3-12 Using Models Use the model given to answer the questions about the object or process being modelled.
The power measured in horsepower (hp) needed to drive a certain ship at a speed of knots is modelled by
(a) Find the power needed to drive the ship at 12 knots.
(b) At what speed will 7.5-hp engine drive the ship?
The power needed to drive the ship.
It is given that the model for the power needed to drive the ship is .
Here, is the power needed to drive the ship and is the speed of the ship.
We need to find the power needed to drive the ship.
The speed of the ship is 12 knots.
It means .
Now substitute in the given model
The speed of the ship
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