4. [/2 Points] OBINPHYSB 5.P.005. MY NOTES I I ASK YOUR TEACHER I I PRACTICE ANOTHER A machinist wishes to insert a brass rod with a diameter of 7 mm into a hole with a diameter of 6.996 mm. By how much would the machinist have to lower the temperature (in C) of the rod to make it t the hole? \"C Need Help? _ 5. [/2 Points] OBINPHYSB 5.P.029. MY NOTES I I ASK YOUR TEACHER I I PRACTICE ANOTHER As a gasoline engine is running, an amount of gasoline containing 12,000 J of chemical potential energy is burned in 1 5. During that second, the engine does 4,000 J of work. (a) What is the engine's efficiency (in percent)? "/0 (b) The burning gasoline has a temperature of about 5,0005F (3,000 K). The waste heat from the engine ows into air at about 90F (305 K). What is the Carnot efciency (in percent) of a heat engine Operating between these two temperatures? % Need Help? _ SubmitAnswer 6. [/2 Points] OBINPHYSB 5.P.031. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An irreversible process takes place by which the entropy of the universe increases by 1.53 J/K. If the temperature of the environment in which the process occurred is 220 K, how much energy (in J) was made unavailable for useful work as a result? J Need Help