A star of magnitude 1 appears _______________ times brighter than a star of magnitude 2
a. 5.21
b. 3.14
c. 10
d. 2.51
d
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Consider a situation where two moving objects collide and rebound from each other. Which of the following is not an example of potential energy?
a. The energy stored in a pile driver. b. The energy stored in a stretched spring. c. The energy of a body moving across a horizontal surface. d. The energy in the water at the top of a waterfall.
If Star A is closer to us than Star B, then Star A's parallax angle is ________
A) fewer parsecs than that of Star B B) hotter than that of Star B C) smaller than that of Star B D) larger than that of Star B
When the relative humidity is 100%, the air temperature is equal to
a. the lapse rate. b. 100°F. c. the dew point temperature. d. none of these.
A very light ideal spring stretches by 21.0cm when it is used to hang a 135-N object. What is the weight of a piece of electronic equipment that would stretch the spring by 44.9cm if you hung the equipment using the spring?
A) 405 N B) 289 N C) 176 N D) 63 N