In a wind tunnel the pressure on the top surface of a modelairplane wing is 8.6

Question

In a wind tunnel the pressure on the top surface of a modelairplane wing is 8.6 x 104 N/m2 and thepressure on the bottom surface is 8.8 x 104N/m2. If the total area of the top and bottom surfacesof each wing is 1.8 m2 ,what is the total lift on themodel airplane? A.) 6.9 x 104 N B.) 7.2 x 103 N C.) 7.9 x 103 N D.) 6.8 x 102 N E.) 8.3 x 101 N In a wind tunnel the pressure on the top surface of a modelairplane wing is 8.6 x 104 N/m2 and thepressure on the bottom surface is 8.8 x 104N/m2. If the total area of the top and bottom surfacesof each wing is 1.8 m2 ,what is the total lift on themodel airplane? A.) 6.9 x 104 N B.) 7.2 x 103 N C.) 7.9 x 103 N D.) 6.8 x 102 N E.) 8.3 x 101 N

Explanation / Answer

the total lift = pressure difference * area = (8.8 x 104N/m2 - 8.6 x 104 N/m2)*2*1.8m2 = 7.2 x 103 N answer: B

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