Answer:
The efficiency of the transmission and drive mechanism is 57.5%, rounded to two decimal places.
Explanation:
We can use the following formula to calculate the efficiency of the transmission and drive mechanism:
Efficiency = (Power output / Power input) x 100%
where "Power output" refers to the amount of power delivered to the driving wheels, and "Power input" refers to the amount of power produced by the engine.
Determine the power input: The problem states that the automobile engine produces 120 horsepower, so this is our power input.
Power input = 120 hp
Determine the power output: The problem states that only 69 horsepower is delivered to the driving wheels of the car, so this is our power output.
Power output = 69 hp
Calculate the efficiency using the formula:
Efficiency = (Power output / Power input) x 100%
Substituting the values we found in steps 1 and 2, we get:
Efficiency = (69 / 120) x 100%
Simplifying this expression, we get:
Efficiency = 0.575 x 100%
Efficiency = 57.5%
Therefore, the efficiency of the transmission and drive mechanism is 57.5%, rounded to two decimal places.