What is the quality of a substance that hinders the flow of electrons through it; the ratio of the voltage to the electric current?

Comutator

Conductor

Insulator

Resistor

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?