Physics Exam 1

Question 1

What is the zeroth law of thermodynamics?

Answer 1

Question 2

How do you convert celsuis to fahrenheit?

Answer 2

Question 3

What is the equation for linear expansion relating temperature change and length change of a material?

Answer 3

Question 4

What is the equation relating change in volume and change in temperature for a material?

Answer 4

Beta= 3 alpha

Question 5

What is the equation relating heat, heat capacity, and temperature of an object?

Answer 5

Question 6

What is the equation relating heat, heat capacity, mass, and temperature?

Answer 6

Question 7

What is the heat of transformation and the equation for the heat of transformation?

Answer 7

Heat of vaporization= LV (liquid <-> gas)

Heat of fusion= LF (solid <-> liquid)

Question 8

What is the equation for work of a closed system involving a gas?

Answer 8

Question 9

What is the first law of thermodynamics?

Answer 9

Question 10

What is an adiabatic process?

Answer 10

An adiabatic process is one that occurs so rapidly or occurs in a system that is so well insulated that no transfer of energy as heat occurs between the system and its environment

Question 11

What is the change in internal energy of a constant-volume process?

Answer 11

Question 12

What is the change in internal energy of a system undergoing free expansion?

Answer 12

Question 13

What is the ideal gas law?

Answer 13

Question 14

What is the Boltzman constant? (k)

Answer 14

Question 15

What is the equation for work in an ideal, isothermal process (where T is constant)

Answer 15

This equation is derived from taking the integral of the definition of work using pv=nrt to replace p

Question 16

What is the value of work in a constant volume process?

Answer 16

W=0

Question 17

What is the work in a process where the pressure is held constant?

Answer 17

Question 18

What is the equation for the root mean square speed of a gas?

Answer 18

Question 19

What is the equation for the kinetic energy of a gas?

Answer 19

Question 20

What is the equation for the mean free path of a molecule?

Answer 20

Question 21

What is the equation for average speed of a molecule?

Answer 21

Question 22

What is the equation for the most probable speed for a molecule?

Answer 22

Question 23

What is the equation for heat of a gas with constant volume?

Answer 23

Question 24

What is the molar specific heat at constant volume for monoatomic,diatomic, and polyatomic molecules?

Answer 24

(3/2)R monoatomic

(5/2)R diatomic

3R polyatomic

Question 25

What is the equation for the change in internal energy of an ideal gas?

Answer 25

Question 26

What is the molar specific heat at constant pressure? (Cp)

Answer 26

Cp= Cv+R This Cp is greater than the molar specific heat at constant volume CV, because energy must now be supplied not only to raise the temperature of the gas but also for the gas to do work

Question 27

If an irreversible process occurs in a closed system, what can we say about the entropy?

Answer 27

Question 28

What is the equation for the change in entropy?

Answer 28

Question 29

What is the equation for entropy that is derived from the equations for change in internal energy?

Answer 29

Question 30

What is the second law of thermodynamics?

Answer 30

Question 31

What is the equation for the force due to entropy?

Answer 31

Question 32

What is the equation for work of a carnot engine?

Answer 32

Question 33

What is the equation for efficiency of a carnot engine?

Answer 33

Can also be written as 1-(Low Temp/High Temp)

Question 34

What is the equation for efficiency of a refrigerator?

Answer 34

Also can be written as Low Temperature/ (High Temp- Low Temp)

Question 35

What is true in a reversible isothermal expansion?

Answer 35

Q=W so change in entropy equals W/T