4. [0/2 Points] DETAILS PREVIOUS ANSWERS OBINPHYS8 5.P.005. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A machinist wishes to insert an iron rod with a diameter of 8 mm into a hole with a diameter of 7.996 mm. By how much would the machinist have to lower the temperature (in .C) of the rod to make It fit the hole? X "C Need Help? Read It 5. [0/2 Points] DETAILS PREVIOUS ANSWERS OBINPHYS8 5.P.029. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER As a gasoline engine is running, an amount of gasoline containing 9,600 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,200 J of work. (a) What is the engine's efficiency (in percent)? * % (b) The burning gasoline has a temperature of about 4,100F (2,500 K). The waste heat from the engine flows into air at about 90F (305 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures? Need Help? Read It