What generates the magnetic field that surrounds a wire carrying an electric current? 1)motion of protons in the wire.
2)motion of electrons in the wire.
3)electrostatic field in the atmosphere
4)motion of charged particles in the insulation

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?