# Worksheet 4 - v C , v R and D ? 2. [8 pts] A plane wishes...

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Name (Last, First) ____________ , ____________ Recitation TA ______________ Section Number_______ Physics 151 Problem Set #4 - due ________ Answer Structure [4 pts] _________ 1. [8 pts] A camper must row directly across a river of width D to get back to his camp. In still water, he can row with speed v C (‘C’ for camper), but the river is moving with speed v R (‘R’ for river) perpendicular to the direction he wants to head in. The problem below asks you to calculate how long it will take him to cross the river. a) Draw a vector diagram showing the direction the camper must row relative to the water ( C v r ) in order for his net velocity ( ) to be directly across the river. Make sure the velocity of the river ( net v r R v r ) is also indicated in the diagram. b) What is the net speed of the camper, expressed in terms of v C and v R ? c) How long does it take for the camper to cross the river, expressed in terms of

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Unformatted text preview: v C , v R and D ? 2. [8 pts] A plane wishes to drop a package of rescue rations for a party of explorers stranded on a mountain peak. a) If the plane is approaching the peak at a horizontal speed of 50.0 m/s and is located a vertical distance of 100.0 m above the height of the peak, at what horizontal distance from the peak should the plane release the package in order for it to land on the peak? (this calculation will take at least 2 steps, write down the equations of motion for x and y motion and try to work backwards) b) What is the vertical component of the package’s velocity just before it lands on the peak? c) What is the magnitude and direction of the final velocity of the package just before it lands on the peak? Make a vector diagram showing the components of the velocity to illustrate your answer....
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## This note was uploaded on 02/20/2010 for the course ENGINEERIN 242 211 taught by Professor Tessier during the Spring '10 term at UMass (Amherst).

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Worksheet 4 - v C , v R and D ? 2. [8 pts] A plane wishes...

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