Solution of task 7.9.9 from the collection of Kepe OE

Solution of task 7.9.9 from the collection of Kepe OE

7.9.9
The point moves in the plane. The equation of the polar angle? = 0.3t. Determine the polar radius r at the time when the polar angle reaches 3 rad, if dr / dt = 0.4 m / s. At t0 = 0, the radius r0 = 0. (Answer 4)

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