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Q.64

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 230

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Short Answer

A Porsche Turbo has a rated engine power of hp. of the power is lost in the drive train, and reaches the wheels. The total mass of the car and driver is , 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 ? Hint: What force pushes the car forward?

b. If the Porsche accelerates at , what is its speed when it reaches maximum power output?

c. How long does it take the Porsche to reach the maximum power output?

a. The maximum acceleration of Porsche is .

b. The speed at the time of maximum power output is .

c. The Porsche take to reach maximum output.

See the step by step solution

Step by Step Solution

Step 1: Content Introduction

The relation between power and velocity is

Step 2: Explanation (Part a)

The power of Porsche in Watt is

The gravitational force on the car is

The force on drive wheel is

the static friction of tyres on road is

Step 3: Explanation (Part b)

The wheel on use of the power generated by the motor. Therefore, the power output is

Step 4: Explanation (Part c)

Considering the following kinematics equation,

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