Much to your chagrin, you find that to be the case: Despite having been rescued during the midterm, you are, once again, lost in a body of water. Fortunately, you still have your astronomical tables and instruments, as well as a UT clock. You thereby
put together the following description of your situation: ? It is the day of the summer solstice. ? The Sun is on your meridian at an altitude 73.5° in the south. ? The UT clock reads 19:00. a. What is your latitude? How do you know? b. What is your longitude? How do you know?
a. Your latitude is 40°N, where the Sun crosses the meridian at an altitude of 73.5°S on the summer solstice.
b. Your longitude is 105°W. The Sun is on your meridian, so it is noon for you. The UT clock reads 19:00, or 7 P.M., so Greenwich is 7 hours ahead of you. Each hour represents 15° of longitude, so 7 hours means 105°; you are west of Greenwich because your time is behind. In fact, it's next year's summer solstice, and you are floating on a small raft in the Boulder Reservoir. You are lost only because you have become disoriented while contemplating the four-dimensional nature of spacetime and the expansion of the universe.
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Which of the following best describes a substance in which the temperature remains constant while at the same time it is experiencing an inward heat flow?
a. gas c. solid b. liquid d. substance undergoing a change of state
Which of the following kinds of stars is most dense?
a. a supergiant star b. a main sequence star c. a giant star d. a white dwarf e. the sun
The tidal pull of the Sun largely cancels that of the Moon at the ________ phases
Fill in the blank(s) with correct word
Collisions in Two Dimensions: A puck with a mass m1 = 50 g moving at 1.0 m/s approaches a stationary puck with a mass m2 = 100 g on a frictionless air table, and they undergo a sudden two-dimensional elastic collision. After the collision, both pucks have identical speeds, but travel in different directions. What is the angle between the original and final paths of puck with mass m1?
A. 30° B. 60° C. 90° D. 120° E. 150°