One of the most efficient engines ever developed operates between 2100 K and 700 K. Its actual efficiency is 40%. What percentage of its maximum possible efficiency is this?

One of the most efficient engines ever developed operates between 2100

1.	One of the most efficient engines ever developed operates between 2100 K and 700 K. Its actual efficiency is 40%. What percentage of its maximum possible efficiency is this?
Answer» Solution :`T_(1) = 2100K, T_(2)= 700 K` The maximum possible efficiency `= eta = (T_(1) - T_(2))/( T_(1)) ` `= (2100 - 700)/(2100) = 0.667` `= 66.7%` ACTUAL efficiency `= 40%` `("Actual efficiency")/(" Maximum efficiency") = ( 40 xx 100)/(100 xx 66. 67) = 60%`