How might a pulsar appear to an observer?
A) It may appear to flash several times per second or more with near perfect regularity.
B) It may slowly get dimmer and brighter with a period ranging from several days to several weeks.
C) It may appear to flash at random intervals.
D) It may appear to change color very rapidly, from blue to red and back again, with near perfect regularity.
E) Its spectrum may alternate between showing blueshifts and redshifts very rapidly with near perfect regularity.
A) It may appear to flash several times per second or more with near perfect regularity.
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A baseball is struck by a batter at an angle such that it reaches its maximum height at the location of the pitcher – and just grazes the top of the pitcher’s head (at an elevation of 1.50 m above the launch point of the baseball). The pitcher is a horizontal distance of 20.0 m from the point at which the ball was struck. What was the launch angle for the baseball?
a. 
b. 
c. 
d. 
e. 
f. 
Three identical 3.0-µC charges are placed at the vertices of an equilateral triangle that measures 30 cm on a side. What is the magnitude of the electrostatic force exerted on any one of the charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 1.6 N B) 1.8 N C) 2.0 N D) 2.2 N E) 2.4 N
How is the magnification, mo, of the objective lens in a microscope related to the focal length, fo, of the lens?
A. Amo= -1/fo B. mo= -fo/L C. mo= -L/fo D. mo= L - fo
We proved, using Einstein's two basic principles, that if Velma is moving past Mort then Mort should observe Velma's clock to go slow. This behavior of Velma's clock occurs because, as observed by Mort,
A) the light beam in her light-clock travels less than 300,000 km during one of Velma's ticks. B) the light beam in her light-clock travels further than 300,000 km during one of Velma's ticks. C) Velma's light-clock shortens along its direction of motion. D) the light beam in Velma's light-clock travels at slower than the normal lightspeed. E) the light beam in Velma's light-clock travels at faster than the normal lightspeed.