Answer Happy

5
18. A steel rod has a length L = 8m and radius r = 1.5 cm when the temperature is 20 °C. Take a = 11x10*/°C and Young's modulus of the rod to be Y = 200 x 10' N/m². (a) What is its length on a hot day when the temperature is 50 °C? [5] (b) If the rod's ends were originally fixed, then find the compression force on the rod? (5) 19. On a hot day, when the temperature was T; = 45 °C, an oil trucker fully loaded his truck from an oil station with 10,000 gal of gasoline (1 gallon = 3.8 liter). On his way to a delivery city, he encountered cold weather, where the temperature went down to Ti= 20 °C. The coefficients of volume expansion of gasoline and steel are ß = 9.6 x 10* (C) and B= 11 10* (Cº), respectively. How many gallons did the trucker deliver? [5] Hot pickup day Cold delivery day VE Movement T T 20. The initial volume, pressure, and temperature of helium gas trapped in a container with a movable piston are 2 x 10m, 150 kPa, and 300 K, respectively; see figure below. If the volume is decreased to 1.5 x 103 m and the pressure increases to 300 kPa, find the final temperature of the gas, assuming it behaves like an ideal gas. (51 Pili, Ti Prove. To