The half-life of 30P is 2.50 minutes. If a sample of 30P has 
nuclei present initially, after 10.0 minutes how many remain?
a. 
b. 
c. 
d. 
e. 
d.
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The meteorites that strike Earth are:
A) pieces of comets that fall to Earth. B) mostly made of iron. C) the oldest rocks known. D) the remains of the planet between Mars and Jupiter. E) material from outside our solar system.
_____________ is a very long and deep canyon on Mars
a. Valles Marineris b. Ishtar Terra c. Tharsis Bulge d. Lobate Scarp e. Phobos
Metamorphic rock that is weathered and broken down into small pieces can become
A) igneous rock. B) recrystallized. C) sediments which can then become sedimentary rock. D) fossilized.
A charged particle of enters a region of magnetic field at a speed of 
at an angle of 37 degrees relative to the magnetic field direction. If the magnetic field strength is 1.2 T and the charge of the particle is +e, and the radius of the helical path is 8.9 cm, what is the particle’s mass?
a. 
b. 
c. insufficient information given.
d. 