When two objects are in thermal contact heat energy is transferred from the hot to the...
- When two objects are in thermal contact heat energy is
transferred from the hot to the cold object until the temperature
of both becomes equal (i.e., the objects are in thermal
equilibrium). Suppose you pour 20-gram milk at 200C into
a cup of 80-gram tea at 920C. Assume the specific heat
of tea is 4.2 J/gram.0K and that of milk is 3.9
J/gram.0K
- Assuming no heat is lost into the surrounding air what is the temperature of the tea and milk when they come into thermal equilibrium shortly after the mixing?
- How much heat is transferred between tea and milk?
Homework Answers
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When two objects are in thermal contact heat energy is
transferred from the hot to the...
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.
When two objects with different temperatures are placed in contact, the amount of heat transferred into...
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Choose the correct statement below regarding heat and temperature. When a hot object is placed in...
Choose the correct statement below regarding heat and temperature. When a hot object is placed in contact with a cold object, it loses heat until it reaches the temperature of that cold object. Heat is energy that is transferred between objects. The temperature of an object is related to its kinetic energy - increasing the temperature increases the mass in the kinetic energy equation. Only kinetic energy can be transformed into heat energy.
1) The amount of energy transferred between two objects is considered a. heat b. specific heat...
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Two initially separated objects, make thermal contact, m_1, c_1 and T_1 are respectively the mass, specific...
Two initially separated objects, make thermal contact, m_1, c_1 and T_1 are respectively the mass, specific heat and temperature of the first object and m_2, c_2 and T_2 are respectively the corresponding of the second object. The initial temperatures are T_20 <T_10. While body 1 slowly cools, 2 heats up slowly. a) Calculate T_2 (T_1) b) Find the change in deltropy entropy as a function of T_1 c) show that deltaS is a maximum when both bodies reach thermal equilibrium
What happens when two objects are in thermal equilibrium? A. The two objects reach the average...
What happens when two objects are in thermal equilibrium? A. The two objects reach the average of their two temperatures. B. The two objects contain the same number of atoms but have different temperatures. C. The temperatures of the two objects have stopped changing even though they are at different temperatures. D. Heat no longer flows between the two objects when they are both at the same temperature.
Thermal energy storage systems commonly involve a packed bed of solid spheres through which a hot...
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When two objects with different temperatures are placed in contact, the amount of heat transferred into the colder object is proportional to i. The change in the object's temperature ii. The mass of the object iii. The specific heat of the object i. and ii. i. and iii. ii. and iïi. i., ii., and iii.
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Thermal energy storage systems commonly involve a packed bed of solid spheres through which a hot gas flows when the system is being charged. In the charging process heat is transferred from the hot gas to the spheres and it increases the thermal energy stored in the spheres. Here are some variables that are important - the convection coefficient between the particle surface and the gas is h (W/m2 K) and the particle thermophysical properties are k (W/m K), Cp...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2) through a plane wall of thickness 8, surface area A and the thermal conductivity k. The thermal resistance for the set up is + (a) AC ) (b) A (i + + ) (c) 2 (na + + n2) (d) A (na + b +h2) (2 pts) An increase in convective heat transfer coefficient over a fin will (a) increase effectiveness (b) decrease effectiveness...
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