Which of the following is not true of thermal equilibrium? O If two objects are both in thermal equilibrium with a third object, they have the same temperature. OTwo objects in thermal equilibrium are at the same temperature. O Temperature continues to change, but in an oscillatory fashion. OTwo objects in thermal equilibrium must be in thermal contact with one another.
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- Review | Seals may cool themselves by using thermal windows, patches on their bodies with much higher than average surface temperature. Suppose a seal has a 0.030 m? thermal window at a temperature of 30° C.(Figure 1) Part A If the seal's surroundings are a frosty -18 °C, what is the net rate of energy loss by radiation? Assume an emissivity equal to that of a human. Express your answer in watts. ? Qnet W At Submit Request Answer Figure < 1 of 1 < Return to Assignment Provide Feedback 33.0 C 30 25 20 15 62 min 1.5°CA 689.00g block of gold ( cgold=129 J kg°C ) initially at 15.00°C is placed in thermal contact with an unknown mass of aluminum ( calum=900 J kg°C ) initially at 90.00°C . If they equilibrate at a final temperature of 68.00°C , what is the mass of the aluminum? g What assumption do we make when solving calorimetry problems like this? We can only have two substances in thermal contact. The substances are in a closed, isolated container that does not allow any energy to enter or leave the system. The two substances must have different specific heats. Some of the energy transferred from one substance is lost to its surroundings and does not go to the other substance.Two bodies P and Q are in thermal equilibrium. This statement means that 18. A There is no transfer of energy between P and Q. B The rate of transfer of heat between P and Q is constant. C P and Q have the same amount of internal energy. D Pand Q are in physical contact with cach other.
- D Copper, tin, shmian, plas because metals are good conductors of beat and transfer heat faster. Kinetic energy in the form of heat increases the motion of the molecules. Regions B and D of heating curve represent segments of the curve where heat is being added, but the temperature is not changing. E C MIN MIN NOI C CO Which of the following is the BEST explanation for regions B and D of the curve and why? The substance beazes or condesses because it is undergoing an exothermic phase change. The substance melts or evaporates because it is undergoing an endothermic phase change. The substance sublimes or deposits because it is undergoing an exothermic phase change. The substance freezes or evaporates because it is undergoing an endothermic phase change. Question 12 The image depicts the heating curve for water. 2615 words [X O Accessibility: Unavailable 2 11 W I We're startin7B. A 98.2 g copper rod is cooled from 80°C to 25°C by tossing it into a very large swimming pool at 25°C. The temperature of the pool is not appreciably changed in the process. Compute ASys, ASur and ASniv- (Treat the copper rod as the system.) Some possibly useful data for Cu: C,m-24.44 J K 'mol 'univ p.mQuestion 5 Specific Heat of Solid Substances Substance D Aluminum B silver; because it is a transition metal with the lowest specific heat value C Iron Copper Tin Given the specific heat information presented, which substance would make the BEST material to create a pan for cooking and why? D Specific Heat (J/kg°C) 899 443 385 213 Tin - because it has a low specific heat, which means it conducts heat the best. Aluminum - because it has a high specific heat, which means it conducts heat the best. Copper - because it has a mid-level specific heat, which means it is a good insulator. Iron - because it has a mid-level specific heat, which means it is a good conductor.
- How much energy is required to change a 43.0-g ice cube from ice at -6.0°C to steam at 107°C? 43657 Make certain you think through carefully the various stages that the ice must go through in order to reach the final state of steam at 107°C. JWhich would cause a more serious burn: 30 g of steam or 30 g of liquid water, both at 100 °C; and why is this so? O Water, because its specific heat is greater than that of steam. O Steam, because of its specific heat capacity. O Water, because it is denser than steam. O Steam, because of its latent heat of vaporization. O Either one would cause a burn of the same severity since they are both at the same temperature.