1) Archeologists have found fossil remains of some of the first land animals in layer C. It has been suggested that C-14 be used to data the
fossils. Some archeologists have objected and suggested that it would
be best to use U-238 or Pb-206 to date the rock layer instead. Why
would they make such a suggestion?
A)
Rocks do not contain any elemental carbon for
radiometric dating purposes.
B)
Carbon-14 is only found in living things; it can only
be used to date remains.
C-14 has a very short half-life, 5700 years, and based
C) on geologic history, layer C may be several million
years old.
C-14 has such a long half-Life, 570000 million years,
D) it would be more appropriate to use a radioactive
element with a shorter half-life.

For a particular reaction, ? h = -144.6 kj and ? s = -301.2 j/k. calculate ? g for this reaction at 298 k.

If a textbook weighs 37.2 n on venus, and the book has a mass of 4.4 kg, what is the strength of gravity on venus? 8.9 m/s28.9 m/si don't have enough information,9.8 m/s2

An alligator swims to the left with a constant velocity of 5 \,\dfrac{\text{m}}{\text s}5 s m ? 5, space, start fraction, m, divided by, s, end fraction. when the alligator sees a bird straight ahead, the alligator speeds up with a constant acceleration of 3 \,\dfrac{\text {m}}{\text s^2}3 s 2 m ? 3, space, start fraction, m, divided by, s, start superscript, 2, end superscript, end fraction leftward until it reaches a final velocity of 35 \,\dfrac{\text {m}}{\text s}35 s m ? 35, space, start fraction, m, divided by, s, end fraction leftward. how many seconds does it take the alligator to speed up from 5 \,\dfrac{\text {m}}{\text s}5 s m ? 5, space, start fraction, m, divided by, s, end fraction to 35 \,\dfrac{\text {m}}{\text s}35 s m ? 35, space, start fraction, m, divided by, s, end fraction?