Supernovae are the main source of ____ in the interstellar medium
a. cosmic rays
b. helium
c. dust
d. carbon
e. synchotron radiation
c
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In the Northern Hemisphere, between what dates does the location of the Sun's rising and setting shift a little farther south each day?
A. from June 21 until December 21 B. from September 22 until March 20 C. from March 20 until September 22 D. from December 21 until June 21
A tank holds a 1.44-m thick layer of oil that floats on a 0.96-m thick layer of brine. Both liquids are clear and do not intermix. Point O is at the bottom of the tank, on a vertical axis
The indices of refraction of the oil and the brine are 1.40 and 1.52, respectively. A ray originating at O crosses the brine-oil interface at a point 0.60 m from the axis. The ray continues and emerges into the air above the oil. What is the angle that the ray in the air makes with the vertical? A) 48° B) 51° C) 54° D) 57° E) 60°
How does the mass of Jupiter compare to the rest of the planets in the Solar System?
A. Jupiter's mass is about equal to the sum of the terrestrial planet masses. B. Jupiter's mass is about equal to the sum of Uranus and Neptune's masses. C. Jupiter and Saturn have comparable masses. D. Jupiter's mass is greater than all the other planet masses combined.
Electronegativity increases ______________ across a period and ______________ in a group
a. right to left; bottom to top b. left to right; top to bottom c. right to left; top to bottom d. left to right; bottom to top