If a source of light is approaching us at 3,000 km/sec, then all its waves are
A) redshifted by 1%.
B) not affected, as c is constant regardless of the direction of motion.
C) blueshifted out of the visible spectrum into the ultraviolet.
D) blueshifted by 1%.
E) redshifted out of the visible into the infrared.
D
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The age of a star cluster can be determined from the ____________________ of the cluster
Fill in the blank(s) with correct word
Aluminum has a shear modulus of 
and a wave velocity for shear waves of 2,981 m/s. If the velocity of shear waves decreased by 10%, then what is the change in the shear modulus?
A. 35% B. 30% C. 25% D. 20% E. 15%
A gas heated to millions of degrees would emit
A) mostly radio waves. B) mostly X-rays. C) no light, because it is too hot. D) mostly ultraviolet light. E) an equal amount of all wavelengths of light.
A 100-N uniform ladder, 8.0 m long, rests against a smooth vertical wall. The coefficient of static friction between ladder and floor is 0.30 . What minimum angle can the ladder make with the floor before it slips?
a. 22° c. 18° b. 51° d. 59°