This problem examines parameter estimation. The mean of the sample is 78.3, the sample standard deviation is 4.8, and the sample size is 60. Estimate the 98% confidence interval on the mean.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.

10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.