A 200-m radio telescope is used to investigate sources emitting a 21-cm wavelength. The minimum angular separation resolvable for this system is
A)
0.073°.
B)
0.03°.
C)
0.0013°.
D)
0.154°.
E)
0.0026°.
A
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A 66-kg woman runs up a flight of stairs having a rise of 4.0 m in a time of 4.2 s. What average power did she supply?
a. 380 W c. 620 W b. 560 W d. 670 W
Greenhouse gases are opaque to _____
A) infrared radiation B) visible light C) ultraviolet radiation D) microwaves
Addition by 1. Components: Vector 
has a magnitude of 6.0 m and points 30° east of south. Vector 
has a magnitude of 4.0 m and points 30° west of north. The resultant vector 
+ 
is given by
A. 2.0 m at an angle of 30° north of west. B. 2.0 m at an angle of 30° east of south. C. 10.0 m at an angle of 60° north of west. D. 10.0 m at an angle of 60° east of south. E. 1.0 m at an angle of 60° north of west.
Which planets have densities similar to that of Earth's?
A. Uranus and Neptune B. Mars and Mercury C. Pluto and Charon D. Jupiter and Saturn