An object moves with constant speed through a fluid. For a fixed geometry and fluid density, if the viscosity of the fluid increases then the speed at which flow becomes turbulent
A)
increases.
B)
remains the same.
C)
decreases.
D)
could increase or decrease depending on the shape of the object.
E)
could increase or decrease depending on the value of the fluid density.
A
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A reversible engine is one that
A. generates no net heat. B. does no net work. C. acts as a refrigerator. D. causes no increase in net entropy.
A bird can safely land on a bare high voltage power line because
A. If both feet are touching the bare wire, they are at the same potential – and therefore no current can flow between the feet and through the bird’s body B. Its internal resistance is very high, so very little current will flow C. The line cannot deliver enough current to harm it D. Its feet are good insulators, and therefore it is protected
Photoelectric Effect: Light of a given wavelength is used to illuminate the surface of a metal, however, no photoelectrons are emitted. In order to cause electrons to be ejected from the surface of this metal you should
A. use light of a longer wavelength. B. use light of a shorter wavelength. C. use light of the same wavelength but increase its intensity. D. use light of the same wavelength but decrease its intensity.
the magnetic field in the primed frame.
A. A B. B C. C D. D E. Toward the viewer F. Away from the viewer T. There is no field of this type.