Fossils that are useful in correlating rock layers are called
a. index fossils.
b. trace fossils.
c. range fossils.
d. tracing fossils.
a
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A 2.0-kg block slides on a frictionless 15° inclined plane. A force acting parallel to the incline is applied to the block. The acceleration of the block is 1.5 m/s2 down the incline. What is the applied force?
a. 8.1 N down the incline b. 3.0 N down the incline c. 2.1 N up the incline d. 3.0 N up the incline e. 8.1 N up the incline
A beetle runs an erratic pattern on a square kitchen table that is 1.5 m on a side. The sides are arranged along the directions North/South and East/West. If he begins at the Southwest corner, and travels along one side to the adjacent corner in 20.0 s. He then turns north, and reaches the Northeast corner 12.5 s later. What is the magnitude of his average velocity for the whole trip?
A. 0.092 m/s B. 0.098 m/s C. 0.065 m/s D. 0.033 m/s
In addition to Saturn's Titan, which other moon has a nitrogen atmosphere?
A) Jupiter's Europa B) Uranus' Titania C) Neptune's Triton D) Jupiter's Ganymede E) Pluto's Charon
You start with a sample of 14C that contains 200 atoms. After three half-lives, how many atoms of 14C will be left?
A. 25 B. 50 C. 75 D. 100 E. 150