Sound waves tend to move in?

What is required for an electric charge to flow through a wire? a) zero resistance in the wire b) a balance of electric potential c) high resistance in the wire d) a difference in electric potential

In an exothermic reaction, the amount of energy required to break the attractions among the solute particles and among the solvent particles is A) greater than the energy released as attractions form between solute and solvent particles.

Nuclear energy is more harmful to the environment than a coal-fired power plant because it produces more mercury, air pollution, and carbon dioxide. True False

As the ambulance got closer, Marge noticed that the pitch of the siren got higher. This happened because A) the sound waves were pushed closer together. B) the human ear increases pitch over time. C) the ambulance was further away.

What is it that lives if it is fed, and dies if you give it a drink? (This should be really easy)

Which represents a system that is almost completely closed?

If many household substances classify as acids or bases what is the ph scale

A protostar forms once the nebular cloud condenses and the core begins

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?