You are captured by Martians, taken into their ship, and put to sleep. You awake some time later and find yourself locked in a small room with no windows. All the Martians have left you with is your digital watch, your school ring, and your long silver-chain necklace. Explain how you can determine whether you are still on earth or have been transported to Mars.
Solution 8DQ Step 1: You have to calculate the length (L) of the chain approximately. You can construct a simple pendulum by connecting the ring with the chain. Oscillate the pendulum about its mean position and calculate the time period (T) for one complete oscillation.