River water flows around a circular 20-cm-diameter pier at 0.01 m/s. The flow is:

(A) Creeping flow
(B) Flow with a wake
(C) Stokes flow
(D) Low-Reynolds-number flow


Physics & Space Science

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Which condition of motion must be met with regard to a charged particle if it is in the process of emitting electromagnetic radiation?

a. moves at constant velocity b. accelerates c. moves at the speed of light d. moves parallel to a uniform magnetic field

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The sunspot cycle has a period of

a. 19 years. b. 11 years. c. 38 years. d. 24 years.

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The gas between stars that has a temperature below a few hundred kelvins is best studies with which kind of telescope?

A) Radio B) Infrared C) Optical D) Ultraviolet E) X-ray

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