Why are distant objects in the universe moving away from Earth? Because the light they emit is redshifted. Because Earth's gravity pushes them away Because the universe expanding Because of a supernova event

Why do remote controls for TV's use infrared waves to communicate?

How are earthquakes measured quantitatively

Why is force a vector quantity?

The jet stream flows from east to west across the United States. True False

On a very hot summer day, railroad tracks can buckle, causing train delays and derailments. Select the best reason below for the buckling.

Who was the scientist that discovered Pluto wasnt a planet

Astronauts appear weightless while working in the International Space Station because A) they are in a state of free fall. B) there isn't any gravity in outer space. C) they have very little mass when in outer space.

The distance between two consecutive crests is 2.5 meters. Which characteristics of the wave does this distance represent?

Who first landed on the moon?

What factors affect the speed of a wave? Check all that apply. the amplitude of the wave the energy of the wave the temperature of the medium the type of wave the type of medium