In an electric circuit it must be what or there will be no flow of electricity?

Calculate the total force on the Earth due to Venus, Jupiter, and Saturn, assuming all four planets are in a line. The masses are Mv=0.815ME, MJ=318ME, Msat=95.1ME, Msun=1.99x10^30kg, ME=5.

Which is an example of Earth's conditions slowly changing? a. meteors striking c. continents moving b. volcanoes erupting d. a mass extinction

A pan of liquid water freezes when you place it outside on a cold day. Liquid water has greater molecular disorder than ice does. Is the freezing process, then, an exception to the law of entropy?

Which reaction fuels the burning of the sun

What is meant by the phrase "color by subtraction of light?"

A closed, nonconducting, horizontal cylinder is fitted with a nonconducting, frictionless. floating piston which divides the cylinder into Sections A and B. The two sections contain equal masses of air, initially at the same conditions.

Which of the following is the best definition of refraction? A. reversal in the direction of a wave B. loss of energy from a wave C. change in wave direction due to a change in wave speed D. blocking of a wave by a sharp boundary

What is not a living part of an ecosystem? fungus, sun, tree or fly?

If you try to move the magnets closer together what will you most likely feel

The 20 g bullet is traveling at 400 m/s when it becomes embedded in the 2 - kg stationary block. Determine the distance the block will slide before it stops. The coefficient of kinetic friction between the block and the plane is μk=0.2.