According to the following reaction, which molecule is acting as a base?
H2O + NH3 ? OH- + NH4+
A) H2O
B) NH3
C) OH-
D) NH4+
E) none of the above
Answer: B
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Venus and Earth probably formed with similar amounts of carbon dioxide in their secondary atmospheres. Which of the following is true?
a. The majority of Earth's carbon dioxide escaped into space because of its hotter temperature, whereas Venus's carbon dioxide remains gravitationally bound to Venus. b. The majority of Earth's carbon is now bound up in rock, whereas Venus's remains in its atmosphere. c. Earth lost more of its secondary atmosphere because it was bombarded by more planetesimals than Venus. d. The majority of Earth's carbon was absorbed by plants during photosynthesis. e. Earth and Venus still have equal amounts of carbon dioxide in their atmospheres.
X-ray bursters occur in binary star systems. The two types of stars that must be present to make up such an object are:
A) a white dwarf and a neutron star. B) a contact binary system of two red giants. C) a white dwarf and a main sequence star. D) a main sequence or giant star and a neutron star in a mass transfer binary. E) two neutron stars in a mass transfer binary.
Motional Emf: As shown in the figure, a straight wire carries a steady current I. A metal bar is in contact with a pair of rails and is in upward motion with velocity of magnitude ?. The polarity of the induced emf in terminals X and Y is
A. X and Y are at the same potential. B. X is positive and Y is negative. C. Y is positive and X is negative.
_________ stresses are stresses in a material that are not caused by an external applied force.
Fill in the blank(s) with the appropriate word(s).