7.for the following questions, use a periodic table and your atomic calculations to find the unknown information about each isotope: you have an neutrally charged isotope with 30 electrons and a mass number of 64. what element is it? cu: copper zn: zinc p: phosphorus se: selenium

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Choose a synonym for the underlined homonym (a word with two or more meanings). i did not expect the boat to rock so much. a. boulder c. astound b. sway d. shock

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.