What happened to the compass deflection when the resistor was removed? what does this tell you about the current in the circuit?

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

For this car, predict the shape of a graph that shows distance (x) versus time (t). note that time is the independent variable and will be on the bottom axis. need asap

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.