23. (a) Converting from hours to seconds, we find the angular velocity (assuming it is positive) from Eq. 10-18: ()4332.90 10 km/h 1.000 h /3600 s2.50 10rad/s.3.22 10 kmvrω−×===××(b) The radial (or centripetal) acceleration is computed according to Eq. 10-23:
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