Since the Moon is about 0.5 degrees in angular diameter, about how far does it move in 24 hours across the background of the constellations?
a. 0.5 degrees
b. 1.0 degree
c. 2 degrees
d. 9 degrees
e. 13 degrees
e
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By what factor should the length of simple pendulum be changed in order to triple the period of vibrations?
a. 3 b. 6 c. 9 d. 1/3
The helium atom has one more electron than hydrogen. The chemical properties differ because helium
A. and hydrogen are equally reactive since chemical bonding has nothing to do with the number of electrons. B. has neutrons in the nucleus. C. is much less reactive, since its two electrons form a stable closed shell. D. is more reactive, since it has two electrons that can form chemical bonds.
Which of the following terms is given to a pair of stars that we can determine are orbiting each other only by measuring their periodic Doppler shifts?
A) visual binary B) eclipsing binary C) spectroscopic binary D) double star E) none of the above
Edwin Hubble and Milton Humason discovered that there was a linear relationship between a galaxy's ____
a. rotation curve and distance b. mass and luminosity c. age and distance d. apparent recession velocity and distance e. mass and recession velocity