Problem 4.18* Mary likes to row her little boat. In still water, she rows at a s

Question

Problem 4.18* Mary likes to row her little boat. In still water, she rows at a speed of 4 4.8 m/s. . Today, Mary is rowing across a 70 m wide river. The river flows west at 2.8 m/s .
Part A Mary is on the south bank of the river. If Mary points her boat straight north, where will she land? Express your answer using two significant figures.
Part B Now that Mary is on the north bank, she wishes to row to a point on the south bank that is directly south of her present location. What direction should she point her boat?

= meters west of where she started

Explanation / Answer

Part A)

Apply d = vt for Mary to row

70 = (4.8)(t)

t = 14.56 sec

For the river, d = vt

d = (2.8)(14.56)

d = 41

Part B)

Apply tan(angle) = 4.8/2.8

angle = 59.7 degrees (or round to 60 degrees) South of East

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