For a scientific hypothesis to be valid, there must be a test for proving it  

The unit of electrical resistance is the  

Ohm’s law tells us that the amount of current produced in a circuit is  

A 2-kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. The recoil velocity of the rifle is about (use conservation of momentum)  

As more lightbulbs are connected in a parallel circuit the resistance decreases and the overall current in the circuit  

If you can’t avoid being hit by a fast-moving object, you’ll suffer a smaller contact force if you can extend that force over a  

It is said that electric charge is conserved, which means that electric charge  

A ball rolls off the edge of a table at the same time another ball drops vertically from the same table. The ball to hit the floor first is the  

The approximate range of human hearing is  

When current reverses direction in a wire, the surrounding magnetic field