1)Assume that the water has uniform velocity, represented above by the vector la
ID: 1411330 • Letter: 1
Question
1)Assume that the water has uniform velocity, represented above by the vector labeled C. The rowing speed of the girl and a set of possible orientation of her boat are also shown. Select the direction (i.e., K, or F, or ...) in order to cross the river in the shortest time. (Notice that the number of tries is reduced.) It is not J.
2)For which rowing orientation will the girl land on the opposite shore directly across from her starting position, neither upstream or downstream. (Notice that the number of tries is reduced.)
3) Select an answer for each below. It can only be greater than, less than or equal to.
A) Greater than Less than Equal to Time to row across for F is .... for J.
B)Greater than Less than Equal to The distance traveled in crossing for D is .... for H.
C) Greater than Less than Equal to Time to row across for K is .... for B.
D) Greater than Less than Equal to Time to row across for K is .... for J.
E) Greater than Less than Equal to For an observer on shore, the speed of the boat for A is .... for H.
Explanation / Answer
1) Here , for the shortest time to cross the river ,
she should row perpendicular to the direction of flow of river ,
hence , the correct flow vector is A
2)
for going at the oposite point , the compoment of her velocity in the direction of flow should be zero.
hence , she should row in J
3)
A) Time to row across for F is less than for J
B)
The distance traveled in crossing for D is greater than for H.
C)Time to row across for K is greater than for B.
D)
Time to row across for K is equal for J.
E)
For an observer on shore, the speed of the boat for A is greater for H.
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