SIGNIFICANT FIGURES AND UNCERTAINTY WoRKSHEET a) Suppose you are using a timer t

Question

SIGNIFICANT FIGURES AND UNCERTAINTY WoRKSHEET a) Suppose you are using a timer that reads time in seconds to two decimal places. The timer started by an apparatus that has negligible uncertainty, but you have to stop it by pressing a button when you see a certain event take place. The timer reads 37 seconds. Write this time interval (including its uncertainty) to reflect your 0.2 sec reaction time. b) Same as a), but you have to start the timer as well as stop it. 2) Suppose you have done an experiment in which you took data that enabled you to calculate the speed of light. The speed you found was 186,200 miles per second. If you write your result as "186.200 misec", how many significant figures will someone reading it think it has? b) Suppose your experiment is very accurate, and you believe both zeroes in "186,200 misec" are significant. Show this by two different techniques. 3) Suppose you are performing an experiment with electrical circuits, and your instrument allows you to measure current in mA (milliamps). Assume all digits displayed by the meter are significant.Convert the following measurements to A (amps) keeping proper significant figures. b) 31.2 mA. a) 231 mA. c) 52.0 mA. 4) Perform the following operations. Write the results to reflect proper significant figures. a) 152.256 44.139 e) 5280. 12.000 b) 152.2567 44.139- 5280 12.000- g) 255.27 125.2 c) 143.5 x 2.7 d) 143.5 x 2.70 5) For the following, round the uncertainties to one significant figure and adjust the value to match. a) 632.124 cm, 0.417 b) a 4.11552 cm, Aa 0.00452 cm c) a 3276.3 g, Aa 23.5 g d) a 154.6 kg, Aa 2.6 kg 6 Following are combinations of units. Reduce each to the simplest possible combination of fundamental units (i.e. s, etc.) a) (m/s )s b) (kg uncertainty Show work on the back or on a separate sheet. c) a a) a b) a Don't forget #8 on the back of this page.

Explanation / Answer

Solving first question

1 a) 5.37+-0.2

b) 5.37+-0.4

2)it has 4 significant figure

b) 186200 mi/sec

1.86200*10(5)

3)a).231 A

b). 031 A

C) 0.052 A

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