A particle moves in the x-y plane according to r(t) = (4 + 3…
A particle moves in the x-y plane according to r(t) = (4 + 3t3) i + (2 + 2t4) j. Here distances are measured in meters and times in seconds. At t = 2 seconds, what angle does the velocity of the particple make with the x-axis?
Read DetailsA river flows due east at 1 m/s and is 75 meters wide. A sw…
A river flows due east at 1 m/s and is 75 meters wide. A swimmer is on the south shore and wishes to cross to a point directly opposite on the north shore. If the swimmer moves at 1.6 m/s relative to the water, how long will it take them to cross the river?
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