(6%) Problem 2: A student foolishly attempts to stop a steel bar, of length L = 1 m and at a temperature of 20"C, from thermally expanding by attaching it to a wooden support with a nail at each end. Steel's Young's modulus is Y= 1.7 x 10 N/m and it's linear thermal expansion coefficient is a = 12.5 x 10- 1/C. Randomized Variables Y=1.7 x 10 l N/m2 a = 12.5 x 10 6 1/C* 25% Part (b) What is the value of the stress, in pascals, that develops due to a rise of temperature to 21"C? S= sin() cos() tan() 7 8 9 HOME cotan() asin() acos() E Al 4 5 6(6%) Problem 4: Assume a person has lungs that can hold V = 5.5 L of air (at 1 atm), and their body temperature is currently T= 38' C. @theexpertta.com - tracking id: 9N69-4E-C3-45-84AD-30567. In accordance with Expert TA's Terms of Service. copying this information to any solutions sharing website is strictl Doing so may result in termination of your Expert TA Account. * How many moles of air does the average human have in their lungs when they breath in? Grade Sum n= Deductions Potential