My fearless padlet by Saurjya Sen

My fearless padlet by Saurjya Sen https://padlet.com/saurjyasen/5b1tgjrwa0coik0 Made with a wink and a smile en-us 2021-06-29 12:32:14 UTC 2025-12-14 20:57:57 UTC hello@padlet.com saurjyasen https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630033282 When two or more numbers are added and subtracted the final result should be reported to the same number of decimal places as that of the original number with minimum number of decimal places
Ex: A = 22.678 B = 234.5
A +B = 22.678 + 234.5 =
= 257.178
= 257.2
Ex : A = 345.7865 B = 100.57
A - B = 345.7865 - 100.57
= 245.2165
= 245.22

]]> 2021-06-29 12:33:12 UTC https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630033282 saurjyasen https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630043997 When two or more numbers are multiplied and divided ,the final result should be reported to the same number of significant figures as that of the original number with minimum number of significant figures
Ex: A = 23.456 B = 1.78
A.B = 23.456 * 1.78
= 41.75168
= 41.8
Ex: Mass = 5.74g Volume = 1.2cm cube
Density = Mass/Volume
= 5.74/1.2
= 4.783
= 4.8g/cmcube
]]> 2021-06-29 12:42:02 UTC https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630043997 Rule 1: How to calculate percentage error in arithmetic operations saurjyasen https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630066946 To calculate the percentage error in uncertainty of Area when a rectangular sheet of length l and breadth b is given
l = 16.2 +- 0.1cm
% error in l = Delta l/l * 100
= 0.1/16.2 * 100
= 0.6%
% error in l = 16.2 +- 0.6%
b = 10.1 +- 0.01cm
% error in b = Delta b/b * 100
= 0.01/10.1 * 100
= 0.1%
% error in b = 10.1 +- 0.1%
Combining the % error _inlength and breadth we calculate the % error in area A as A = l * b
= (l +- Delta l)(b +- delta
b)
=(16.2 * 10.1) +- (delta l/l + delta
b/b)
= 163.62 +- 1
= 164 +- 1cm square

]]> 2021-06-29 12:59:56 UTC https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630066946 Rule 2 saurjyasen https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630096171 If a set of experimental data is specified to n significant figures, a result obtained by combining the data will also be valid to n significant figures
Ex: l = 1.02 b = 1.02
A = l * b
= 1.02 * 1.02
= 1.0404
= 1.04msquare

* Sometimes in subtraction and addition of quantities the law applies and it reduces so it is not possible to get the same number of significant digits in the answer
Ex: m1 = 12.9g m2 = 7.06g
Delta m = (m1 - m2)
= 12.90 - 7.06
= 5.84
= 5.8g]]> 2021-06-29 13:20:56 UTC https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630096171 Rule 3 saurjyasen https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630111378 The relative error of a value of a number specified to n significant figures depends not only on n but also on the number itself
Ex; m1 = 1.02 +- 0.01
Relative error = +- deltam/m *
100
=+- 0.01/1.02 * 100
= +- 1%

Ex: m2 = 9.89g +- 0.01g
Relative error = +-deltam2/m2
* 100
= 0.01/9.89 * 100
= +- 0.1%

* In a multistep computation ,the intermediate step can have an increase of one significant figure
Ex: N = 9.58
R = 1/9.58 = 0.1044
N' = 1/0.1044 = 9.58]]> 2021-06-29 13:30:28 UTC https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630111378 1. All zeroes to the right of a non-zero digit but to the left of an understood decimal point are significant. saurjyasen https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630134794 Ex : 6487000.
The above number has 7 significant figures

2. When a number greater than or equal to one then all zeroes on the right as well as to the left of decimal will be significant figures.
Ex: 2.020200 - 7
10.0200 - 6

]]> 2021-06-29 13:46:18 UTC https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630134794 Important rules saurjyasen https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630260603 1. 21.34 = 21.3
2. 45.56 = 45.6
3 . 82.5 = 82.0
3. 67.45 = 67.4
4 71.75 = 71.8
5. 8284000 = 8280000
6. 248337 = 248000]]> 2021-06-29 15:15:35 UTC https://padlet.com/saurjyasen/5b1tgjrwa0coik0/wish/1630260603