Halo stars are all Population II objects
Indicate whether the statement is true or false
TRUE
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Snell's Law: A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0°. What is the angle of refraction?
A. 20.9° B. 47.5° C. 51.8° D. 30.0° E. 14.9°
Suppose that Earth rotated once every 48 hours (instead of 24 hours), but Earth's orbit and the Moon's distance were still the same (and their masses were still the same). Which of the following statements would be true?
A) Along coastlines, the time between one high tide and the next would be longer. B) The length of the year would be longer. C) Along coastlines, the time between one high tide and the next would be shorter. D) The Moon's orbital period would be longer. E) There would be more days in each year.
What are the conditions necessary for a terrestrial planet to have a strong magnetic field?
A) a molten metallic core only B) fast rotation only C) a rocky mantle only D) both a molten metallic core and reasonably fast rotation E) both a metal core and a rocky mantle
A bridge is made with segments of concrete 50 m long. If the linear expansion coefficient is 12 × 10?6 (°C)?1, how much spacing (in cm) is needed to allow for expansion during an extreme temperature change of 150°F?
A. 10 B. 2.5 C. 7.5 D. 5.0 E. 9.5