Question

ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements. In working this problem, assume the value of "g" to be 9.8 m/s2 with two (2) significant digits unless otherwise stated. If an engine operates on an input temperature of 800K and an exhaust temperature of 600K, calculate the efficiency of the engine. efficiency = %

Answer 1

25%

Step-by-step explanation:

Answer 2

Explanation: 25 %

The efficiency of an engine is defined as:

`\eta=1-(T_c)/(T_h)`

where

`T_c` is the exhaust temperature

`T_h` is the input temperature

In this problem, the exhaust temperature is 600 K, while the input temperature is 800 K, so the efficiency is

`\eta=1-(600 K)/(800 K)=1-0.75=0.25`

so, the efficiency in % is 25 %.