Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

an ideal gas system undergoes an adiabatic process in which it expands and does 20 J of work on its environment. how much energy is transferred into the system as heat

A model airplane exerts 0.45 newton's over a distance of 250 meters. How much work was the plane doing?

Which of the following states of matter has a definite volume? A. liquids only B. solids only C. liquids and gases only D. solids and liquids only

Three cars, car X, car Y, and car Z, begin accelerating from rest, at the same time. Car X is more massive than car Y, which is more massive than car Z. The net force exerted on each car is identical. 1.

If a 747 contains 155,211 l of fuel, what is the mass of the fuel in kilograms? assume the density of the fuel to be 0.768 g/cm3.

Which of the following lists contains only examples of renewable sources of energy? A. wind, tidal, geothermal, and hydroelectric B. coal, solar, wind, and biomass C. fossil fuels and nuclear energy D. hydroelectric, petroleum, solar, and wind

How do particles of gases affect one another's motion

explain the sequence of events that happens when this fluid cools down. be sure to focus on what happen to the molecules and to the fluid in general. five event should be included in your answer

Which group of hominids lived at the same time as Homo sapiens? a. australopithecines c. Homo habilis b. Homo erectus d. Neandertals

Which statements describe properties of stars check all that apply