Round your final answers to three significant figures. How much work does a majo

Question

Round your final answers to three significant figures. How much work does a major-league pitcher do on the baseball when he throws a 90.0 mi/h (40.2 m/s) fastball? The mass of a baseball is 149 g. How many fastballs would a pitcher have to throw to square burn off square a 1520 Calorie meal? (1 Calorie = 1000 cal = 1 kcal = 4.186 kJ.) Assume that 78.8% of the chemical energy in the food is converted to thermal energy and only 21.2% becomes the kinetic energy of the fastballs. Express your intermediate calculations and final answers with three significant figures. Part 1 W = 120 J Part 2 out of 2 ______ fastballs

Explanation / Answer

B) Number of fastballs = (1520*4186J)/120J

= 53022 fastballs Answer

Try 53 if it doesn't work as there can be misprinting in cal and kcal

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