Which of the following describes an element

matter made up of only one type of atom
a substance made of two or more types of atoms
two or more types of atoms chemically bonded together
two or more types of atoms that are not chemically bonded
question 3(multiple choice worth 2 points)

What is the magnitude of the resultant vector round your answer to the nearest tenth

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

Una carga puntual de 3 x 10-6 c se coloca a 12 cm de una segunda carga puntual de - 1,5 x 10-6 c. calcular la magnitud fuerza eléctrica entre las cargas