Answer:
Comics6366
05/20/2020
Mathematics
Middle School
answered
a dog searching for a bone walks 3.5 m southeast, then 8.2 m at an angle 30 degrees north of east. Find the magnitude of the dog's resultant vector
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OutsideSong
Answer:
Step 1: Firstly, we draw both of the axes.
Step 2: We then draw a vector of length 3.5 m (theoretical) along the (-x) axis.
Step 3: Next, we draw a vector of length 8.2 m from the endpoint towards to top, at an angle of 60° from that point (N.B: 90-30, since it is required to make a 30°∠ with the current vertical; eventually the triangle being formed will be 90° minus the 30°.) Most importantly, the 8.2 m vector should be drawn in such a way so that it is higher than the starting point of the 3.5 m vector. )
Step 4: Lastly, we draw a 15 m vector from the endpoint of the 8.2 m vector, running above the original vector, and to the left. This one should be drawn on the left side, and must be situated far enough.
∴ Triangle 1 () is of angles 30°, 60° and 90°;
On solving for the vertical side (the slope similar to the 3.5 vector), we get
(8.2/2) m = 4.1 m
Next, we solve for the opposite side via 4.1 × √3= 7.1 m
Moving on to Triangle 2 (),
top side = (15 - 7.1) m = 7.9 m
similarly, right side = (4.1 - 3.5) m = 0.6 m
∴ last side = resultant displacement:
⇒ + (0.6)² = 7.9 m
and, direction of displacement = arcTan(y/x)
= arcTan(0.6/7.9)
= 4.3° north of west
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