Your answer is partially correct. Try again. ll water. (a) If she is crossing a

Question

Your answer is partially correct. Try again. ll water. (a) If she is crossing a river where the current is 3.40 km/h, In what direction must her boat be headed if she wants to river is 6.80 km wide, how long will she starting point. How long will she take? (d) How long will she the boat if she wants to cross in the shortest possible time, and () what is that time opposite her starting point? Express your answer as an angle with respect to the line perpendicular to the river, positive if ake to cross the river? (c) Suppose that instead of crossing the river she rows 3.40 km down the river l down the river. (b) If the take to row 3.40 km up the river and then back to her starting point? (e) In what direction should she head and then back to her (a) Number 30 (b) Number (c) N Units (d) Number (e) Number D (n) N Units

Explanation / Answer

A) = sin-1(3.4/6.8) = 30 degrees

B) Time it will take = 6.8/6.8*cos(30) = 1.15 hours

C) Time taken = 3.4/(6.8+3.4) + 3.4/(6.8-3.4) = 1.3333 hr

D) Time taken = 3.4/(6.8+3.4) + 3.4/(6.8-3.4) = 1.3333 hr

e) To cross in the minimum possible time, angle should be zero so that cos component is maximised

f) shortest time = 6.8/6.8*cos 0 = 1 hour

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