A professor had given a test to a bunch of students. As each of the studen ts finished the test they were allowed to put the finished test on the prof essors desk and leave the classroom. Everyone had left the class except one student. As the time drew close to the end of the period, the professor as ked the student if there was a problem. The student answered that there was one question on the test they he had a problem with. The professor asked w hich one it was. The student said that it was the question about how to use a barometer to measure the height of a tall building. The professor said t hat that should be a very easy question to answer. The student said that he didn?t know which answer the professor was looking for. ?T here can only be one answer knowing how a barometer works. If you take a ba rometric reading at the bottom of the building and another at the top of th e building you can calculate the height of the building. ? That? ??s not the only answer,? said the student. The professor said ?Well what other answer did you have?? ?Well? ? said the student, ?I could go to the top of the building. Tie a string to the barometer. Drop it to the ground and measure the length of the string.? ? I could go to the top of the building and dr op the barometer off the top of the building and time how long it took to h it the ground. I could take the barometer and put it on the ground, measure how tall the barometer was, how long it?s shadow was, measure the shadow of the building and calculate the height of the building. I could al so, go inside the building and starting at ground level, put the barometer up against the wall, and marking off the height of the barometer measure ho w many barometers high the building was. And lastly I could try to locate t he janitor and tell him, I?ll give you this barometer if you tell m e how tall this building is.? The student got an A on the test.
2 years ago