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Maths!!!
發問:
1)Tommy spent 60s to complete 400m on a runnimg machine, what was his speed? (Correct to 3 significant figures.) 2)The weight of Gary is measured to be 65kg with a percentage error of 4%. Find the range of his trye weight.
最佳解答:
1)Tommy spent 60s to complete 400m on a runnimg machine, what was his speed? (Correct to 3 significant figures.) ∵speed = distance/time ∴ his speed =400/60 = 6.67 ms-1 (Correct to 3 significant figures.) 2)The weight of Gary is measured to be 65kg with a percentage error of 4%. Find the range of his trye weight. ∵maximum percentage error = maximum absoulte error/measured value ∴maximum absoulte error = measured value×maximum percentage error ∴maximum absoulte error = 65×4% = 2.6 kg upper limit = measured value+maximum absoulte error = (65+2.6)kg =67.6kg lower limit =measured value﹣maximum absoulte error =(65﹣2.6)kg = 62.4kg ∴the range of his trye weight is between 62.4kg to 67.6kg .
其他解答:
1)speed=400/60 =6.67m/s(to 3 sig.fig.) 2)65x4%=2.6 thus, range of it =65-2.6to65+2.6 =62.4to67.6(kg)
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