An older home is built in an area with a high radon flux (9.5 pCi m-2 s-1). The basement slab does not have a plastic vapor barrier so 90% of the radon flux passes into home. The house floor area is 2500 ft2 (232 m2), house volume is 20,000 ft3 (566 m3) and the air exchange rate is 1.5 ach. Neglect decay and ambient radon. Find the indoor steady-state radon concentration.

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

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?