A Porsche 944 Turbo has a rated engine power of 217 h p . 30% of the power is lo

Question

A Porsche 944 Turbo has a rated engine power of 217 hp. 30% of the power is lost in the drive train, and 70% reaches the wheels. The total mass of the car and driver is 1490kg , and two-thirds of the weight is over the drive wheels.

A-What is the maximum acceleration of the Porsche on a concrete surface where

?s=1.00?

B-If the Porsche accelerates at amax what is its speed when it reaches maximum power output?

C-How long does it take the Porsche to reach the maximum power output?

, what is its speed when it reaches maximum power output?  max

Explanation / Answer

A Porsche 944 Turbo has a rated engine power of 217hp . 30% of the power is lost in the drive train, and 70% reaches the wheels. The total mass of the car and driver is 1490 kg, and two-thirds of the weight is over the drive wheels.

1 hp = 746 watts
217 hp = 161,882 watts
70% = 113,317.4 watts

Weight = 1490 * 9.8
Friction force = ?s * (weight over drive wheels)
Friction force = 1 * ? * 1490 * 9.8 = 9734.66 N

If the drive wheels exert a force that is greater than 9734.66 N, the tires will spin. So, the maximum force that the wheels can exert = 9734.66 N

Maximum force = mass * maximum acceleration
Maximum acceleration = 9734,66

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