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help with work/calories c/o physical science

  walking wich is a type of work requires that  you burn about 6 calories per minute.  according to the first law of thermodynamics how many calories must you use up from eating food or stored fat to walk 30 minutes?
 
a.  6 calories
b.  30 calories
c.  36 calories
d.  180 calories
 
thanks
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1 Answer

To walk 30 minutes, you will need 6 calories of fat, protein, or carbohydrates stored for every minutes. This
 
mean you will need 30 * 6 = 180 calories of food stored for the walk.