Two point charges, separated by 15 cm, have charge values of +2.0 µC and -4.0 µC, respectively. What is the value of the mutual force between them? (ke = 8.99 × 10^9 N×m2/C2)
a. 8.0 × 10^-12 N
c. 320 N
b. 3.6 × 10^-8 N
d. 3.2 N
D
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A beam of light traveling in air strikes a glass slab at an angle of incidence less than 90°. After entering the glass slab, what does the beam of light do? (There could be more than one correct choice.)
A) I follows the same path as before it struck the glass. B) It follows the normal to the glass slab. C) It bends away from the normal at the point of contact. D) It bends closer to the normal at the point of contact. E) It slows down.
If the density of the universe is at the critical density, then the geometry of the universe would follow ordinary Euclidean geometry
Indicate whether the statement is true or false
Evidence for very recent water erosion on Mars comes from the observations of
A) dark streaks on crater walls B) channels carved on the slopes of volcanoes C) dried up river beds on the highlands D) mud flows surrounding craters
The formula for iron(II) sulfate is
a. Fe2SO4. b. Fe2(SO4)2. c. Fe(SO4)2. d. FeSO4.