What is the volume of a 2.5 radius circle revolved around an axis going through rhe center of the circle?

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.