Silver Steam Ice chamber water Copper
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Two metal rods, one silver and the other copper, are both attached to a steam chamber as shown in the figure, with a temperature of 100°C, at one end, and an ice water bath, with a temperature of 0°C, at the other. The rods are 19.0 cm long and have a square cross-section, 2.0 cm on a side. When steady state has been reached, how much heat flows through the two rods in 1.0 min? The thermal conductivity of silver is 417 W/(m ∙ K), and that of copper is 395 W/(m ∙ K). No heat is exchanged between the rods and the surroundings, except at their ends.
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- Two metal rods, one silver and the other copper, are both attached to a steam chamber as shown in the figure, with a temperature of 100°C, at one end, and an ice water bath, with a temperature of 0°C, at the other. The rods are 5.0 cm long and have a square cross-section, 2.0 cm on a side. When steady state has been reached, how much heat flows through the two rods in 1.0 min? The thermal conductivity of silver is 417 W/(m · K), and that of copper is 395 W/(mK). No heat is exchanged between the rods and the surroundings, except at their ends. Steam chamber A) 20 kJ B) 39 kJ C) 47 kJ D) 49 kJ E) 11 kJ Silver Copper Ice waterConsider a 3-m-high, 6-m-wide, and 0.3-m-thick brick wall whose thermal conductivity is k = 0.8 W/m K. On a certain day, the temperatures of the inner and the outer surfaces of the wall are measured to be 14°C and 2°C, respectively. Determine the rate of heat loss through the wall on that day.A large cylindrical coffee pot in a coffee shop filled with 10.0 kg of hot coffee at temperature T = 95.0 ° C rests on a wooden table. The steel pot has radius r = 8.00 cm and height h = 50.0 cm and an emissivity e = 0.600. See figure. Assume that all heat loss is radiative through the side and top of the pot, given that wood is a relatively poor thermal conductor. The coffee shop ambient temperature T = 20.0 ° C. a) Find the rate at which the coffee losses heat. b) Assuming constant heat loss rate, what is the coffee temperature after 10.0 minutes have elapsed? Cw = 4.19 x 103 J/kg °C, ρw = 1.00 x 103 kg/m3, σ = 5.67 x 10 -8 W/m2 K4
- Two bars are placed between plates whose tempera- tures are Thot and Testa (see the drawing). The thermal conductivity of bar 1 is six times that of bar 2 (k, = 6kg). but bar I has only one-third the cross-sectional area (A,A). Ignore any heat loss through the sides of the bars. What can you conclude about the amounts of heat Q, and Q₂, respectively, that bar 1 and bar 2 conduct in a given amount of time? (a) Q₁ = 0; (b) Q₁ Q₂ (c) Q₁ = 20; (d) Q₁ = 40₂ (e) Q₁ = Q: That Bar 1 Bar 2 5- If an object is not in thermal equilibrium with surroundings (they have different temperatures). a) the net heat and net power emitted by the object is zero. b) the net heat emitted by the object is zero but the net power emitted is not zero. c) the net power emitted by the object is zero but the net heat emitted is not zero. d) the net heat and net power emitted by the object is not zero.Two pots are identical except that the flat bottom of one is aluminum, whereas that of the other is copper. Water in these pots is boiling away at 100.0 °C at the same rate. The temperature of the heating element on which the aluminum bottom is sitting is 150 °C. Assume that heat enters the water only through the bottoms of the pots and find the temperature of the heating element on which the copper bottom rests. Tcu i = <Objects A and B in the figure are made from copper, but the mass of object B is three times that of object A. Object C is made from glass and has the same mass as object B. The same amount of heat Q is supplied to each one: Q = 13.4 J. Determine the rise in temperature of (a) block A, (b) block B, and (c) block C. Assume specific heat capacities c = 387 J/(kg-C°) for copper and c₂ = 840 J/(kg-Co) for glass. Copper B Glass C A mA =1.60g mB 4.80g mc4.80g