What type of observation can astronomers use to measure the composition of extrasolar planet atmospheres?
A) measurements of the host star's velocity throughout an orbital cycle
B) measurement of how frequently the planet blocks the host star's light
C) comparisons of spectra when planets are in front of or are eclipsed by their host stars
D) combination of a transit observation and a Doppler shift measurement
C
You might also like to view...
What is the acceleration due to Earth's gravity at a distance of 10 Earth radii from Earth's center?
A. 10 m/s2 B. 1 m/s2 C. 0.1 m/s2 D. 0.01 m/s2
Two planets have the same surface gravity, but planet B has twice the radius of planet A. If planet A has mass m, what is the mass of planet B?
A) 4m B) m C) m/4 D) m E) m/
Viscosity: Two horizontal pipes are the same length, but pipe B has twice the diameter of pipe A. Water undergoes viscous flow in both pipes, subject to the same pressure difference across the lengths of the pipes. If the flow rate in pipe A is Q = 
, what is the flow rate in pipe B?
A. 2Q
B. 4Q
C. 8Q
D. 16Q
E. Q
A 200-N object floats with three-fourths of its volume beneath the surface of the water. What is the buoyant force exerted by the water on the object? The density of water is 1000 kg/m3
A) 50 N B) 150 N C) 200 N D) 267 N E) It cannot be determined because we do not know the volume of the object.