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...
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.
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.
How do I apply conservation of energy to this problem? You pour 180 g hot coffee...
How do I apply conservation of energy to this problem? You pour 180 g hot coffee at 78.7°C and some cold cream at 7.50°C to a 115-g cup that is initially at a temperature of 22.0°C. The cup, coffee, and cream reach an equilibrium temperature of 64.0°C. The material of the cup has a specific heat of 0.2604 kcal/(kg · °C) and the specific heat of both the coffee and cream is 1.00 kcal/(kg · C). If no heat is...
1) The amount of energy transferred between two objects is considered a. heat b. specific heat...
1) The amount of energy transferred between two objects is considered a. heat b. specific heat c. thermal energy d. temperature 2) Temperature of land rises more quickly than that of the sea because ? a. soil is solid whereas water is liquid b. specific heat of soil is higher c. specific heat of soul is lower than that of water
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 is the final temperature ( 𝑇f ) of the two objects after thermal equilibrium is reached?
A 829829 g copper pan is removed from the stove at a temperature of 150 °C. It is then stacked on top of a 611611 g aluminum sheet at room temperature, 25 °C. The specific heat capacity for copper is 0.387 Jg·KJg·K and that for aluminum is 0.904 Jg·KJg·K. Assume no heat is gained or lost to the surroundings.What is the final temperature ( 𝑇f ) of the two objects after thermal equilibrium is reached?
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...
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...
Introduction If a cup of cold water is mixed with a cup of hot water, the...
Introduction If a cup of cold water is mixed with a cup of hot water, the final temperature of the mixture will be between the two initial temperatures. Using information on the temperature and volume of the hot and the cold water, the final temperature of the mixture could be predicted. This virtual experiment involves mixing of equal volume of cold and hot water and prediction of the final temperature of the mixture. Procedure Step 1 To get equal volume...
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.
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.
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...
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