Question

A) Only statistics, and not a fundamental law of nature, prevents a lake from freezing on a warm summer day.

a. true

b. false

B) Suppose as a human I can metabolize food at a rate of 1600W, and that I find out that based on my dietary choices, that my thermodynamic efficiency while cycling can be raised from 0.25 to 0.27. How much more power in watts will I make while cycling?

Answer 1

A) True, during summer water molecule which is warmed will rises to the upper surface and colder to the bottom, so it is not possible to prevent freezing on warmday by fundamental law of nature. Only statistics can explain its possibilities.

B) Given that power =1600 W

we know that the efficiency=input/output

here we are considering 1600 W as input and 0.25 as corresponding efficiency

so output=efficiency x input=1600 x 0.25=400w

this should be equal to output at efficiency as 0.27,

0.27=1600/ out put

that is second output = 5925.92 W

That is 5525.92 W more power