If a toy car with a coin on top of it is rolling down a hill what force is keeping the coin on top of the car?

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

Which object is most likely represented by a dot?

An electromagnet is a device in which moving electric chargers in a coil of wire create a magnet. whats one advantage of using electromagnetic in devices