The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups? a. according to the type of minerals present in the rock b. according to how many times they have been through the rock cycle c. according to the method of their formation d. according to the amount of weathering they have endured rese

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.