Knowledge of atomic structure has evolved over time. thomson discovered that atoms contain electrons, rutherford discovered that most of the mass of an atom is concentrated in its center, and bohr discovered that electrons orbit the nucleus. taken together, what do these discoveries demonstrate

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

The temperature at a point (x, y) is t(x, y), measured in degrees celsius. a bug crawls so that its position after t seconds is given by x = 6 + t , y = 8 + 1 3 t, where x and y are measured in centimeters. the temperature function satisfies tx(3, 9) = 5 and ty(3, 9) = 4. how fast is the temperature rising on the bug's path after 3 seconds? (round your answer to two decimal places.)

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in