What is the best description of Hanny's Voorwerp?
a. spiral galaxies with unusually luminous nuclei
b. elliptical galaxies with very broad emission lines
c. a type of double-exhaust model
d. extremely luminous objects with high redshifts
e. glowing green gases due to excitation from energy from an active core
e
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Fluid flows at 2.0 m/s through a pipe of diameter 3.0 cm. What is the volume flow rate of the fluid?
A) 1.4 × 10-3 m3/s B) 5.7 × 10-3 m3/s C) 14 m3/s D) 57 m3/s
In a metal that is not a superconductor, as the temperature increases which of the following is true?
(a) Free electrons are scattered more frequently by structural defects. (b) Free electrons are scattered more frequently thermal vibrations. (c) Free-electron drift velocity is increased because of scattering by vibrating atoms. (d) Free-electron drift velocity is a constant.
A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What total distance does this proton travel during a 1.0-s time interval? (m = 1.67 × 10?27 kg, q = 1.6 × 10?19 C)
A. 82 km B. 59 km C. 71 km D. 48 km E. 7.5 km
Internal energy is a state function
Indicate whether the statement is true or false