How do we know that the Universe is expanding?
A.) The rotation curve of stars in the Milky Way.
B.) The motion of the Andromeda Galaxy.
C.) The Doppler effect measured in many galaxies.
D.) Inflation.
E.) None of the above.
Ans: C.) The Doppler effect measured in many galaxies.
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The Kepler mission has searched for Earth-like planets by looking for the dip in the brightness of a star as a (potential) planet transits across it
Why will this technique actually miss the vast majority of planets around the stars it observes?
When a 125-kg piece of equipment is hung from a steel wire of length 75 cm, it stretches the wire by 4.00 mm. If instead the wire had a length of 150 cm, but all else were the same, by what distance would the same equipment stretch the wire?
A) 4.00 mm B) 8.00 mm C) 2.00 mm D) 16.0 mm E) 1.00 mm
A 1.75-kg picture frame is hung on the wall by means of a string as in the figure (show picture frame with distance between the points of connection on the frame labeled with 37.0cm and vertical displacement of the string as 4.00cm). What is the tension T in the string?
A. 8.6 N B. 40.6 N C. 159 N D. 17.2 N E. 79.4 N
The symbol for carbon is
a. Ca. b. Cr. c. Co. d. C.