What is an electric motor? Explain its operation.

An element's atomic number is 39. How many protons would an atom of this element have?

What is the astronaut impact on the future of the united states?

In a resonating pipe that is open at one end and closed at the other end, there is a displacement node at the closed end and a displacement antinode at the open end. are displacement antinodes at each end. are displacement nodes at each end.

Which statement about velocity is true?

What did the heliocentric and geocentric theories explain

What is the outcome of all chemical changes when two substances are combined? A new substance forms with identical properties. The two substances release an odor. The two substances change color. A new substance forms with different properties.

Your myth: Dogs and wolfs are the same species Fact: Evidence:

Friction is a force that speeds up motion between two surfaces that are in contact

Which actions are evidence that a chemical reaction has occurred? Check all that apply. A: a change in color B: the formation of a precipitate C: a clear liquid becoming cloudy D: a change in shape E: the formation of bubbles F: the formation of

Which sphere forms Earth's outermost layer? Atmosphere Biosphere Cryosphere Hydrosphere