Scientists suggest that the universe is still expanding. Which statement supports the claim made by the scientists? The universe is 13.7 billion years old.
The galaxies in the universe are composed of dark matter.
The universe originated from a hot, dense point.
The galaxies in the universe are moving away from Earth at high speeds.

Which of the following represents an upside-down image?

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.