Alexandra knows that the atomic number of the element potassium, k, is 19. she also knows that one particular isotope of potassium has a mass number of 39. how many neutrons can be found in the nucleus of this isotope of potassium?

a) 19

b) 20

c) 39

d) 58

Atwo-stage air compressor operates at steady state, compression 10m^3/min of air from 100 kpa and 300k to 1200 kpa. an intercooler between the two stages cools the air to 300k at a constant pressure of 350 kpa. the compression processes are isentropic. a) calculate the power required to run the compressor, in kw b) compare the result to the power required for isentropic compression from the same inlet state to the same final pressure.

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

Often called simply "velocity," this is the velocity of an object at a particular moment in time.