In Huygens's construction, all points on a wave front:
a. act as point sources for the production of secondary spherical waves.
b. act as particles.
c. demonstrate the dual nature of light.
d. must be sources of plane waves.
a
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An incompressible fluid is flowing through a horizontal pipe with a constriction. The velocity of the fluid in the wide section of the pipe is 4.00 m/s and the velocity of the fluid in the narrow section of pipe is 9.00 m/s. The pressure of the fluid in the wide section is 250 kPa. What is the pressure in the narrow section of the pipe? (density of the fluid is 1000 
A. 218 kPa B. 225 kPa C. 237 kPa D. 246 kPa E. 252 kPa
A wire carrying a 2-A current is placed at an angle of 60° with the respect to a magnetic field of strength 0.2 T. If the length of the wire is 0.6 m what is the magnitude of the magnetic force acting on the wire?
A) 0.4 N B) 0.2 N C) 0.6 N D) 0.8 N E) 1.0 N
What eventually halts the gravitational collapse of an interstellar gas cloud that forms a brown dwarf rather than a true (main-sequence) star?
A) The central object becoming hot enough to sustain nuclear fusion in its core B) Degeneracy pressure caused by the high density of electrons in the core C) Thermal pressure from the high core temperature D) The onset of convection in the object's outer layers
What are the most common hydrogen compounds in the atmospheres of the jovian planets?
a. water (H2O), methane (CH4), ammonia (NH3) b. water and carbon dioxide (CO2) c. water and carbon monoxide (CO) d. sulfur dioxide (SO2) and propane (C3H8) e. none of the above