Question 10: ( 1 a level is set up midway between two stakes as shown in the figure below. The two stakes are about 200 feet apart. The rod reading on stake A is 8.72 feet and the rod reading on stake B is 5.61 feet. The level is then moved to point B and set up so that the eyepiece end of the telescope is just touching the rod as it is held plumb on the stake. A reading of 5.42 feet is taken from the rod at B by sighting backward through the telescope. Error in Ae 30 m A A Horizontal Line Line of Sight 30m (100 ft) ㅈ (a) Horizontal Line Line of Sight 60m (200 ft) (b) Horizontal Line Line of Sight 30 m (100 ft) Ae, B A0₂ }. Error in b, 30m B Error in 60m 1) What is the correct difference in elevation between the tops of stakes A and B? 2) If the level has been in perfect adjustment, what reading would have been observed at A from the second setup?

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A:

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.