What must exist for electric charges to flow?

electric potential or electric potential difference

What do we call seismic waves that are transmitted along the outside of earth?

Which equation is used to determine the density of a substance A - D = M/V B - D = M x V C - D = V/M D - D = MV2

Whats the excreation of living organsims

The magnetic field around a long, straight wire is: 1. concentric with the wire 2. parallel to the wire 3. radial to wire 4. tangential to the wire

Why does a box on the seat of a car slide around on the c one the car speeds up slows down or turns a corner?

Which of the following lists contains only examples of renewable sources of energy? A. wind, tidal, geothermal, and hydroelectric B. coal, solar, wind, and biomass C. fossil fuels and nuclear energy D. hydroelectric, petroleum, solar, and wind

The part of a longitudinal wave that is least dense is called a (n) rarefaction refraction contraction compression

if 100 grams is equal to 1 newton of force, and the water displaced by an object would have a mass of 40 grams, what is its buoyant force on that object?

A charge if 2 nC is placed 10cm to the right of a conducting sphere with a diameter of 2 cm. A charge of 5 nC is placed 10 nC to the left of the same sphere. determine the charge at the center of the sphere.

1) How is chemical energy transformed into potential energy?