You have a 30-ft tall cylindrical tank with a diameter of 15 ft, which has been filled to 20 ft with jet a (rho = 6.71 lbm/gal). (a) calculate the hydrostatic pressure at the bottom of the tank. give your answer in psig. (b) calculate the total force exerted on the vertical walls of the tank due to hydrostatic pressure. give your answer in lbf.

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.