The pressure of a mass of air at 20S1U1P1$\circ$S1S1P0C is halved adiabatically.If the ratio of Cp to Cv for air is 1.41,calculate the resulting volume.

A) 2.66 times the original volume B) 1.63 times the original volume C) 2.00 times the original volume D) 0.50 times the original volume E) 0.61 times the original volume A) 2.66 times the original volume B) 1.63 times the original volume C) 2.00 times the original volume D) 0.50 times the original volume E) 0.61 times the original volume

For most metals,the heat capacity goes as C = $\gamma$T + AT3 at low temperatures (~ 100 K),whereas insulators only has the T3 term.Both $\gamma$ and A are constants.The two terms in the expression for C suggests

A) there are at least two degrees of freedom in metals. B) there are two independent mechanisms for heat to be absorbed or released in metals. C) that there are two kinds of heat that are absorbed by metals. D) that thermal energy is transferred to metals differently than insulators. E) nothing.It just happens that way. A) there are at least two degrees of freedom in metals. B) there are two independent mechanisms for heat to be absorbed or released in metals. C) that there are two kinds of heat that are absorbed by metals. D) that thermal energy is transferred to metals differently than insulators. E) nothing.It just happens that way.

A 2.0-kg mass of iron (specific heat = 0.12 kcal/kgS1U1P1$\circ$S1S1P0C)at a temperature of 430S1U1P1$\circ$S1S1P0C is dropped into 0.4 kg of ice and 0.4 kg of water both at 0S1U1P1$\circ$S1S1P0C.With no heat losses to the surroundings,the equilibrium temperature of the mixture is approximately

A) 0S1U1P1$\circ$S1S1P0C B) 100S1U1P1$\circ$S1S1P0C C) 23S1U1P1$\circ$S1S1P0C D) 69S1U1P1$\circ$S1S1P0C E) 87S1U1P1$\circ$S1S1P0C A) 0S1U1P1$\circ$S1S1P0C B) 100S1U1P1$\circ$S1S1P0C C) 23S1U1P1$\circ$S1S1P0C D) 69S1U1P1$\circ$S1S1P0C E) 87S1U1P1$\circ$S1S1P0C

Exam 18: Heat and the First Law of Thermodynamics

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From the measured molar heat capacities and the equipartition theorem,for a polyatomic gas molecule the number of degrees of freedom due to translational motion are

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Question 61

The equation of state for a certain gas under isothermal conditions is where the units are SI.The work done by this gas as its volume increases isothermally from 1 L to 10 L is approximately

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Question 62

In an adiabatic reversible compression of an ideal gas,there is a decrease in

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Question 63

The pressure of a mass of air at 20^$\circ$C is halved adiabatically.If the ratio of C_p to C_v for air is 1.41,calculate the resulting volume.

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Question 64

Some water is poured into some ice.What will happen to the water? Assume no heat loss to the surrounding.

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Question 65

In a system composed of gas contained in a cylinder fitted with a piston,an adiabatic expansion causes the temperature of the gas to drop because

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Question 66

For most metals,the heat capacity goes as C = $\gamma$ T + AT³ at low temperatures (~ 100 K),whereas insulators only has the T³ term.Both $\gamma$ and A are constants.The two terms in the expression for C suggests

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Question 67

Use the following to answer the question: -The graph shows the temperature of a 1.0-g sample of material as heat is added to it.The material is initially a solid at 10ºC.The pressure remains constant,and there is no chemical change.The specific heat of the liquid phase is

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Question 68

A container contains a 200 mL of 100% proof alcohol (i.e.,it has 50% ethyl alcohol and 50% water by volume)at the boiling point of the alcohol.How long does it take to distill (boil)all the alcohol if heat is supplied at a rate of 100 W? (The density and latent heat of vaporization of ethyl alcohol are 0.81 g/cm³,and 879 kJ/kg.)

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Question 69

A system is said to go through an isothermal process if it

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Question 70

Use the following to answer the question: $Use the following to answer the question: -The internal energy for a diatomic gas is given by U = 5nRT/2.Calculate the internal energy of a 100 g mixture of oxygen (20%)and nitrogen (80%)gas at 25 \circ C.(The molar weight of O2 = 32 g,and the molar weight of N2 = 28 g.)$ -The internal energy for a diatomic gas is given by U = 5nRT/2.Calculate the internal energy of a 100 g mixture of oxygen (20%)and nitrogen (80%)gas at 25^$\circ$C.(The molar weight of O₂ = 32 g,and the molar weight of N₂ = 28 g.)

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Question 71

A state variable is one that allows other variables to be determined using a relationship.Which of the following variables are state variables?

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Question 72

In a certain thermodynamic process,20 cal of heat are removed from a system and 30 cal of work are done on the system.The internal energy of the system

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Question 73

In a certain thermodynamic process,1000 cal of heat are added to a gas confined in a cylinder.At the same time,1000 J of work are done by the gas as it expands.The increase in internal energy of the gas is

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Question 74

When a gas is compressed adiabatically,

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Question 75

The first law of thermodynamics is most closely related to

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Question 76

A 2.0-kg mass of iron (specific heat = 0.12 kcal/kg^$\circ$C)at a temperature of 430^$\circ$C is dropped into 0.4 kg of ice and 0.4 kg of water both at 0^$\circ$C.With no heat losses to the surroundings,the equilibrium temperature of the mixture is approximately

(Multiple Choice)

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Question 77

In a certain process,500 cal of heat are supplied to a system consisting of a gas confined in a cylinder.At the same time,500 J of work are done by the gas by expansion.The increase in thermal energy of the gas is approximately

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Question 78

A system absorbs heat Q and has an equal amount of positive work done on it.What is the change in the internal energy of the system?

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Question 79

A 6.0-g lead bullet traveling at 300 m/s penetrates a wooden block and stops.If 50 percent of the initial kinetic energy of the bullet is converted into thermal energy in the bullet,by how much does the bullet's temperature increase? (The specific heat of lead is 128 J/kg · K.)

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Question 80

Showing 61 - 80 of 100

Exam 18: Heat and the First Law of Thermodynamics

From the measured molar heat capacities and the equipartition theorem,for a polyatomic gas molecule the number of degrees of freedom due to translational motion are

The equation of state for a certain gas under isothermal conditions is where the units are SI.The work done by this gas as its volume increases isothermally from 1 L to 10 L is approximately

In an adiabatic reversible compression of an ideal gas,there is a decrease in

The pressure of a mass of air at 20 ∘\circ∘ C is halved adiabatically.If the ratio of Cp to Cv for air is 1.41,calculate the resulting volume.

Some water is poured into some ice.What will happen to the water? Assume no heat loss to the surrounding.

In a system composed of gas contained in a cylinder fitted with a piston,an adiabatic expansion causes the temperature of the gas to drop because

For most metals,the heat capacity goes as C = γ\gammaγ T + AT3 at low temperatures (~ 100 K),whereas insulators only has the T3 term.Both γ\gammaγ and A are constants.The two terms in the expression for C suggests

Use the following to answer the question: -The graph shows the temperature of a 1.0-g sample of material as heat is added to it.The material is initially a solid at 10ºC.The pressure remains constant,and there is no chemical change.The specific heat of the liquid phase is

A system is said to go through an isothermal process if it

Use the following to answer the question: -The internal energy for a diatomic gas is given by U = 5nRT/2.Calculate the internal energy of a 100 g mixture of oxygen (20%)and nitrogen (80%)gas at 25 ∘\circ∘ C.(The molar weight of O2 = 32 g,and the molar weight of N2 = 28 g.)

A state variable is one that allows other variables to be determined using a relationship.Which of the following variables are state variables?

In a certain thermodynamic process,20 cal of heat are removed from a system and 30 cal of work are done on the system.The internal energy of the system

In a certain thermodynamic process,1000 cal of heat are added to a gas confined in a cylinder.At the same time,1000 J of work are done by the gas as it expands.The increase in internal energy of the gas is

When a gas is compressed adiabatically,

The first law of thermodynamics is most closely related to

A 2.0-kg mass of iron (specific heat = 0.12 kcal/kg ∘\circ∘ C)at a temperature of 430 ∘\circ∘ C is dropped into 0.4 kg of ice and 0.4 kg of water both at 0 ∘\circ∘ C.With no heat losses to the surroundings,the equilibrium temperature of the mixture is approximately

In a certain process,500 cal of heat are supplied to a system consisting of a gas confined in a cylinder.At the same time,500 J of work are done by the gas by expansion.The increase in thermal energy of the gas is approximately

A system absorbs heat Q and has an equal amount of positive work done on it.What is the change in the internal energy of the system?

A 6.0-g lead bullet traveling at 300 m/s penetrates a wooden block and stops.If 50 percent of the initial kinetic energy of the bullet is converted into thermal energy in the bullet,by how much does the bullet's temperature increase? (The specific heat of lead is 128 J/kg · K.)

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The pressure of a mass of air at 20^$\circ$C is halved adiabatically.If the ratio of C_p to C_v for air is 1.41,calculate the resulting volume.

For most metals,the heat capacity goes as C = $\gamma$ T + AT³ at low temperatures (~ 100 K),whereas insulators only has the T³ term.Both $\gamma$ and A are constants.The two terms in the expression for C suggests

A 2.0-kg mass of iron (specific heat = 0.12 kcal/kg^$\circ$C)at a temperature of 430^$\circ$C is dropped into 0.4 kg of ice and 0.4 kg of water both at 0^$\circ$C.With no heat losses to the surroundings,the equilibrium temperature of the mixture is approximately