Agasoline engine operates at a temperature of 270°c and exhausts at 210°c. calculate the maximum efficiency of this engine. (note that the celsius scale is used.)

89.0 %
88.0 %
12.0 %
11.0 %

Hello! the efficiency of a thermal engine depends on how much of the initial input is transformed into work, Here 270°c is the input and 210°c is the output.

Then the efficiency is calculated as e = 1 - Tc/Th, where Th is the hot temperature (in this case 270°C) and Tc is the cold temperature (in this case 210°C)

First we need to write the temperatures in kelvin degrees, this can be done by adding 273.15 to the celsius scale:

Th = 270 + 273.15 = 543.15

Tc = 210 +273.15 = 483.15

then the efficiency is e = 1 - 543.15/483.15 = 0.11

if we write this as a percentage, we get an efficiency of 11%, then the fourth answer is the correct one.

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

answer: b.

explanation: