PHYS 1510 Chapter Notes - Chapter 1: Caesium, Kilogram, Nanometre
18 Oct 2011
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1 kg is approximately equal to 2 lb. The hydrogen atoms contain 1 electron each, and the oxygen atom brings eight electrons. 1. 3: dimensional analysis (example: kg, s, m: velocity [v]= l/t (length divided by time) 1. 4: uncertainty in measurements and significant figures: all measurements have uncertainties. If we measure something with a meter stick and it seems to be 16. 3 cm we can claim that it lies somewhere between 16. 2 cm and 16. 4cm. So, it is 16. 3 0. 1: zero"s are usually not significant figures unless they are used to locate a decimal point. If we want to measure the area of a rectangular object: (16. 3 0. 1)(4. 5 0. 1) Therefore, the final answer will be 73 cm2 2. 1. 5: conversion of units: km/h m/s divide by 3. 6, m/s km/h multiply by 3. 6. 1 day= 24 hours= 1. 44 x 103 min = 8. 64 x 104 seconds.
