For an object that is 12 in tall (1 foot), what is the magnitude of the pressure differential from bottom to top, when the object is placed in a) air (density = 1 kg/m3) and b) submerged in water (density = 1000 kg/m3). Give each answer to 1 sig fig. Note that there are at least a couple unit conversions - use Google if you don't know the values. Give your answer in units of psi (pounds per square inch), and remember to include the units in your answer. Assume that the object has a density of 500 kg/m3. Will the object sink or float in each of a) air, and b) water?