Physics, 31.10.2019 03:31 kendrawalraven
It may seem that predicting a dynamic process such as the speed of sound should not be in the realm of equilibrium thermodynamics. in general that is correct. in this case, however, we can invoke an important principle, that of separation of time scales, to identify local equilibrium and to estimate the speed of sound in an ideal gas. assume a barrel filled with n moles of ideal gas. one end of the barrel is terminated by the flexible membrane of a loud speaker. the membrane can be driven back and forth at high frequency (let us say 0.266 khz or the middle c of piano). a)- first, we will define the property called stiffness of the gas (or bulk modulus). the relative change in volume due to the vibration of the membrane is given by δv/v. similar to the stiffness of a spring (k=- f/x), the stiffness of the gas is also defined as b = - δp/( δv/v). is stiffness an extensive or an intensive property? why?
Answers: 2
Physics, 22.06.2019 15:20
Your science teacher brings in a speaker to talk to your class about climate change. during the session, students ask a few questions. which questions are related to the current evidence on climate change
Answers: 3
Physics, 22.06.2019 17:00
Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.
Answers: 3
Physics, 22.06.2019 20:30
Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600
Answers: 2
It may seem that predicting a dynamic process such as the speed of sound should not be in the realm...
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