The problem that follow involve straight-line motion. The time t is in seconds unless otherwise stated.
Problem
The angle θ measures the direction of the unit vector e relative to the e axis. The angular velocity of e is ω = dθ/dt = 2 rad/s, a constant. Determine the derivative de/dt when θ = 90° in two ways:
(a) Use Eq. (13.33).
(b) Express the vector e in terms of its x and y components and take the time derivative of e.
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