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As of 2008 the circumference of a regulation size baseball is between nine and nine and a quarter inches which converts to between about 7.3 cm and 7.5 cm in diameter according to the official rules of Major League Baseball (MLB).
According to mlb.com, baseball bat's cannot exceed 42 inches, or 106.68 cm (1 inch = 2.54 cm). From Wikipedia, the average mass of a baseball bat is 0.96 kg. You can check the mass by weighing an average baseball bat, then dividing that number by 9.8 m/s^2. If you need any more help, don't hesitate to ask! According to mlb.com, baseball bat's cannot exceed 42 inches, or 106.68 cm (1 inch = 2.54 cm). From Wikipedia, the average mass of a baseball bat is 0.96 kg.