A waxing crescent Moon is visible
a. near the eastern horizon just before sunrise.
b. near the eastern horizon just after sunset.
c. near the western horizon just before sunrise.
d. near the western horizon just after sunset.
e. from sunset until sunrise.
d
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A spherical conductor (radius = 1.0 cm) with a charge of 2.0 pC is within a concentric hollow spherical conductor (inner radius = 3.0 cm, outer radius = 4.0 cm) which has a total charge of ?3.0 pC. What is the magnitude of the electric field 2.0 cm from the center of these conductors?
a. 23 N/C b. zero c. 45 N/C d. 90 N/C e. 110 N/C
A permanent magnet is produced when
A. electrical fields exchange electrons with the magnetic fields. B. electrons become stuck and cease to move. C. current is made to circulate in a clockwise direction in a loop of wire. D. magnetic fields of large groups of individual atoms are permanently aligned.
Which is the formula for baking soda?
a. NaHCO3 b. NaOH c. (NH4)2 SO4 d. HC2H3O2
A magnifying glass has a convex lens of focal length 15 cm. At what distance from a postage stamp should you hold this lens to get a magnification of +2.0?