A student amuses herself by spinning her pen around her thumb (see figure below).

Estimate the rotational kinetic energy of the pen. She wonders if she can count this amusement as her aerobic activity for the day. Estimate the amount of energy she consumes in spinning the pen for 1 hour.

Estimate the mass of the pen. 

 kg 

Estimate the length of the pen. 

 m 

Estimate the time it take for the pen to make one full rotation. 

 s 

Calculate the rotational kinetic energy of the pen. (Use your estimates.) 

 J 

Calculate the amount of energy she consumes in spinning the pen for 1 hour. (Use your estimates.) 

 cal 

Compare this amount with chewing gum, which consumes about 11 calorie/h. 

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