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- After being lost in space for months, your spacecraft just landed on what
- looks like a desert on Earth. Could you have been lucky enough to really
- have landed on your home planet? As you walk around on the surface, you
- notice that, after many months of weightlessness, gravity feels very
- different than it used to feel on Earth. Is gravity really different here
- or has the long trip affected you?
-
- You unpack your bathroom scale and you find that your weight has really
- changed considerably. Was it the food on the spacecraft...? Or perhaps,
- your weight has changed but your mass hasn't. Gravity is just different
- here. This may not be Earth after all!
-
- The best way to find out whether or not you're on Earth is with a pendulum
- and a stop watch. Carefully measure the length and the period, and use the
- pendulum formula to find g. Remember that this simple formula is only
- accurate for small oscillation amplitudes. Repeat your measurements until
- you get consistent results. If you need instructions on how to make these
- measurements, go back to PRACTICE and read that "help" screen.
-
- The batteries in your watch are almost dead and you must build an old
- fashioned clock using another pendulum to keep track of time. Based on
- your previous result, how long must this pendulum be to have a period of
- one second. Check your calculations and press F2 to enter your answers.