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A boat travels directly across a river that has a downstream current, v.
What is true about the perpendicular components of the boat’s
velocity?


a. One component equals v; the other component equals zero.
b. One component is perpendicular to v; the other component equals v.
c. One component is perpendicular to v; the other component equals v.
d. One component is perpendicular to v; the other component equals
zero.

 

(answer is C but explain why)

 Jul 21, 2019
 #1
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The boat travels directly across the river at a velocity......this component of its 'final' or resultant velocity is perpindicular to 'v'  .

   the boat ALSO travels downriver at velocity 'v' ....this component is perpindicular to its crossing velocity, but it is a component of its resultant velocity.

 

Another way:

  The boat has two perpindicular  components of its 'resultant' velocity..... the downriver current, v , and its crossing velocity (provided by its motor...or sail...or paddle etc).

 Jul 21, 2019
 #2
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Ooops.... forgot to log in (again) !      ~ EP

ElectricPavlov  Jul 21, 2019

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