Data for the Tesla Model 3 shown in figure 1 are given in the table below. Figure 1: Tesla Model 3 Drag Coefficient, Cp Frontal Area, AF Rolling Resistance, KRR Vehicle Mass, m Vehicle effective Mass, m Acceleration due to gravity, g Density of air, PAIR 0.23 2.22m2 0.011 1680kg 1820kg 9.81m/s 1.225kg/m| The motor produces a power of 192kw, and torque of 350Nm. The transmission efficiency is 95 %. (a) Calculate the rolling resistance drag force on a level road. (b) Calculate the aerodynamic drag force when the vehicle is trav- elling at at 110km/h on a level road. (c) Calculate the power required at the wheels to drive the car at 110km/h on a level road.

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Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
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1. Data for the Tesla Model 3 shown in figure 1 are given in the table
below.
Figure 1: Tesla Model 3
Drag Coefficient, Cp
Frontal Area, Ap
Rolling Resistance, KRR
Vehicle Mass, m
Vehicle effective Mass, m
Acceleration due to gravity, g
Density of air, PAIR
0.23
2.22m2
0.011
1680kg
1820kg
9.81m/s
1.225kg/m
The motor produces a power of 192AW, and torque of 350N.. The
transmission efficiency is 95 %.
(a) Calculate the rolling resistance drag force on a level road.
(b) Calculate the aerodynamic drag force when the vehicle is trav-
elling at at 110km/h on a level road.
(c) Calculate the power required at the wheels to drive the car at
110km/h on a level road.
Question 1 continued overleaf
TURN OVER
Page 5 of 17
(d) At a velocity of 110m/s, the driver fully depresses the accelera-
tor pedal. Calculate the acceleration of the vehicle shortly after
the driver fully depresses the accelerator pedal.
i While travelling at 110m/s on a level road, the driver brakes
electrically at a rate of Im/s? for 3 seconds. Calculate the
power available for regeneration shortly after the start of the
braking.
(e)
ii Describe, using fewer than 100 words in total, three mech-
anisms which mean that not all of the kinetic energy lost by
the vehicle is made available for future use, despite the use
of regenerative braking.
(f) The car drives down a hill of gradient 1 in 5 at a constant 110km/h.
What power is required? What does this answer mean?
Transcribed Image Text:1. Data for the Tesla Model 3 shown in figure 1 are given in the table below. Figure 1: Tesla Model 3 Drag Coefficient, Cp Frontal Area, Ap Rolling Resistance, KRR Vehicle Mass, m Vehicle effective Mass, m Acceleration due to gravity, g Density of air, PAIR 0.23 2.22m2 0.011 1680kg 1820kg 9.81m/s 1.225kg/m The motor produces a power of 192AW, and torque of 350N.. The transmission efficiency is 95 %. (a) Calculate the rolling resistance drag force on a level road. (b) Calculate the aerodynamic drag force when the vehicle is trav- elling at at 110km/h on a level road. (c) Calculate the power required at the wheels to drive the car at 110km/h on a level road. Question 1 continued overleaf TURN OVER Page 5 of 17 (d) At a velocity of 110m/s, the driver fully depresses the accelera- tor pedal. Calculate the acceleration of the vehicle shortly after the driver fully depresses the accelerator pedal. i While travelling at 110m/s on a level road, the driver brakes electrically at a rate of Im/s? for 3 seconds. Calculate the power available for regeneration shortly after the start of the braking. (e) ii Describe, using fewer than 100 words in total, three mech- anisms which mean that not all of the kinetic energy lost by the vehicle is made available for future use, despite the use of regenerative braking. (f) The car drives down a hill of gradient 1 in 5 at a constant 110km/h. What power is required? What does this answer mean?
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