In order for a reaction to begin, what is required?

activation energy

ionic bonding

precipitate forming

bubbling

Pat found a wooden box in his grandparents' garage. The top was nailed shut. He used a crowbar to pry off the top. What type of simple machine did Pat use?

Our boss asks you compare two sound waves and determine which has the higher frequency. Wave A has a period of 4⁄100 second and Wave B has a perio of 1⁄7 second.

Compared to the sound of a car horn, the sound of a bird chirping has

A material does not allow charges to move freely through it. Which statement is the best prediction about this material?

Which type of current is produced by a wire breaking magnetic field lines and changing the polarity?

A diver on a diving board is undergoing simple harmonic motion. Her mass is 55.0 kg and the period of her motion is 0.800 s. The next diver is a male whose period of simple harmonic oscillation is 1.05 s.

Who was the last person to step on the moon?

The term wireless describe telecommunications in which electromagnetic waves carry a signal over a network. What describes the operation of wireless devices in a home or office using equipment connected to the Internet via specialized modems?

Why dont girls go bald

As you identify concerns about child development, you'll use assessment to A. evaluate whether a child has a special need or disability. B.