Answer Happy

01 h The figure shows an impact tester used in studying material response to shock loads. The 30-kg pendulum is released from rest and swings through the vertical with negligible resistance. At the bottom most point of the ensuing motion, the pendulum strikes a notched material specimen A. After impact with the specimen, the pendulum swings upward to a height h' = 950 mm. The impact-energy capacity of the pendulum is 400 J. Determine the angular velocity of the pendulum just before impact with the specimen. The center of mass distance from O and the radius of gyration ko of the pendulum about are both 890 mm. (Note: Positioning the center of mass directly at the radius of gyration eliminates shock loads on the bearing at Oand extends the life of the tester significantly.) O 6.22 rad/sec 04.85 rad/sec 3.31 rad/sec