Which of the following is NOT a tip for practicing a speech?
A) Only practice the speech in your mind.
B) Practice in front of a mirror.
C) Memorize the beginning and end of the speech.
D) Have the practice audience take notes.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

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

The higher the astm grain size number, the finer the gran is. a)-true b)-false