Platinum (Pt) is in the 78th position in the periodic table. A neutral atom of the element that comes just before platinum in the periodic table has (Blank) electrons and (Blank) protons.

Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15

Avolcano erupts next to a grassland area in a valley. a. describe three ways in which material released by the volcano could impact the grassland area. b. describe three ways in which the grassland ecosystem could recover after a volcanic eruption.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?