a vehicle travels north 200mi, then south 155, then North 25.0mi in 40 hr. what is the magnitude for it's average velocity

What are the theoretical properties of a gas at a temperature of 0 kelvin?

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

Explain why electric current cannot exist if a current doesn't have a voltage source.