# airplane

## 725 Centroid of windlift of airplane wing | Centroid of area

## 239 Resultant of lift on the wing of an airplane

**Problem 239**

The 16-ft wing of an airplane is subjected to a lift which varies from zero at the tip to 360 lb per ft at the fuselage according to w = 90x^{1/2} lb per ft where x is measured from the tip. Compute the resultant and its location from the wing tip.

## 33-34 Time Rates: A car traveling east and airplane traveling north

**Problem 33**

From a car traveling east at 40 miles per hour, an airplane traveling horizontally north at 100 miles per hour is visible 1 mile east, 2 miles south, and 2 miles up. Find when this two will be nearest together.