Which of the following items would not be considered "dark matter" by astronomers?
A) basketballs
B) black holes
C) weakly interacting massive particles
D) red giants
E) people
D
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A gas is placed in a thermally insulated container as shown below
As the piston is slowly lowered, the applied force F...
What happens to energy in the Sun's convection zone?
A) Energy is produced in the convection zone by thermal radiation. B) Energy is transported outward by the rising of hot plasma and sinking of cooler plasma. C) Energy slowly leaks outward through the radiative diffusion of photons that repeatedly bounce off ions and electrons. D) Energy is produced in the convection zone by nuclear fusion.
The two types of bright nebulae are emission nebulae and _______________ nebulae
a. photonic b. absorption c. refraction d. reflection
A non-conducting sphere of radius R = 7 cm carries a charge Q = 4 mC distributed uniformly throughout its volume
At what distance, measured from the center of the sphere does the electric field reach a value equal to half its maximum value? A) 3.5 cm only B) 4.9 cm only C) 3.5 cm and 9.9 cm D) 3.5 cm and 4.9 cm E) 9.9 cm only