Measuring gravitational difference using pendulum
A pendulum with a length of precisely can be used to measure the acceleration due to gravity, . Such a device is called a gravimeter.
a) How long do oscillations take at sea level, where ?
b) Suppose you take a gravimeter to a spot on Venus where the value of is less than the value of at sea level on Earth. How long do oscillations take at this place on Venus?
c) You have a stopwatch that can measure time differences of . How many oscillations would you need to be able to measure the gravitational difference?
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