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Express the following in SI units : (i) 5' 6'', the average height of an Indian man. (ii) 80 miles per hour, the average speed of a roadways bus. (iii) 100 pounds, the average weight of an Indian girl. (Take 1 lb = 454 g) (iv) -10^(@)C, the lowest temperature in Simla. (v) 2 litres of milk, the average consumption of a family of 4 persons. (vi) 14 pounds per square inch (atmospheric pressure) |
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Answer» (after rounding off to have 3 significant figures as that of the least precise term) (ii) `("80 miles")/("1 hour")xx("80 miles")/("1 miles")xx("1760 yd")/("1 ft")xx("3 ft")/("1 yd")xx("12 in")/("1 ft")xx("2.54 cm")/("1 in")xx("1 m")/("100 cm")=35.76ms^(-1)=35.8ms^(-1)` (iii) `100lb=100lbxx(454g)/(1lb)xx(1kg)/(1000g)=45.4kg` (iv) `-10^(@)C=-10+273.15K=263.15K` (v) `2L=2Lxx(1000cm^(3))/(1L)xx(1dm)/(10cm)xx(1dm)/(10cm)xx(1dm)/(10cm)=2dm^(3)` (vi) `(14lb)/("1 inch"^(2))xx(1kg)/("2.205 LB")xx("1 inch")/("2.54 cm")xx("1 inch")/("2.54 cm")xx("100 cm")/("1 m")xx("100 cm")/("1 m")="9841.3 kg per square metre."` |
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