Physics, 28.01.2020 15:45, Babygirll41
Ted is a high school student. he is very good at math, but he is not a very good english student. he likes all of his teachers; he thinks they are fair and want him to learn. on tuesday, ted was sitting in his english classroom, listening to his teacher’s lecture. the teacher asked the class a question. he called on ted. ted had not been paying attention. his palms began to sweat, and his heart rate increased. he felt embarrassed that he did not know the answer. on wednesday, ted was asked to answer another question in his math classroom. even though this time he was listening and knew the answer, his palms began to sweat and his heart rate increased. why did ted’s palms sweat and heart rate increase on wednesday? a. ted associated his embarrassment with being in high school. b. ted associated his math teacher with feelings of embarrassment. c. ted was not completely sure that his answer was correct. d. ted associated being asked a question with embarrassment.
Answers: 3
Physics, 22.06.2019 03:30, zahradawkins2007
As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.
Answers: 3
Physics, 22.06.2019 09:50, blaqsafire9291
If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?
Answers: 3
Ted is a high school student. he is very good at math, but he is not a very good english student. he...