A force of 200 N toward north is exerted on an object with a mass of 40.0 kilograms. What is the acceleration?

How is the composition of a meteorite relevant to finding out the composition of earth's core?

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

How are isotopes of the same chemical element alike? how are they different?