"Zulu" is the designation for ______________ time
Fill in the blank(s) with correct word
Greenwich Mean
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White-dwarf supernovae are good standard candles for distance measurements for all the following reasons except which?
A) All white-dwarf supernovae involve the explosion of stars of nearly the same mass. B) White-dwarf supernovae are so bright that they can be detected even in very distant galaxies. C) White-dwarf supernovae are common enough that we detect several every year. D) White-dwarf supernovae occur only among young and extremely bright stars. E) All white-dwarf supernovae have similar light curves, which makes them easy to distinguish from massive-star supernovae.
A car travels around a curve with constant speed. The correct statement from the following is
A. the car has zero acceleration. B. the car has an acceleration directed in the instantaneous direction of the velocity vector. C. the velocity of the car is constant. D. the car has an acceleration directed inward toward the center of the curve. E. the car has an acceleration directed outward from the center of the curve.
As an electromagnetic wave travels through free space, its speed can be increased by:
a. increasing its frequency. b. increasing its energy only. c. increasing both its energy and momentum. d. None of the above will increase its speed.
A race car traveling at 100 m/s enters an unbanked turn of 400 m radius. The coefficient of (static) friction between the tires and the track is 1.1 . The track has both an inner and an outer wall. Which statement is correct?
a. The race car will crash into the outer wall. b. The race car will crash into the inner wall. c. The car will stay in the center of the track. d. The car will stay in the center of the track if the driver speeds up. e. The car would stay in the center of the track if the radius were reduced to 200 m.