As a body falls through air starting from rest, its velocity
a. stays constant
b. continuously decreases
c. continuously increases
d. gets larger and larger, eventually reaching a constant value
e. gets smaller and smaller, eventually approaching zero
Question 2
What is one difference between a rad and a rem?
a. A rad measures an amount of radiation and a rem measures a biological effect.
b. A rad measures a biological effect and a rem measures an amount of radiation.
c. Rem is an older term for rad.
d. One rem equals 100 rads.
e. One rad equals 100 rems.
Gas exchange across body surfaces.
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