What is the sum of 1.53 + 2.786 + 3.3 expressed to the correct number of significant figures?
A) 7
B) 7.6
C) 7.62
D) 7.616
E) 7.6160
B
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A total lunar eclipse is
a. visible only from the path of totality. b. visible only during a new moon. c. visible to all observers on the side of Earth from which the moon would be visible at that time. d. an opportunity to study the corona of the sun. e. none of the above
One hypothesis suggested to explain the uniform age of the surface of Venus is that
a. Venus's surface is 4 billion years old and has not been affected by flooding or slow evolution. b. Venus's surface is made of rocks that are much harder than Earth's and thus last longer. c. Venus periodically goes through a catastrophic melting of its entire surface. d. Venus's clouds protect it from meteorites so that very few impacts occur to change its surface. e. dust storms deposit large amount of dust on the surface, making it appear of uniform age.
Optics of the Eye: The closest object that a typical young person with normal vision can focus on clearly is closest to
A. 1 cm. B. 10 cm. C. 25 cm. D. 50 cm. E. 75 cm.
The electric field of a point charge has an inverse ________ behavior
a. r1/2 b. r c. r2 d. r3