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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 5 - Rotational Motion > A person measures the depth of a well by measuring the time interval between dropping a stone and receiving the sound of impact with the bottom of the well. The error in his measurement of time is δT = 0.01 seconds and he measures the depth of the well to be L = 20 meters. Take the acceleration due to gravity g = 10ms–2 and the velocity of sound is 300ms–1. Then the fractional error in the measurement, δL/L, is closest to Read more on Sarthaks.com – https://www.sarthaks.com/48473/person-measures-the-depth-of-a-well-by-measuring-the-time-interval-between-dropping-stone

A person measures the depth of a well by measuring the time interval between dropping a stone and receiving the sound of impact with the bottom of the well. The error in his measurement of time is δT = 0.01 seconds and he measures the depth of the well to be L = 20 meters. Take the acceleration due to gravity g = 10ms–2 and the velocity of sound is 300ms–1. Then the fractional error in the measurement, δL/L, is closest to Read more on Sarthaks.com – https://www.sarthaks.com/48473/person-measures-the-depth-of-a-well-by-measuring-the-time-interval-between-dropping-stone

A screw gauge with a pitch of 0.5 mm and a circular scale with 50 divisions is used to measure the thickenss of a thin sheet of aluminium. Before starting the measurement A student measurd the length of a rod and wrote it as 3.50 cm. Which instrument did he use measure it? it is found that when the two jaws of the screw gauge are brought in contact