The alveoli in the lungs have very thin surface membranes which are often made out of a single layer of cells. the alveoli in the lungs are used by the body for the exchange of
a.
nutrients
b.
liquids
c.
energy
d.
gases

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

If the speed of a particle triples ,by what factor does its kinetic energy increase?

What is the rate of change in a objects position?