(a) making use of the fact that eq. (6.21) is an exact differential expression, show that: (∂cp/∂p)t = −t(∂2v/∂t2 )p what is the result of application of this equation to an ideal gas? final pdf to printer 6.10. problems 251 smi96529_ch06_210-263.indd 251 12/26/16 06: 13 pm (b) heat capacities cv and cp are defined as temperature derivatives respectively of u and h. because these properties are related, one expects the heat capacities also to be related. show that the general expression connecting cp to cv is: cp = cv + t ( ∂ ∂t ) v ( ∂ ∂t ) p show that eq. (b) of ex. 6.2 is another form of this expression.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Two technicians are discussing the intake air temperature (iat) sensor. technician a says that the computer uses the iat sensor as a backup to the engine coolant temperature (ect) sensor. technician b says that the powertrain control module (pcm) will subtract the calculated amount of fuel if the air measures hot. who is correct

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.