A steel railroad track has a length of 23 m when the temperature is 0°C.
What is the increase in the length of the
rail on a hot day when the temperature is
34°C? The linear expansion coefficient of
steel is 11 x 10-6 (°C)-1.
Answer in units of m.

An air standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes. 1-2 isentropic compression 100 kpa and 22°c to 600 kpa 2-3 v=constant heat addition to 1500 k 3-4 isentropic expansion to 100 kpa 4-1 p=constant heat rejection to initial state (a) show the cycle on p-v and t-s s (b) calculate the net work output per unit mass (409 kj/kg) (c) determine the thermal efficiency (47.9%)