On a photograph of the Earth's moon, the moon measures 30 cm in diameter and a small crater measures 0.2 cm. The moon's physical diameter is 1738 km. What is the physical diameter of the small crater?
a. about 1738 km
b. about 12 km
c. about 520 km
d. about 350 km
e. about 3.5 km
B
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The physics underlying photovoltaic solar cells is
A) electron diffraction. B) photon capture. C) the photoelectric effect. D) none of the above
What is the mass-to-light ratio for the inner region of the Milky Way Galaxy, in units of solar masses per solar luminosity?
A) 1,000 B) 600 C) 100 D) 6 E) 0.1
Addition by 1. Components: Three forces, 
1, 
2, and 
3, all act on an object, as shown in the figure. The magnitudes of the forces are: F1 = 80.0 N, F2 = 60.0 N, and F3 = 40.0 N. The resultant force acting on the object is given by 
A. 180 N at an angle of 60.0° with respect to +x-axis. B. 60.0 N at an angle of 90.0° with respect to +x-axis. C. 20.0 N at an angle of 34.3° with respect to +x-axis. D. 35.5 N at an angle of 34.3° with respect to +x-axis. E. 40.0 N at an angle of 60.0° with respect to +x-axis.
What causes the arcs and bubble shapes in the dust and gas distribution of the Orion Nebula?
A.) Previous generations of supernovae. B.) Photon pressure of newly formed stars. C.) Gravity waves from black holes. D.) Stellar wind from local stars. E.) Synchrotron radiation.