Question

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I. You masure the kength of a board with a ruler that is olde and has a wom -down end If you align the end of the board wih the end of the raler, wha type of uncettainty does the end of the ruler contribule to the measurement? A) Random B) Systematic 2· The average height of children in kindergarten th Wintipeg is fund by measuring the height ofone tandomily- selected child in every kindergarten class sample of children to measure the city. What type of uncertainty is due to the selection of the A) Random B) Syatematic 3. The acceleration due to gravity is calculated by measuring the time for an empty box to tall 100 m, starting from rest. What is the type of uneertainty that is contribsted by air resistance? A) Random B) Sysaematic find the sample standard deviation of the following set of four values (your anewer should have two digits fer the decimal place): Two feces point in opposite directions Their magnitudes are F1 and F2 and their uncertainties are Δ, and To find the not Sonve, a student must sobtract the foce magnitude a) Using ths addition and subtraction rale for peopagation of uncertaintics, select the expression for the uncertainty in the net force Form:Pxy DI AF-3 b) lfthe resuls of the force measurements ae F (10.7+0.9) N and F:-(169 0.6) N, what is the uncertairay in the net force (n N)Ideet round? Your Amwer a) The mass of an objest is mcasured to be 127 g with an uncertainty of 12 g. The comectly rounded off uncartainayis g and the coerectly eounded off value is b) The force on an object is measarod to be 0423 N with an uncertainty of 067 N. The comectly rounded off N and the oorrectly rounded off valse is 7. Two friends bonow police radar guns to record the speeds of cars driving through the sop sign ouside their elementary school. They hoth observe one car that is driven partioularly recklessly The first person ses the speed to be 3065 m/s with an uncertainty of 0 27 mis while the second one mcasures the speed to be 30.01 ms with an unccrtainty of O.36 m/s. The two measuroments agree within their uncertaintics Question I options: A) True

Answer 1

systematic error produced when the ruler shift the measurement with same amount and in same direction by the true value but random error came into account when the true value vary with some random amount every time and in different direction. Hence

(1) There will be random error because the ruler is old hence it is difficult to take exact measurement when the measurement falls between two markings. Old ruler may have no clear markings or low least count.

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