When we say the universe is expanding, we mean that:a. Everything in the universe is growing in size. b. The average distance between galaxies is growing with time. c. The universe is getting older.

A barium atom loses two electrons what charge does it have

Which of the following statements about measuring water flow is true? A. The measurement is determined by using quantity measurements only B. The measurement is determined by multiplying quantity and time C.

A boy on a bicycle rides at 21.1 m/s a distance of 87.9 m. How long does it take?

An element can be identified by its spectrum

When a shade is pulled over a clear window, it blocks all the light from passing through. Before the shade was pulled down, the window was. With the shade down, the window and shade together are.

A child on a sled starts from rest at the top of a 15° slope. if the trip to the bottom takes 23.9 s how long is the slope? assume that frictional forces may be neglected.

Which si prefix means one one-hundredth (1/100) ?

A sled is being pulled to the left by 5 dogs with 6 newtons of force. Find the net force

Objects become electrically charged as a result of the transfer of

How many electrons do most atoms seek to have on their valence shell? Using this information, explain why certain elements are unreactive and why other elements are reactive.