An alternating current consists of charges that: a.) turn on and off repeatedly. b.) move back and forth in a circuit. c.) flow in one direction only. d.) flow in one direction in some devices and change direction in others.

Which nonmetal makes up diamond, graphite, and the majority of coal? A - Oxygen B - Sodium C - Magnesium D - Carbon

An electromagnetic wave traveling in a vacuum has a frequency of 5 x 10 Hz, Calculate the wavelength of this wave. The speed of light in a vacuum is c. a) 6,000,000m b) om c) 0.06m d) 0.6m

Inside a star the force of gravity is balanced by

A construction worker uses an electrical device to attract fallen nails and sharp objects from a construction site. What is causing the attraction of the metal objects? A) An electrical wave oscillating perpendicular to the electrical device.

What is a free body diagram? A). A diagram of an object that is free to roll. B). A diagram showing all the forces acting on an object but not it's surroundings. C). A drawing of an object in free fall. D).

Under what condition (s) will an object be in equilibrium? Notice that equilibrium in physics has a broader definition. (A) Only if it is moving with constant velocity. (B) Only if it is at rest.

If a pressure gauge measure an increase in 3*10^ (5) Pa on an area of 0.7 m^2, calculate the increase in the force applied to the area?

Which of the following is an example of potential rather than kinetic energy? a. water rushing over Niagara Falls b. a molecule of glucose c. a crawling beetle foraging for food d. light flashes emitted by a firefly

If a force of 15 newtons [N] is applied to a surface and the pressure is measured as 4,000 pascals [Pa], what is the area of the surface in units of square milimeters [mm2 ]?

An engineer has the task of producing an aluminum alloy with a density of 3.0 grams per cubic centimeter. She comes up with the perfect alloy and saves a sample of it. Which mass and volume measurements correspond to this sample? 7 g and 2.