How is an electromagnet formed ?

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

The two required components for a generator

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.