisting of the copper and the water is thermally isolated from everything else; i.e., they can only exchange energy with each other. a) sketch two three-phase diagrams, one for each substance, and mark the initial state for each one. explain in a sentence or two how you can tell if either substance will undergo a phase change during the process of coming to thermal equilibrium. you do not need to do any calculations. b) construct a complete energy-system diagram for the process that ends when the two substances are in thermal equilibrium. don't forget that a complete diagram always includes an algebraic expression of energy conservation for parts (c) of this fnt use the same initial conditions for the copper, but assume that the h2o is initially in the gas phase at 100°c. sketch two three-phase diagrams, one for each substance, and mark the initial state for each one. how can you determine if the h2o will undergo a temperature change? what calculations and comparisons would you need to make? (don't actually do the calculations; just explain what you would need to do.)

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Physics, 17.07.2019 17:10, bruhh14

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Physics, 27.09.2019 22:20, jaibean1202

Acombination of 0.250 kg of water at 20.0°c, 0.400 kg of aluminum at 26.0°c, and 0.100 kg of copper at 100°c is mixed in an insulated container and allowed to come to thermal equilibrium. ignore any energy transfer to or from the container and determine; a. the final temperature of the mixture.b. the change in the entropy of the universe in this experiment.

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Which of the following is true about high-energy mechanical devices? a.they usually need to be kept warm in order to preserve mechanical energy b.they usually need to be cooled to dissipate thermal energy build- up and prevent damage. c.they usually convent radiant energy into electrical energy d.during an energy conversion none of the energy is transferred as thermal energy because the devices are free of friction

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Determine the change in thermal energy of 100 g of copper (m = 63,5, debye 348k) if it is cooled fro...

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Determine the change in thermal energy of 100 g of copper (m = 63,5, debye 348k) if it is cooled from (a) 300 k to 4 k, (b) 78 k to 4 k (c) 20 k to 4 k. if the latent heat of liquid he is 2700 j. l -1 , calculate how much he is needed to bring the cooling about in each case.

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Determine the change in thermal energy of 100 g of copper (m = 63,5, debye 348k) if it is cooled from

(a) 300 k to 4 k,

(b) 78 k to 4 k

(c) 20 k to 4 k.

if the latent heat of liquid he is 2700 j. l -1 , calculate how much he is needed to bring the cooling about in each case.