Ruth sets out to visit her friend Ward, who lives 60 mi north and 100 mi east of
ID: 1636636 • Letter: R
Question
Ruth sets out to visit her friend Ward, who lives 60 mi north and 100 mi east of her. She starts by driving east, but after 30 mi she comes to a detour that takes her 15 mi south before going east again. She then drives east for 8 mi and runs out of gas, so Ward flies there in his small plane to get her.
What is Ward's displacement vector? Give your answer in component form, using a coordinate system in which the y-axis points north.
What is the magnitude of Ward's displacement vector?
Whatt is the direction of Ward's displacement vector, measured clockwise from the negative y axis?
Explanation / Answer
Taking y(j) as east and x(i) as north , and Ruth's location as origin,
initial locations:
0i + 0j for Ruth
100i + 60j for Ward
final locations:
0+30+8 i + 0-15 j or 38i - 15j for Ruth
so Ward's displacement vector = 38-100 i + -15-60 j = -62i - 75j
magnitude of Ward's displacement vector = ((-62)2+(-75)2)1/2 = 97.3 units
since both i and j are -ve, it is in 3rd quadrant
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