Question
A truck driver travels a distance of 100 miles due East. He then turns at an angle of 35 degrees S of E and travels a distance of 50 miles.
What is the resultant displacement?
What is the direction?
What is the resultant displacement?
What is the direction?
Answers
Just add the two vectors.
The eastward displacement is
X = 100 + 50 cos35 = 140.96 miles
The northern displacement (assuming north is positive) is
Y = -50 sin35 = -28.68 miles
(The minus sign is there because the second vector is south of east, not north).
Total displacementis
= sqrt[(140.96)^2 + (-28.68)^2]
The direction(measured south of east) is tan^-1 (28.68/140.96) = 11.5 degrees
The eastward displacement is
X = 100 + 50 cos35 = 140.96 miles
The northern displacement (assuming north is positive) is
Y = -50 sin35 = -28.68 miles
(The minus sign is there because the second vector is south of east, not north).
Total displacementis
= sqrt[(140.96)^2 + (-28.68)^2]
The direction(measured south of east) is tan^-1 (28.68/140.96) = 11.5 degrees
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