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"You are given an accurate barometer, how would you use it
He answered: "Go to the top floor, tie a long piece of string to the
The examiner wasn't satisfied, so they decided to interview the guy:
"Sure, go to the top floor, drop the barometer off, and measure how
"Not, quite what we wanted, care to try again ?"
"Make a pendulum of the barometer, measure its period at the bottom,
"..another try ?...."
"Measure the length of the barometer, then mount it vertically on the
"....and again ?...."
"walk up the stairs and use the barometer as a ruler to measure the
"...One more try ?"
"Find where the janitor lives, knock on his door and say 'Please, Mr.
Story of a Physics student who got the following question in an exam:
to determine the height of a skyscraper ?"
barometer, let it down 'till it touches the ground and measure the
length of the string".
"Can you give us another method, one which demonstrates your knowledge
of Physics ?"
long before it hits the ground......"
then measure its period at the top......"
ground on a sunny day and measure its shadow, measure the shadow of the
skyscraper....."
height of the walls in the stairwells."
Janitor, if I give you this nice Barometer, will you tell me the height
of this building ?"
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