Problem $2$

The power screw turns at a speed which gives the threaded collar C a velocity of $0\mathrm{.}8f\frac{t}{sec}$ vertically

down. At the moment shown, collar C is decelerating downward at a rate of $1f\frac{t}{se{c}^2}.$ Determine the

angular velocity of the slotted arm when $=30.$ Also find the velocity of slider $C$ relative to the slotted

arm. USE THE ROTATING AXES VELOCITY EQUATION and remember to specify the origin, axes directions, and

rate of rotation $()$ of the rotating axes. $($Answer: ${}_{OB}=0\mathrm{.}4ra\frac{d}{s}CCW,r_{xy}^{}=0\mathrm{.}4\frac{ft}{s}$fromC to $O)$