How does the density of copper at its melting point of 1356 K compare to that of copper at room temperature, 293 K? Its linear expansion coefficient is 
?
A. 1.054 times as large
B. 1.018 times as large
C. 0.946 times as large
D. 0.982 times as large
E. 0.947 times as large
C. 0.946 times as large
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On the Moon, no air is present. As such, which of the following waves cannot be detected
a. optical b. infrared c. radio d. sound
Center of Mass: In the figure, four point masses are placed as shown. Assume that all the numbers in the figure are accurate to two significant figures. What are the x and y coordinates of the center of mass (or center of gravity) of this arrangement?
A. (2.2 m, 2.6 m) B. (2.2 m, 2.7 m) C. (2.3 m, 2.6 m) D. (2.3 m, 2.7 m) E. (2.3 m, 2.8 m)
Suppose that an object doubles its luminosity in 10 hours. What can we conclude?
A) The object must be a quasar. B) The object must be a Cepheid variable star. C) The object is no more than about 10 light-hours across. D) The object must be very far away, making it one of the most luminous objects in the universe. E) The object is being orbited by another object with an orbital period of 10 hours.
What did the Huygens and Cassini probes find on the surface of Titan?
A) Rocks and no water B) Methane oceans C) An ocean and some lakes of methane, ethane, and other hydrocarbons D) Lakes and oceans of water E) No methane, no water; just rocks