If a piece of wood is suspected to be several thousand years old, its true age can likely be determined through use of the isotope _________
Fill in the blank(s) with correct word
carbon-14
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A 4.0 kg mass has a velocity of 12 m/s to the WEST. The 4.0 kg mass undergoes an acceleration of 2.0 
to the WEST for 3.0 sec. What is the velocity of the 4.0 kg mass at the end of the 3.0 sec interval?
A. 18 m/s to the WEST B. 6.0 m/s to the WEST C. 0.0 m/s D. 6.0 m/s to the EAST E. 18 m/s to the EAST
The cosmic microwave background gives us a view of the universe when it was
A) 380,000 years old. B) 14 billion years old. C) about 1 million years old. D) 3-5 minutes old.
An ideal gas is held in a container of volume V at pressure P. The rms speed of a gas molecule under these conditions is v. If now the volume and pressure are changed to 2V and 2P, the rms speed of a molecule will be
A) 1/2 v B) v C) 2v D) 4v E) v/4
The asteroid that killed the dinosaurs exploded because
A. it was made of explosive material B. it was made out of U-235 C. it got very hot from the impact D. It didn't explode; it knocked the Earth out of its normal orbit.