. . a) measured duration.
. . b) measured by the apparent motion of the stars.
. . c) indicated by the apparent motion of the earth about the sun.
. . d) all of the above.
2. (1 point) How much will the earth rotate during this test if it takes you 30 minutes to complete it?
. . a) 5 degrees . b) 7.5 degrees . c) 10 degrees . d) 20 degrees
3. (1 point) The word clock was derived from the German word glocke which means:
. . a) Time . b) Hour . c) Bell . d) Day
4. (1 point) The first person to apply Galileo's pendulum work to a working clock was:
. . a) John Harrison . b) Robert Hooke . c) Christiaan Huygens . d) Galileo
5. (2 points) We are now in the Eastern Standard Time Zone. (Disregard
daylight savings time)
a) How many hours difference is there between here and the Greenwich
Meridian?
.
b) Is it earlier or later than here?
.
6. (1 point) If you E-mail a friend a letter from Atlanta, GA. to L.A., CA. at 07:00 EST will you disturb your friends sleep? (Assume sleep period from 22:00 to 07:00 and that e-mail beeps when arrives)
. . . . . . Yes. . . . . . No
7. (1 point) What do we call the accumulated calendar error that is corrected this year?
.
.
8. (1 point) The "once in a blue moon" expression is really referring to:
. a) the rarity of the moon turning this color.
. b) the moon being at an angle with the earth's ecliptic.
. c) the occurrence of two full moons within one calendar month.
. d) the occurrence of two new moons within one calendar month.
9. (2 points) A sidereal day is how much longer/shorter than a solar day?
. . a) 3 minutes 56 seconds shorter
. . b) 3 minutes 56 seconds longer
. . c) they are the same
. . d) 4 minutes 56 seconds longer
10. (3 points) The rotor of a quartz watch rotates once every second to show seconds movement on the dial. To accomplish this, a quartz crystal is charged to cause it to oscillate at its maximum frequency, and then this frequency is run through 15 divider circuits each time successively dividing this pulse in half until one Hz is emitted. This then causes the rotor to trigger. How fast is the crystal oscillating?
.
.
.
.
11. (3 points) Atlanta is 84.5 degrees West longitude. If it experiences solar noon at exactly 12:00, what time will Dallas, Tx. 97 degrees West longitude experience the same phenomenon?
.
.
.
12. (5 points) Our nation's time standard is accurate to one part in 10^14. Assuming 365 days in a year, how many years will pass before the standard loses one second?
.
.
.
13. (4 points) The SR-71 Blackbird jet is the only plane that can actually
keep up with the motion of the earth at the equator.
a) At what speed would this plane have to fly to keep the sun on the
pilot's face at all times?
.
.
b) What direction must he fly?
. . . . . . . . Eastward . . . . . . . . .Westward
14. (3 points) Jack and his wife were having an argument about time. Jack wanted to see time fly so he threw his pocketwatch at his wife. If he threw the watch with a velocity of 5m/s and his wife is 100 meters away, how long does Jack's wife have before she has to duck? (Jack and his wife are in a vaccume and in space so ignore air resistance and gravitational forces)
.
.
.
.
15. (5 points) Jack, back on earth, decides to climb a sequoia tree 1,000 meters high. When he reaches the top he again wants to see time fly so he drops his Rolex. Jack noticed the time to be 12:45:00 when he dropped the watch. What time did the watch show the instant it hit the ground? (Disregard air resistance)
.
.
.
16. (5 points) On Oscar's planet acceleration due to gravity is known to be 2.54m/s^2. If he uses a meter long pendulum for a timepiece on his planet, what will the new length of the pendulum have to be on Earth to indicate the same time intervel as it did on his home planet?
.
.
.
17. (3 points) The principle of an accurate clepsydra is having a constant flow rate and then being able to precisely measure the volume delivered. If our clepsydra flows at 2mL/s, how long will it take to fill a cubic vessel 10cm on a side? Give your answer in minutes and seconds.
.
.
.
18. (5 points) You are making a clock and need to determine how many teeth must be on the main wheel that holds the weight cord drum and drives the minute hand shaft. If the minute hand shaft has a pinion (24 teeth on it) that mates with the main wheel and we want the main wheel to turn only twice in one day (this is so we can get the amount of cord necessary on the drum). How many teeth must be on this main wheel to achieve this?
.
.
.
19. (1 point each) Match the following:
______True solar time . . . . . . a) U.T.C.
______Sidereal time . . . . . . . b) Equation of time
______Sun dial . . . . . . . . . .c) Ecliptic
______Atomic time . . . . . . . . d) Watch
______Mean solar time . . . . . . e) The Sun
20. (1 point each) Fill in the blanks
. . Example: 12=M_____ in a Y___ . . Answer: 12=Months in a Year
. . 4=S______ in a Y____
. .24=H____ in a D__
. 366=D___ in a L___Y___
.29.5=D___ in a L____C____
. .52=F______ in a Y___
21. (2 points) For how many years have we been using the Gregorian calendar?
. a) 400 years . b) 100 years . c) 240 years . d) since it was created
22. (5 points) A spacecraft is going away from the earth at a speed of 270,000,000 m/sec. How much time will elapse on the spacecraft for every 100 years on the earth? Comment on the mass of the travelers, length of the spacecraft, and inertial reference frames for this situation.
.
.
.
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