13-88 | Kinetics of a Particle | Chapter 13: Cylindrical Coordinates | Engineers Academy

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Chapter 13: Kinetics of a Particle : Force and Acceleration
Equations of Motion: Cylindrical Coordniates
Hibbeler Dynamics 14th ed

*13–88. Rod OA rotates counterclockwise with a constant
angular velocity of u = 5 rad/s. The double collar B is pin connected together such that one collar slides over the rotating rod and the other slides over the horizontal curved rod, of which the shape is described by the equation r = 1.5(2 - cos u) ft. If both collars weigh 0.75 lb, determine the normal force which the curved rod exerts on one collar at the instant u = 120. Neglect friction.

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[ganelojethrob.]

thankss...waiting for chapter 14 - chapter 19

[TTcreations]

Could you please explain How can we get the equation of the angle between r direction and teeta direction is equal to (r/(dr/dθ)).
Which means tanθ=(r/(dr/dθ))

[owenhinken]

Why is dr/dt a different number than r dot? Why don’t we multiply by theta dot like we did for r dot?

[programmingprograms]

it's the theta for me that doesnt make sense.