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TonyTheTech
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Homework Statement
The quality of the image is bad so here's the statement:
For an interval of motion the drum of radius b turns clockwise at a constant rate ω in radians per second and causes the carriage P to move to the right as the unwound length of the connecting cable is shortened. Use polar coordinates r and θ and serive expressions for the velocity v and acceleration a of P in the horizontal guide in terms of the angle θ. Check your solution with time of the relation x2+h2=r2
Homework Equations
I first found that the velocity of the carriage is v=bω/sin(θ)
The Attempt at a Solution
I attempted to directly derivate the equation which give me -bωcos(θ)/sin2(θ)
However, in the book answers, the answer is supposer to be b2ω2/h *cot3(θ).
I think I have to do something with the vectors, like derivate v=vrer + vθeθ but I don't understand much.