About how many stars are visible to the naked eye on a clear, dark night away from city lights?
A) a few dozen
B) a couple thousand
C) several million
D) a few hundred billion
B) a couple thousand
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A long cylindrical conductor (radius = 1.0 mm) carries a charge density of 4.0 pC/m and is inside a coaxial, hollow, cylindrical conductor (inner radius = 3.0 mm, outer radius = 4.0 mm) that has a total charge of -8.0 pC/m. What is the magnitude of the electric field 2.0 mm from the axis of these conductors?
a. 24 N/C b. 18 N/C c. zero d. 36 N/C e. 226 N/C
If the temperature of a room is 62
then what is the temperature of the room in Kelvin?
A. 289.8 K B. 291.7 K C. 300.0 K D. 307.8 K E. 312.0 K
In the context of binary pulsars, in Hercules X-1, _____
A) matter flows from a star into an accretion disk around a dead star, producing gamma rays B) a 6-solar-mass star and a neutron star orbit each other with a period of 28.7 days C) several low-energy processes go on simultaneously D) X-rays turn off when the neutron star is eclipsed behind the normal star
About where is our solar system located within the Milky Way Galaxy?
a) about half way from the center of the galaxy to the outskirts of the galactic disk b) in the halo of the galaxy about the galactic disk c) near the far outskirts of the galactic disk