Electricity from fusion nuclear energy a. is not possible. b. accounts for less than 15 percent of current world electricity production. c. has been achieved, but is not yet practical. d. has been increasing for the past seventy years.

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference

Which of these is not a possible type of energy transformation? a. electrical energy into light energy b. sound energy into nuclear energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy