Chapter 11: Q. 2 (page 900)
Chapter 11: Q. 2 (page 900)
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Get started for freeFind and graph the vector function determined by the differential equation
role="math" localid="1649566464308" . ( HINT: Start by solving the initial-value problemrole="math" localid="1649566360577" .)
As we saw in Example 1, the graph of the vector-valued function is a circular helix that spirals counterclockwise around the z-axis and climbs as t increases. Find another parametrization for this helix so that the motion is downwards.
Evaluate the limits in Exercises 42–45.
Given a differentiable vector function defined on , explain why the integralrole="math" localid="1649610238144" would be a scalar, not a vector.
Annie is conscious of tidal currents when she is sea kayaking. This activity can be tricky in an area south-southwest of Cattle Point on San Juan Island in Washington State. Annie is planning a trip through that area and finds that the velocity of the current changes with time and can be expressed by the vector function
where t is measured in hours after midnight, speeds are given in knots and point due north.
(a) What is the velocity of the current at 8:00 a.m.?
(b) What is the velocity of the current at 11:00 a.m.?
(c) Annie needs to paddle through here heading southeast, 135 degrees from north. She wants the current to push her. What is the best time for her to pass this point? (Hint: Find the dot product of the given vector function with a vector in the direction of Annie’s travel, and determine when the result is maximized.)
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