Win_odd Dhamnekar
Junior Member
- Joined
- Aug 14, 2018
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- 207
A vessel A is a sailing with a velocity of 11 knots per hour in the direction south-east and a second vessel B is sailing with a velocity of 13 knots per hour in a direction 30° of north. Find the velocity of A relative to B.
Answer: \(\displaystyle v_A=\left[\frac{11}{2}, -\frac{11}{2}\right], v_B =\left[ -\frac{13}{2}, \frac{13\sqrt{3}}{2}\right], v_{A-B}=[14.28,-19.04 ]=23.80 \) knots/hr.
Author gave answer 21.29 knots/hr in the direction 74° 47' south of east. How is that computed?
Answer: \(\displaystyle v_A=\left[\frac{11}{2}, -\frac{11}{2}\right], v_B =\left[ -\frac{13}{2}, \frac{13\sqrt{3}}{2}\right], v_{A-B}=[14.28,-19.04 ]=23.80 \) knots/hr.
Author gave answer 21.29 knots/hr in the direction 74° 47' south of east. How is that computed?