Answer:
[tex]N = 15 times[/tex]
Yes it is realistic
Explanation:
Each time the energy that is used to raise the mass is given as
[tex]U = mgh[/tex]
here we know that
m = mass of the object = 5.5 kg
h = height = 38 cm
now we have
[tex]U = mgh[/tex]
[tex]U = (5.5)(9.81)(0.38)[/tex]
[tex]U = 20.5 J[/tex]
now each time when mass is raised only 20% food energy is converted into work done to raise the mass
so total burn calorie in each lift of the mass is given as
[tex]20.5 = 0.20E[/tex]
[tex]E = 102.5 J[/tex]
now we know that total food energy that is needed to burn is given as
[tex]U = 370 calorie[/tex]
[tex]U = 1548 J[/tex]
so total number of lifts required is given as
[tex]N = \frac{1548}{102.5}[/tex]
[tex]N = 15 times[/tex]
Yes it is realistic