An engine of 98 horsepower maximum is running at 75 percent power. How much horsepower is being developed?

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To determine the horsepower being developed by an engine running at a certain percentage of its maximum power, you can use a simple calculation. The formula is to multiply the maximum horsepower by the percentage of power (expressed as a decimal).

In this case, the engine has a maximum output of 98 horsepower, and it is operating at 75 percent power. To find the effective horsepower, you would calculate it as follows:

  1. Convert the percentage to a decimal: 75 percent is equivalent to 0.75.

  2. Multiply the maximum horsepower by this decimal:

(98 \text{ horsepower} \times 0.75 = 73.5 \text{ horsepower}).

Thus, the horsepower being developed by the engine when running at 75 percent power is 73.5. This aligns with the correct answer chosen, which indicates an understanding of basic power and performance calculations relevant to engine operation in aviation and other fields.

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