Answer:
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
I am Invisible Man's drink at snack time
I can be heard in a court or carried with you.
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
Though desert men once called me God today men call me mad. For I wag my tail when I am angry. And growl when I am glad.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?