Figure 7.7 shows a power hacksaw. At this instant, the electric motor rotates counterclockwise and drives the free end of the motor crank (point B) at a velocity of 12 in./s. Additionally, the crank is accelerating at a rate of 37 rad/s^2.  The top portion of the hacksaw is moving toward the left with a velocity of 9.8 in./s and is accelerating at a rate of 82 in./s^2. Determine the relative acceleration of point C with respect to point B.

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2. Two rigid links are rotating in the horizontal plane as shown in the figure below. The left-most link rotates with angular rate ₁ of 4 rad/s. The end of the right-most link holds a pin which is confined to move along a slot in the other link. The length of the right-most link 72 is 0.45 m. Determine the angular rate ₂ of the second link at the instant shown. Use 0₁ = 30°, 0₂ = 60°, and r₁ = 0.6 m. 0

Pr5. A yo-yo is a toy consisting of an axle of radius r connected to two disks of radius R, and a thread looped around the axle. The end of the thread is fixed to the ceiling and the yo-yo rolls down so that the axis moves along a vertical line. (The thread does not slip on the axle.) R. a) Find the velocity of point P indicated in the figure in the moment when the axis of the yo-yo moves with velocity v. Express your answer in terms of r, R and v. b) Find the radius of curvature of the trajectory of point P in the moment shown in the figure. Give your answer in terms of r and R.