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1. |
An automobile with projected area 2.6 m2 is running on a road with speed of 120 km per hour. The mass density and the kinematic viscosity of air are 1.2 kg/m3 and 1.5 10 5 m2 / s, respectively. The drag coefficient is 0.30. The drag force on the automobile is |
A. | 620 N |
B. | 600 N |
C. | 580 N |
D. | 520 N |
Answer» E. | |