Outside air at 50°f, 1 atm, and 40% relative humidity enters an air-conditioning device operating at steady state. liquid water is injected at 45°f and a moist air stream exits with a volumetric flow rate of 1000 ft3/min at 90°f, 1 atm and a relative humidity of 40%. neglecting kinetic and potential energy effects, determine a. the rate water is injected, in lb/min.

If steel is more dense that lake water, why can a boat float

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

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.