I’ll give which person will hear the highest pitch?

person a

person b

person c

all three people will hear the same pitch.

What is the coefficient of kinetic friction μk between the block and the tabletop?

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%)

Ivana walks 2km north then turns around and walks 3km south