What is required for electricity flow

What two properties does all matter share?

Is a frame of reference usually moving

What is the difference between analog and digital sound transmission?

Two cars (with masses 2000 kg and 1000 kg) collide head on an icy road. Before the collision, the more massive vehicle was moving at 10 m/s to the right and the less massive vehicle was moving at 15 m/s to the left.

While you are standing next to a fire, your body begins to heat up. This is heat transfer by? Conduction Convection Aeration Radiation

Which have more kinetic energy a 100g ball, a 200g ball, or a 500g ball explain

An internal combustion engine uses fuel, of energy content 44.4 MJ/kg, at a rate of 5 kg/h. If the efficiency is 28%, determine the power output and the rate of heat rejection.

Fleas often live on dogs or cats and bite them for meal of blood. This can be harmful to the cat or dog that is bitten. What type of symbiotic relationship is that?

Who was the scientist that discovered Pluto wasnt a planet

Astronauts appear weightless while working in the International Space Station because A) they are in a state of free fall. B) there isn't any gravity in outer space. C) they have very little mass when in outer space.