A star has absolute luminosity equal to that of the sun but is 10 pc away from the Earth
By what factor will it appear dimmer than the sun? The earth is 1.5 × 108 km from the sun, and 1 parsec is equal to 3.09 × 1016 m.
A) 2 × 10-9 B) 2 × 10-11 C) 2 × 10-15
D) 2 × 10-13
D
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A shock wave is produced when the speed of an object
A) matches the speed of sound in air. B) exceeds the speed of sound in air. C) greatly increases in amplitude. D) none of the above
I walk six miles in a straight line in a direction north of east, and I end up four miles north and several miles east. How many degrees north of east have I walked?
a. 19° c. 60° b. 42° d. 71°
The enthalpy of mixing for a pair of polymer molecules is related to the _____________parameter of the two molecules.
Fill in the blank(s) with the appropriate word(s).
A block of ice at 0°C is added to a 150. g aluminum calorimeter cup that holds 200. g of water at 10°C. If all but 2. g of ice melt, what was the original mass of the block of ice?
A) 47.6 g B) 38.8 g C) 62.2 g D) 42.0 g E) 31.1 g