Question

Consider a Porsche 911 sports car with a mass of 1900 kg. The air drag force at highway speeds can be approximately calculated as: F_drag = 1/2 C p Av^2 where p = 1.2 kg/m^3 is the density of air, A is the front area of the car, C is the drag coefficient and v is the velocity. For the Porsche 911, we can take A - 2.3 m^2 and C = 0.28. What is the power necessary to overcome air drag at the top speed of about 60 m/s? Now we will neglect air drag. What is the average engine power necessary to accelerate the car from 0 m/s to 30 m/s in 5 seconds up a 6^degree hill? Assume that the car accelerates at a constant rate.

Answer 1

avoer d ㄅ 5