In which medium does sound travel fastest. a. salt water b. fresh water c. air d. cast iron

Could we see a galaxy that is 20 billion light-years away?

Astep up transformer has 250 turns on its primary and 500 turns on it secondary. when the primary is connected to a 200 v and the secondary is connected to a floodlight that draws 5a, what is the power output? show all of your work.

What explosion in the upper solar atmosphere releases about as much energy as millions of 100-megaton hydrogen bombs exploding simultaneously?