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KieranMcCaffrey
Joined: 17 Oct 2013 Posts: 2 Location: Canada

Posted: Thu Oct 24, 2013 10:15 pm Post subject: Physics homework help? :/ 


A student stands on the southern bank of a river that is 50m wide and has a current with a velocity of 1.1 m/s [East]. The student needs to get directly across the river using her boat.
A) In order for the student to reach her destination, what must be the resulting direction of the velocity of the boat?
B) Describe in which direction the student should point the motor so that the net velocity of the boat is the same as the direction you determined in question (A). Consider the vector components of the velocity of the boat and how they must add with the velocity of the river.
C) If the motor can push the boat with a speed of 3.8 m/s, what direction should the student point the motor to ensure she reaches her destination?
D) How long does it take the student to cross the river? 

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yann
Joined: 22 Oct 2013 Posts: 2 Location: State College

Posted: Fri Oct 25, 2013 6:57 pm Post subject: 


I prefer to help you work out the solutions than provide the solutions. So here are some questions for you:
Why is the resulting direction of the velocity of the boat different from the direction the motor should be pointed? Why won't pointing the motor to the destination (directly across the river) work?
How will the answer to B) and C) different?
D) To find the answer to D, what would you need to find first? 

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