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.
The relation between power and velocity is
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
The wheel on use of the power generated by the motor. Therefore, the power output is
Considering the following kinematics equation,
You need to raise a heavy block by pulling it with a massless rope. You can either (a) pull the block straight up height h, or (b) pull it up a long, frictionless plane inclined at a 15o angle until its height has increased by h. Assume you will move the block at constant speed either way. Will you do more work in case a or case b? Or is the work the same in both cases? Explain.
A 0.2 kg plastic cart and a 20 kg lead cart both roll without friction on a horizontal surface. Equal forces are used to push both carts forward a distance of 1 m, starting from rest. After traveling 1 m, is the kinetic energy of the plastic cart greater than, less than, or equal to the kinetic energy of the lead cart? Explain.
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