17.17 Disk A is attached to a motor and is made to rotate a constant angular vel

Question

17.17 Disk A is attached to a motor and is made to rotate a constant angular velocity of 300 rpm clockwise. Disk B has a mass of 5 kg and at rest when it placed in contact with disk A. k owing is 025 and neglecting bearing friction, determine the number 150 mm that B before it reaches a of revolutions executed by disk velocity. 17.18 Solve Prob. 17.17 assuming that disk B is replaced by a Fig. P17.17 6-kg wheel of radius r 150 mm and radius of gyration k 125 mm 17.19 The block C of mass m acquires a speed v after being released from rest and falling a distance h. Assuming that no slipping occurs, derive a formula for the speed v in terms of h, m, the radii ri and B, and the centroidal mass moments of inertia IA and la of the r two disks. X 17.20 Disk A weighs 8 lb, and its radius is r 10 in disk B weighs 3 lb and its radius is r 6 in. Knowing that the system is released from rest, determine the velocity of the 2-lb block C alter Fig. P17.19 and P17.20 it has fallen 5 ft

Explanation / Answer

USING CONSERVATION OF ENERGY THEOREM

(KE+PE) INITIAL=(KE+PE)FINAL

0+0=1/2IAWA2+1/2 IBWB2-MgH+1/2 Mv2

WARA=WB RB=V

FIND V FROM ABOVE EQUATION

V2= 4MgH/(MA+MB+2M)

M=2lb MA=8lb,MB=3lb

g=32feet/sec H =5feet

v=9.23 feet/sec

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