Preheating air by steam for use in a dryer. an air stream at 32.2°c is to be used in a dryer and is first preheated in a steam heater, where it is heated to 65.5°c. the air flow is 1000 kg mol/h. the steam enters the heater saturated at 148.9°c, is condensed and cooled, and leaves as a liquid at 137.8°c. calculate the amount of steam used in kg/h.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.