An f-15 supersonic fi ghter aircraft is in a rapid climb. at the instant it passes through a standard altitude of 25,000 ft, its time rate of change of altitude is 500 ft/s, which by defi nition is the rate-of-climb, discussed in ch. 6. corresponding to this rate-of-climb at 25,000 ft is a time rate of change of ambient pressure. calculate this rate of change of pressure in units of pounds per square foot per second.