Select all the correct answers. Copper is listed in the 29th position in the periodic table. It’s used for conducting electricity. What is copper?
a metal
a metalloid
a nonmetal
a noble gas
an element

What does si stand for,when referring to a system of measurement

This is the number of complete movements of a wave per second.

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.