Conversions/Significant Figures/Graphing/Measurements



Conversions/Significant Figures/Graphing/Measurements11811001270Graphing First, draw a best fit line as close to as many points as possible using a straight edge. Then use that line to answer the questions below about the line you drew. Slope = ______________Units for slope ________________y-intercept = ________________ Units for intercept______________How many sig figs should you include?___________________Fix your answers to reflect the correct #.What does the slope of this graph tell us about walking (hint: think about the units)?What does the y-intercept of this graph tell us (hint: think about the units)?Explain how two excellent students working on this same graph could get two different answers for the slope (neither made mistakes).Using the ruler below, report the length of the bold line with a range of uncertainty with units and the right number of sig figs.l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l 0 1 2 3cmLine is ___________________In lab, Sally measured a block to be 2.34 +/- 0.03mbut Harold measured the same block as 2.38 +/- 0.03m. Which measurement is correct? Explain.On a test you scored 3 wrong out of 50 questions. What percent did you get wrong?_______________Range of uncertainty reports how “wrong” a measurement is. Using the same method as the percent wrong above, calculate the percent uncertainty if you report a measurement as 2.34 +/- 0.03m _____________How many significant figures do the following numbers have?3.467________________4.0980________________509.0________________3900________________50089________________200.________________0.0090________________Calculate to the correct number of significant figures.5.908 x 400 =________________3.6 x 444 =________________5.99/ 0.06 =________________(3.5060 x 90.0)/33________________200 + 13.90________________0.97 – 0.034________________7840.9 + 0.12________________What can you tell me about the difference in the quality of these two measurements?And 3.45678Why do scientists have to use significant figures?Convert the following and use significant figures. Note: We assume conversion factors are infinitely correct therefore they do not limit, or change, the number of sig figs in an answer.24.7cm = ________________mm6.576 kg = ________________mg15.3 inches = _____________cm20.km/hr = ________________m/s40.miles/hr = ________________m/s ................
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