At New York City, the earth's magnetic field has a vertical component of that points downward (perpendicular to the ground) and a horizontal component of that points toward geographic north (parallel to the ground). What are the magnitude and direction of the magnetic force on a 6.0-m long, straight wire that carries a current of perpendicularly into the ground?

At New York City, the earth’s magnetic field has a vertical component of that points downward (perpendicular to the ground) and a horizontal component of that points toward geographic north (parallel to the ground). What are the magnitude and direction of the magnetic force on a 6.0-m long, straight wire that carries a current of perpendicularly into the ground?
A 15.0 ohm resistor is connected in series to a 120 volt generator and two 10.0 ohm resistors that are connected in parallel to each other.
a. What is the total resistance of the load?
b. What is the magnitude of the circuit current?
c. What is the current in one of the 10.0 ohm resistors?
d. What is the potential difference across the 15.0 resistor?
A railroad Diesel engine weighs 4 times as much as a freight car. If the Diesel engine coasts at a 5 km/h into a freight car that is at rest show that the speed of the coupled car is 4 km/h.