Earth's continental crust ranges in thickness from about
a. 98 to 140 km.
b. 19 to 40 km.
c. 5 to 26 km.
d. 8 to 16 km.
b
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Indicate whether the statement is true or false
Wall posters are usually sold curled up in cylindrical cardboard tubes. If the length of the tube is 84.5 cm, and the inside diameter of the tube is 2
40 cm, what is the area of the poster expressed to the correct number of significant figures? (Assume the poster is just as long as the tube and does not overlap itself.) A) 202.8 cm2 B) 637.1 cm2 C) 203 cm2 D) 319 cm2 E) 637 cm2
What happens when a charged insulator is placed near an uncharged metallic object?
1.They repel each other. 2.They attract each other. 3.They may attract or repel each other, depending on whether the charge on the insulator is positive or negative. 4.They exert no electrostatic force on each other. 5.The charged insulator always spontaneously discharges.
When a source of sound approaches, measurements will show an increase in the sound's
1) speed, 2) frequency, 3) wavelength, 4) all of these, 5) none of these, and when a source of sound recedes, measurements will show an increase in the sound's 6) speed. 7) frequency. 8) wavelength. 9) all of these. 10) none of these.