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Two objects are maintained at constant temperatures, one hot and one cold. Two identical bars can...
Two identical objects are in thermal contact. One is at a high temperature (T-hot) and the...
Two identical objects are in thermal contact. One is at a high temperature (T-hot) and the other is at a cool temperature (T-cool). Assume that this system is isolated, i.e. there is no interaction with the surroundings. Using the thermodynamic definition of entropy, explain why heat always flows from T-hot to T-cool, and never the other way around.
10 pts Question 17 Two bars, A and Beach of length 2.3m and cross-sectional area 1.4...
10 pts Question 17 Two bars, A and Beach of length 2.3m and cross-sectional area 1.4 m., are placed end to end as shown in the figure. The thermal conductivities of the bars are 450 W/mK) and 905 l/s.m.K), respectively. The left end of bar Ais maintained at 373 Kwhile the right end of Bis maintained at 273 K. What is the temperature at the interface between A and B? Please round your answer to the nearest whole number B...
Data are provided for two reversible refrigeration cycles. One cycle operates between hot and cold reservoirs...
Data are provided for two reversible refrigeration cycles. One cycle operates between hot and cold reservoirs at 27°C and 15°C, respectively. The other cycle operates between the same hot reservoir at 27°C and a cold reservoir at -20°C Weycle, If each refrigerator removes the same amount of energy by heat transfer from its cold reservoir, determineeyclc the ratio of the net work input values of the two cycles. Weycle,2 Weycle,1
Imagine you are comparing the ability of electric hot plates of different sizes and temperatures to...
Imagine you are comparing the ability of electric hot plates of different sizes and temperatures to fully cook two identical large pots of spaghetti. Note that all the pots are as large as the largest hot plate. The color of each hot plate is used to illustrate its i emperature. 21 If you use two hot plates of the same size, can you assume that the hot plato tmat can cook a large pot of spaghetti first is at the...
Chenical reaction, Figure 1: Two end of the rods are maintained at different temperatures A chemically...
Chenical reaction, Figure 1: Two end of the rods are maintained at different temperatures A chemically reacting mixture is stored in a thin-walled spherical container of radius 1 200 mm, and the exothermic reaction generates heat at a uniform, but temperature-dependent volumetric rate of q exp( A/T ), where如= 500 W/m3. A = 75 K. and To IS the mixture teinperature in kelvins. The vessel is enclosed by an insulating material of outer radius r2, thermal conductivity k, and emissivity...
Background info: two containers, one at 305K and the other at 295K, are placed in contact...
Background info: two containers, one at 305K and the other at 295K,
are placed in contact with each other.
Please use this info to answer these two questions.
Thanks!
Part B. Generalize this problem: the two containers are at temperatures Ti and T2 (Kelvin) and heat Q flows from container1 to container 2 1. Derive a formula for the change in entropy AS (for the entire system) as a function of Q, Ti and T2 2. Show that as 0...
1. A 10 kg, 2 m long board is placed on two supports. One is at...
1. A 10 kg, 2 m long board is placed on two supports. One is at the left end the other is 1.5 m to the right of the first. You have two boxes. One with a mass of 2.0 kg, and one with a mass of 4.0 kg. A. If the 2 kg box is 0.5 m from the left end and the 4 kg box is at the right end, what is the location of the center of...
#2 l methods of heat transfer. The figure to surface the right shows a cut-away drawing...
#2
l methods of heat transfer. The figure to surface the right shows a cut-away drawing of a thermos bottle (also known as a Dewar flask), which is a device designed specifically to slow down all forms of heat transfer. Explain the functions of the various parts, such as the vacuum, the silvering of the 2 glass walls, the rubber support& spring centering device, the air layer, and the screw on stopper up top. cei Hot or cold iquid Vac...
Two ropes have one end each attached to a wall and ceiling joint with the other...
Two ropes have one end each attached to a wall and ceiling joint with the other two ends hooked to a small ring. If there is a third rope shown below Rope 1 Rope 2 0 = 30.0 degrees Rope 3 1.0 X 102N Part A - What is the tension in the first rope? VO AED ? Newtons Submit Request Answer Part B - What is the tension on the second rope? ΟΙ ΑΣΦ ? Newton Submit Request Answer...
all six plz (better with explaination) 25. A real (non-Carnot) heat engine, opcrating between heat reservoirs at temperatures of 650 K (hot) and 270 K (cold) performs 4.3 kJ of net work and rej...
all six plz (better with explaination)
25. A real (non-Carnot) heat engine, opcrating between heat reservoirs at temperatures of 650 K (hot) and 270 K (cold) performs 4.3 kJ of net work and rejects 8.0 kJ of heat in a single cycle. The thermal efliciency of this heat engine is closest to A. 0.35. B. 0.31 C. 0.28 D. 0.38 E. 0.42 26. A 2.0-kg block of aluminum at 50° is dropped into 5.0 kg of water at 20°C and...
10 pts Question 17 Two bars, A and Beach of length 2.3m and cross-sectional area 1.4 m., are placed end to end as shown in the figure. The thermal conductivities of the bars are 450 W/mK) and 905 l/s.m.K), respectively. The left end of bar Ais maintained at 373 Kwhile the right end of Bis maintained at 273 K. What is the temperature at the interface between A and B? Please round your answer to the nearest whole number B...
Data are provided for two reversible refrigeration cycles. One cycle operates between hot and cold reservoirs at 27°C and 15°C, respectively. The other cycle operates between the same hot reservoir at 27°C and a cold reservoir at -20°C Weycle, If each refrigerator removes the same amount of energy by heat transfer from its cold reservoir, determineeyclc the ratio of the net work input values of the two cycles. Weycle,2 Weycle,1
Imagine you are comparing the ability of electric hot plates of different sizes and temperatures to fully cook two identical large pots of spaghetti. Note that all the pots are as large as the largest hot plate. The color of each hot plate is used to illustrate its i emperature. 21 If you use two hot plates of the same size, can you assume that the hot plato tmat can cook a large pot of spaghetti first is at the...
Chenical reaction, Figure 1: Two end of the rods are maintained at different temperatures A chemically reacting mixture is stored in a thin-walled spherical container of radius 1 200 mm, and the exothermic reaction generates heat at a uniform, but temperature-dependent volumetric rate of q exp( A/T ), where如= 500 W/m3. A = 75 K. and To IS the mixture teinperature in kelvins. The vessel is enclosed by an insulating material of outer radius r2, thermal conductivity k, and emissivity...
Background info: two containers, one at 305K and the other at 295K,
are placed in contact with each other.
Please use this info to answer these two questions.
Thanks!
Part B. Generalize this problem: the two containers are at temperatures Ti and T2 (Kelvin) and heat Q flows from container1 to container 2 1. Derive a formula for the change in entropy AS (for the entire system) as a function of Q, Ti and T2 2. Show that as 0...
#2
l methods of heat transfer. The figure to surface the right shows a cut-away drawing of a thermos bottle (also known as a Dewar flask), which is a device designed specifically to slow down all forms of heat transfer. Explain the functions of the various parts, such as the vacuum, the silvering of the 2 glass walls, the rubber support& spring centering device, the air layer, and the screw on stopper up top. cei Hot or cold iquid Vac...
Two ropes have one end each attached to a wall and ceiling joint with the other two ends hooked to a small ring. If there is a third rope shown below Rope 1 Rope 2 0 = 30.0 degrees Rope 3 1.0 X 102N Part A - What is the tension in the first rope? VO AED ? Newtons Submit Request Answer Part B - What is the tension on the second rope? ΟΙ ΑΣΦ ? Newton Submit Request Answer...
all six plz (better with explaination)
25. A real (non-Carnot) heat engine, opcrating between heat reservoirs at temperatures of 650 K (hot) and 270 K (cold) performs 4.3 kJ of net work and rejects 8.0 kJ of heat in a single cycle. The thermal efliciency of this heat engine is closest to A. 0.35. B. 0.31 C. 0.28 D. 0.38 E. 0.42 26. A 2.0-kg block of aluminum at 50° is dropped into 5.0 kg of water at 20°C and...
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