What is a "hertz" in physics?

How do birds manage to fly without flapping their wings?

Can you convert 80 mg to kg

TRUE or FALSE: All electromagnetic radiation can travel through empty space, and travels at the same speed.

Which statement is an observation from Newton's experiments with light? White light becomes a range of colors after passing through a prism. A prism adds a range of colors to white light. Newton asked questions about the makeup of white light.

All matter is composed of atoms, which are, in turn, composed mostly of empty space. why is it not possible to walk through a wall or to put your hand right through your desk?

T/F all compounds are molecules but NOT all molecules are compounds.

particle is projected from the surface of the planet Krypton with a speed equal to 3.6 times the escape speed from that planet's surface.

Does the box contain positive charge, negative charge, or no charge? Does the box contain positive charge, negative charge, or no charge?

How does acceleration affect speed and velocity

What will not result in acceleration