Which of the following statements is true of the spectral sequence?
A) It is classified in groups labeled A through Q.
B) M stars are cooler and fainter than L dwarfs.
C) Y dwarfs are a class of objects with temperatures above 500 K.
D) O stars are the hottest, and M stars are the coolest.
D
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About how far is the Oort cloud from the Sun?
a. 3 to 5 AU b. 45 to 60 AU c. 100 to 1000 AU d. 10,000 to 100,000 AU e. 4.6 billion AU
Phase Angles: A 10-? resistor is in series with a 100-?F capacitor at 120 Hz. What is the phase angle?
A. -82° B. -53° C. -37° D. -4.7° E. +37°
A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the building, assuming negligible air resistance?
A) 20 m B) 30 m C) 50 m D) 70 m
Determine the drag force acting per unit length in a 1 in diameter steel cable when air at 60ºF, 14.7 psia moves trasnversely (perpendicularly) across the cable at 30 mph.
