The drag force f on a boat varies jointly with the wet surface area a of the boat and the square of the speed s of the boat. a boat with a wet surface area of 50ft2 traveling at 7mph experiences a drag force of 98n . find the wet surface area of a boat traveling 7.5mph and experiencing a drag force of 135n .

Variation can be direct, inverse or joint.

The wet surface area is 60 square feet

The variation is given as:

Express as an equation

Make k the subject.

Rewrite as:

Where:

So, we have:

Make A2 the subject

Hence, the wet surface area is 60 square feet

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1696 hundred thousand

step-by-step explanation:

"it's not the heat, it's the humidity".   that's a partly valid phrase you may have heard in the summer, but it's actually both.   the heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature.   this has important considerations for the human body's comfort.   when the body gets too hot, it begins to perspire or sweat to cool itself off.   if the perspiration is not able to evaporate, the body cannot regulate its temperature.   evaporation is a cooling process.   when perspiration is evaporated off the body, it effectively reduces the body's temperature.   when the atmospheric moisture content (i.e. relative humidity) is high, the rate of perspiration from the body decreases.   in other words, the human body feels warmer in humid conditions.   the opposite is true when the relative humidity decreases because the rate of perspiration increases.   the body actually feels cooler in arid conditions.   there is direct relationship between the air temperature and relative humidity and the heat index, meaning as the air temperature and relative humidity increase (decrease), the heat index increases (decreases).

step-by-step explanation: