... balls=× ×= × ≈40 40 15251833 3 3. The estimate could vary by an order of magnitude or more, depending on the assumptions made. 2.4 4 3 24 3600 s1 0 0006214.. light yr 365 d h 1.86 10 ... poor temperature control, errors in time measurements, delays in taking the samples, impure reactants, impurities acting as catalysts, inadequate mixing, poor sample handling, clerical errors ... Change in pond level ( ) ( )()8321110 (since )AwAAppwApAWAwpWWhhAggAρρρρρρρρ−−−=−=<< ⇒ the pond level falls (b) Change in boat level ( ) ( ) ( )}0094521111110pAAApppApWpWbpWbAWVhhAgAAAAAρρρρρ>>−−=−+=+−>6447448...