Explain the concept of "charge" and how it relates to electricity?

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

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Why do astronauts in the space shuttle weigh less?