____water clock
____mechanical clock
____quartz crystal clock
____pocket watch
____pendulum clock
____atomic clock
____marine clock
____hourglass
____sundial

2. (2 points) How many days are there between one new moon and the next?

. . 21 days. . . 28 days. . . 29.5 days. . . 30 days. . . 31.5 days. . . 42 days

3. (3 points) If you wanted to celibrate Christmas twice, how would you do it? (be specific)
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 4. (1 point) Which one of these clocks will work anywhere on the earth at any time?

. . . Sundial . . . . .Water clock. . . . .Hourglass

5. (3 points) A local radiostation broadcasts with a 2.904 meter wavelength. What frequency would you tune your radio to to listen to this station?
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 6. (4 points) Explain the problems inherent in a worldwide change from solar to sidereal time. (be specific)
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 7. (2 points each) Fill in the blanks:

. . A) When an observer on the earth looks up to the sky twice and sees the same stars in the same positions, this period of the earths rotation is called the _______________ day.

. . B) The path the sun makes across the sky is called the _______________.

. . C) In the month of ________________ the earth moves the fastest in its orbit.

. . D) The ________________ were the first ancient people to use sundials.

. . E) The mass on the end of a pendulum is called a ________________.

. . F) Sirius is nicknamed _________________________________.

. . G) Nicknamed the ___________________________________________, in 46 B.C. Caesar made the year 445 days long to set things right, starting the Julian Calendar.

. . H) ___________________ were ancient Egyptian sun clocks which were tall, four-sided tapered monuments. The best example is Cleopatra's Needle.

8. (6 points) Greg builds a pendulum clock on earth with a period of 2.5 seconds. He then travels to the planet Mars. What will be the new period of the pendulum on Mars?
Mass of Mars= 6.45X10^23 kg
Radius of Mars= 9.4X10^6 meters
G= 6.67X10^-11 Nm^2
a= GM/r^2
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 9. (6 points) A spaceship travels away and then back to the earth at an unknown constant speed. The ship sends out 10 pulses on the way out and 10 pulses on the way in. According to the ships clock it sendsout a pulse every 4 minutes. On the ships way out the pulses register 12 minutes apart on earth. On the ships way back the pulses register 3 minutes apart on earth.
How long is the trip according to the spacemen?
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 How long is the trip according to the people on earth?
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 At what speed did the space ship travel?
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