A sample of water, H2O, has a mass of 38.0 g. How many atoms of oxygen are in the sample? (oxygen has 16.0 g/mol, hydrogen has 1.00 g/mol, and NA = 6.02 × 10^23)
a. 3.34 × 10^22
b. 5.35 × 10^23
c. 1.27 × 10^24
d. 2.29 × 10^25
c
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Which of the following is not produced by plate tectonics?
a. midocean rifts b. rift valleys c. the ring of fire d. the Appalachian Mountains e. Earth's magnetic field
Newton's Second Law in 2 Dimensions: A 50.0-kg crate is being pulled along a horizontal smooth surface. The pulling force is 10.0 N and is directed 20.0° above the horizontal. What is the magnitude of the acceleration of the crate?
A. 0.0684 m/s2 B. 0.188 m/s2 C. 0.200 m/s2 D. 0.376 m/s2 E. 0.0728 m/s2
Which of the following is(are) found mainly between Mars and Jupiter?
a. Asteroids b. Meteoroids c. Comets d. Interplanetary dust
Which of the following are not a common depositional feature of shoreline topography?
a. Barrier islands b. Pocket beaches c. Sea arches d. Spits