On a large lake without waves, how far from shore is a sailboat when the top of its 7-m mast disappears from the view of a person whose eye height is 1.7 m above the water’s edge?Express your answer to three significant figures and include appropriate units.

D = 15.202 km

Explanation:

Given:

- The height of the sail-boat mast below wave h_1 = 7 m

- The level of eyesight above water's edge h_2 = 1.7 m

Find:

how far from shore is a sailboat

Solution:

- The distance from shore ( person ) to sailboat for a lake with waves is given by the following expression:

                       D = sqrt ( h_1 / 0.0675) + sqrt ( h_2 / 0.0675 )

Where, D is the curved distance along earth's surface:

- Plug in values and evaluate:

                       D = sqrt ( 7 / 0.0675) + sqrt ( 1.7 / 0.0675 )        

                       D = 10.18350 + 5.01848

                       D = 15.202 km

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