Final answer:
An increase in temperature from 35°F to 50°F at a constant pressure altitude of 3,000 feet MSL will result in a higher density altitude, indicating thinner air and potentially reduced aircraft performance.
Step-by-step explanation:
The student has asked about the effect of a temperature increase on density altitude when the pressure altitude remains at 3,000 feet MSL. As temperature increases, the density of air decreases, and hence the density altitude increases. Density altitude is the altitude relative to the standard atmosphere conditions at which the air density would be equal to the current air density. A temperature change from 35°F to 50°F at a constant pressure altitude of 3,000 feet would result in an increase in density altitude. This means aircraft performance should be calculated for a higher altitude due to reduced air density, which affects engine performance, propeller efficiency, aerodynamic lift, and drag.