Answer:
60
Explanation:
We start calculating the total work required to climb up the Everest.
The total energy would be,
[tex]W=mgh[/tex]
Where m is the mass of the person (75kG)
g is the gravitational force (9.8m/s^2)
h is the high (8850m)
[tex]W= (75)(9.8)(8850) = 6.5*10^6J[/tex]
From our problem we have that only 11% of chemical energy ([tex]\alpha[/tex])is converted to mechanical energy([tex]\Gamma[/tex]),
[tex]11\%\alpha = \Gamma[/tex]
For this situation,
[tex]\Gamma=W[/tex]
[tex]11\%\alpha = W[/tex]
[tex]\alpha = \frac{W}{11\%}[/tex]
[tex]\alpha = \frac{6.5*10^6} {11\%}[/tex]
[tex]\alpha = 59.1*10^{6}[/tex]
We know that only 1 piece of bread release [tex]1.0*10^6J[/tex], then
[tex]\eta * (1*10^6) = 59.1*10^{6}[/tex]
[tex]\eta = \frac{59.1*10^6}{1*10^6}[/tex]
[tex]\eta = 59.1[/tex]
Therefore it is necessary 60 breads
