the speed of sound in the air is about 340m/s. what is the wavelength of a sound wave with a frequency of 400Hz?

An astronaut has two objects that are identical in all respects, except that one is painted black and the other is painted silver. Initially, they are at the same temperature.

When you exercise, an area of the brain called the pituitary gland releases chemicals into your bloodstream called

Coiling wire around an iron core and applying an electric current through the wire creates a temporary magnet called an electromagnet. What would increase the strength of an electromagnet? A) Use a smaller nail. B) Use a battery with less voltage.

Explain the relationship between DNA, Chromosomes and genes.

Use the terms scientific law and theory in a sentence

When a cyclist rides past you on the street, this is an example of

Why are galaxies visible

I hockey puck slides across an ice rink more easily than it does across a rough concrete surface why is this

Sodium-22 Sodium-25 # of protons # of neutrons # of electrons

As the particles of a solid undergo sublimation, they A: lose energy B: move closer to one another C: change temperature D: move farther apart from one another