Which of the following is NOT a basic requirement for chemically based life?
A) a liquid medium to transport biological molecules
B) a source of molecules from which to build living cells
C) oxygen from photosynthesis
D) a source of energy to fuel metabolism
C
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________ used the extensive records of planetary positions measured by ________ to discover that the orbits of the planets are ________.
A. Kepler; Galileo; elliptical B. Kepler; Tycho; elliptical C. Tycho; Kepler; elliptical D. Tycho; Kepler; circular
Suppose the Hubble constant turned out to be 130 km/sec/Mpc and not 65 km/sec/Mpc. How would that affect our estimate of the age of the Universe?
A. The Universe would be about 7 billion yrs old. B. The Universe would be about 30 billion yrs old. C. It would have no effect on our estimates of the Universe's age. D. The Universe would be about 130 billion yrs old. E. None of these choices is correct.
On a Hertzsprung-Russell diagram, where would we find stars that are cool and dim?
A) upper right B) lower right C) upper left D) lower left
Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of –1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
a. 42 N/C b. 84 N/C c. 34 N/C d. 68 N/C e. 0