A planet's average density is equal to its ________ divided by its ________.
A. mass; radius
B. mass; volume
C. mass; surface area
D. volume; mass
Answer: B
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The lamps in a string of decorative lights are connected in parallel across a constant-voltage power source. What happens if one lamp burns out? (Assume negligible resistance in the wires leading to the lamps.)
A) The brightness of the lamps will not change appreciably. B) The other lamps get brighter equally. C) The other lamps get brighter, but some get brighter than others. D) The other lamps get dimmer equally. E) The other lamps get dimmer, but some get dimmer than others.
How have scientists mapped the surface features of Venus?
a. data received from rovers on the surface b. data received from multiple probes sent to the surface c. observations made from the Hubble Space Telescope d. radar imaging by the Magellan spacecraft e. UV imaging by the Odyssey spacecraft
Air can be compressed easily because there is a great deal of empty space between air molecules
Indicate whether the statement is true or false
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 4.0 cm from the center of the two surfaces?
a. 3.8 N/C b. 4.1 N/C c. 3.5 N/C d. 3.2 N/C e. 0.28 N/C