Question

number 9 and 10

0 The hot and cold reservoirs of Camot engine are 293°C and 69.2°C respectively. The temperature of the hot reservoir is raised by 39°C in order to increase the efficiency of the engine. (0) What is the effidency after the increase in temperature? 434 % (6) Instead of raising the temperature of the hot reservo, the temperature of the cold reservoir is decreased by PC, what would be the efficiency of the engine? 02 P A WAFC 15.4 WAN WyNote Ak Your Tead The volume and pressure of a gas are 8.00 m and 2.1 am respectively (a) If this gas expands to three times its initial volume while the pressure is constant, determine the work done on the gas 50.4*10*5 x What is the difference between work done on the gas and work done by the gas? Check units for consistency) (b) On the other hand, this gas is compress to the fourth Wome while the pressure is constant determine the work done on the gas 12700 x Is the work done by the positive or negative when the volume decreases) O ct 14 WAT My As Youth (a) The average mpg rating for an older model of a car is 21.8 miles to the gation and it takes 7.60 X 10 of work done on the car to drive one mile Given that a galen of gasoline gives 1.19 x 10) of internal energy to the car, what is the amount of heat released to the atmosphere for each mile you drive the car? (b) the mortg 1 4 the original much herved to the more 11.00 HAF Copy 15.4 WAS ) An ideal gas m e d constant pressure of rec o xio of het theneral energy of the gas increases by , determine the change in volume of the gas

Answer 1

P 2.latom - 2.1x1.01X105 Pa 212100 Pa VE 3X8- 24 ms the gas wouk dena - PAV (212100 X2y-3) 33.936X10 wlkdene en yhe ge -33.936X P2.1atm 2.1X 1.01X13 Pa 1 2 iBkdeme by h gas PAV 212100x (6-3) 636300 J 2-6363X10

emtrgy ud tsv Imila u 21.8 5.46X 106T The meunt heat leaecd to he atmosphera t eouh mile u-w 54sx106760X10 4.698X10J 17 utmal ged t 1mite (u) enrgy C1.4x218) E 39990g2.56J