4 - Error Analysis Questions Answers

Physics >> Mechanics part 1 >> Error Analysis Engineering Exam

A m├Ętre rule has an error of 0.01.It is used to take a measurement of length of 6.03m and width of 1.32.

 

Error analysis

Get the perimeter and the area.

Asked By: MESHACK OCHIENG
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How do I go about this?

Asked By: MESHACK OCHIENG
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A resistor of 10kΩ having tolerance 10 % is connected in series with another resistor of 20 kΩ having tolerance 20 %. The tolerance of the combination will be approximately.

Asked By: SWATI KAPOOR
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Joshi sir comment

resultant = (10±1)+(20±4) = 30±5 

so tolerance = 5*100/30 = 50/3 = 16.67 %

the time period of oscillatn of a simple pendulum is 2π (l/g)1/2.  l is about 10cm & is known to 1mm accuracy. the time period of oscillatn is about 0.5s . time of 100 oscillatn with a wrist watch of 1s revolutn . what is the accuracy in determinatn of g?

ans 5%

Asked By: SARIKA SHARMA
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Solution by Joshi sir

T = 2π (l/g)1/2

so g α  l/T2

so % error in g = % error in l + 2 % error in T

                           =  0.1*100/10  + 2* 1*100/50 = 1+4 = 5

here you shoult remember that if you count 100 osccilations then time will be counted for 100 osccilation.

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