Use the Right-Hand-Rule the determine direction of the following:, the i times j
ID: 1531792 • Letter: U
Question
Use the Right-Hand-Rule the determine direction of the following:, the i times j, i times k, j times i, k times i, (i times k) times k, (j times k) times A barge is traveling due east with respect to the river at a speed of 20 m/s. The river is flowing due south at 5 m/s with respect to the earth. Determine the speed and direction of the barge with respect to the earth. The skipper of the barge is walking 5 m/s @ 30 degree north of cast with respect to the barge. What is the skipper's speed and direction with respect to the earth? An insect is walking on the skippers cap at 1 m/s @ 60 degree north of west with respect to the skipper. What is the insect's speed and direction with respect to the earth?Explanation / Answer
(a) river flow and barge movement is at right angles,
so speed of barge =squroot(20^2+5^2)
= 20.61 m/s
tan tita = 20/5
= 75.96 degree
respect to earth it is 90 - 76 = 14 degree
(b) skipper's speed = 20.61*cos30 + 5
= 22.85 m/s
angle = 30 + 14
= 44 degree
(c) skipper's speed = 20.61*cos60 + 1
= 11.31 m/s
angle = 60 +14
= 74 degree
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