Which of the following is a statement of the Big Bang? a. Debris from other galaxies was used to form ours.
b. Millions of stars collided and sent material out into the universe.
c. There was a great expansion of space.
d. It was an explosion similar to a hydrogen bomb.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

What is a carrier wave and how does it affect what you hear on the radio

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.