What are peculiar velocities?
A) velocities perpendicular to our line of sight
B) velocities directly along our line of sight
C) velocities that we cannot explain by only the force of gravity
D) velocities caused by the expansion of the universe
E) velocities of distant objects that are not caused by the expansion of the universe
E
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How fast is a galaxy at a distance of 300 Mpc receding from us?
A: 300 km/s B: 300,000 km/s C: 240 km/s D: 21,600 km/s E: 7,200 km/s
The primary reason that Mercury and the Moon lack atmospheres is because they are not volcanically active.
Answer the following statement true (T) or false (F)
Metals are good conductors of both heat and electricity due to
A) similar thermal and electrical conductive properties. B) looseness of outer electrons in metal atoms. C) relatively high densities of metals. D) high elasticity of metals. E) both transferring energy easily.
Camera Exposure: A 35-mm camera equipped with a 45-mm focal length lens is used to photograph a tree 15 m tall. If the aperture of the lens is set at f/2, what is the aperture diameter?
A. 23 mm B. 14 mm C. 18 mm D. 27 mm E. 31 mm