A lawn mower has a flat, rod-shaped steel blade that rotates about its center. The mass of the blade is 0.65 kg and its length is 0.55 m. You may want to review (Pages 314 - 318) . a. What is the rotational energy of the blade at its operating angular speed of 3550 rpm? Express your answer using two significant figures. Kr = J B. If all of the rotational kinetic energy of the blade could be converted to gravitational potential energy, to what height would the blade rise? y= _____ m

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Chapter1: Units, Trigonometry. And Vectors
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A lawn mower has a flat, rod-shaped steel blade that rotates about its center. The mass of the blade is 0.65 kg and its length is 0.55 m. You may want to review (Pages 314 - 318) .

a. 

What is the rotational energy of the blade at its operating angular speed of 3550 rpm?        
Express your answer using two significant figures.
 
 
 
 
Kr =
 
J

B.  

If all of the rotational kinetic energy of the blade could be converted to gravitational potential energy, to what height would the blade rise?
y= _____ m
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