When viewed from nearby, a black hole in empty space _____
a. has a funnel shape, extending to the event horizon
b. glows in X-rays and gamma-rays from superheated surface
c. is invisible
d. would look like a dark sphere the size of Earth
e. emits blackbody radiation only
c
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Shepherd satellites are defined as
A) satellites in the coma of a comet. B) moons that confine a narrow ring. C) a type of moon that orbits another moon. D) moons that follow the exact orbit of another, larger, moon. E) moons that orbit inside the system of rings.
To avoid toxic vapor, one can use a(n) ____________ barometer to measure pressure
a. mercury b. Galileo c. aneroid d. Torricelli
How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1 000 W/m2?
a. 3.3 × 10^-6 J b. 3.3 J c. 0.003 J d. 10-4 J e. 3.0 × 10^5 J
A thin, circular disk of radius R = 30 cm is oriented in the yz-plane with its center as the origin. The disk carries a total charge Q = +3 ?C distributed uniformly over its surface
Calculate the magnitude of the electric field due to the disk at the point x = 15 cm along the x-axis. A) 9.95 × 105 N/C B) 4.98 × 105 N/C C) 3.32 × 105 N/C D) 2.49 × 105 N/C E) 1.99 × 105 N/C