A cup of soy milk weighs 243grams=0.243kg and contains 131 (nutritional) calorie

Question

A cup of soy milk weighs 243grams=0.243kg and contains 131 (nutritional) calories. If one drinks the cup in three sips each time lifting the 40 cm =0.4 meters and drinking a third of it. How much work is expanded on the act of drinking. Considering the work expanded in the drinking what is the net caloric intake resulting from drinking this cup ? Neglect the weight of the cup itself.

HINT: it is important to keep track of the units of work(Newtons) and convert them to energy units of nutritional calories. To calculate the mass must be in Kg and distance in meters

Explanation / Answer

work in first sip=0.243*9.8*0.4=0.95256

work in second sip=0.243*(2/3)*9.8*0.4=0.63504

work in first sip=0.243*(1/3)*9.8*0.4=0.31752

work is expanded on the act of drinking=0.95256+0.63504+0.31752=1.90512joules =1.90512*0.239=0.455calorie

net=131-0.455=130.54calorie

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