Why is the sunspot cycle carefully monitored from earth?

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.

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.