The vertical columns of elements in the periodic table are called
a. periods.
b. groups.
c. families.
d. series.
b
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In which area of the galaxy would you find stars with fairly circular orbits about the galactic center?
a. central bulge b. halo c. corona d. disk e. galactic center
Relative Velocity: A plane flies directly from city A to city B, which are separated by 2300 mi. From A to B, the plane flies into a 65 mi/h headwind. On the return trip from B to A, the wind velocity is unchanged. The trip from B to A takes 65 min less than the trip from A to B. What is the airspeed (assumed constant) of the plane relative to the air (that is, the airspeed)?
A. 530 mi/h B. 400 mi/h C. 480 mi/h D. 610 mi/h
Compound Microscope: You have a choice between two lenses of focal lengths fa and fb, where fb = 2fa, to use as the objective lens in building a compound microscope. If the magnification you obtain using lens a is Ma, what will be the magnification when using lens b?
A. Mb = 2 Ma B. Mb = 4 Ma C. Mb = 8 Ma D. Mb = Ma/4 E. Mb = Ma/2
Define velocity, and give an example