Well, I would say "Cool" are Voiceless as i know (of consonants) produced without moving your vocal cords are "Voiceless". just like the word "Cool" for Example: u can just Put ur hand to ur throat and say the word "Cool". and then trying to say the word "Gold". well, i think u can see the different right? When u said the word "Gold" ur vocal cords should have vibrated / Moving. This is because "g" is a voiced consonant. "k" is a voiceless consonant. Here is the List : Voiced Consonants (Vocal cords moving): /b/ = above /d/ = day /g/ = gold /v/ = Very /ð/ = The / This /z/ = Zone /ʒ/ = Measure /dʒ/ = Jeans /m/ = Make /n/ = town /ŋ/ = Sing /l/ = Look /r/ = Red Voiceless Consonants (Vocal cords not moving) : /p/ = Pencil /t/ = Two /k/ = Cool /f/ = Find /ɵ/ = Thin /s/ = see /ʃ/ = She /tʃ/ = change hope this can help :))

The C in "cool" is a hard C sound, kind of like the "C" sound in "cat" or "call" or the "K" sound in "kite" or "break."

salut Alina est ce que tu peux m'apprendre l'allemand and i will help you with french????

i'm not sure exactly what you mean when you say voiced or voiceless. You pronounce the "c", but yes maybe you use full voice behind the 'oo'

You might like to use forvo.com They have MP3 recordings of native speakers saying every word. It is very useful when you don't know how something should sound.