Ans.
1)
41.57s + 0.016s = 41.586s, since the number of the significant digits is 2 in 0.016 s, so we round the answer to two significant figures. The 3rd digits in the sum is greater than 5, we round up the sum.
The sum = 42. s
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2)
1.57 m x 12.02 m = 18.8714 m2 . SInce the number of the significant figures in 1.57 m is three we round the answer to three significant figures. The 4th digit in the product is greater than 5 so we round up the answer.
The product = 18.9 m2
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3)
1502 kg - 3.14 kg = 1498.86 kg, The number of the significant figures in 3.14kg is three we round the answer to three significant figures. Writing the answer in scientific form: 1.49886*103 kg.
The 4th digit in the product is greater than 5 so we round the answer up.
The difference = 1.50x103 kg
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4)
Performing each division before adding them.
i) 999.0m/6.00s = 166.5 m/s and this rounds to 166 m/s (6.00s has 3 sig fig and the digit before 5 is even so we ignore 5)
ii) 888m/5.00s = 177.6 m/s and this rounds to 178 m/s
iii) 444m/4.80s = 92.5 m/s
Now we add them up
The answer = 166 + 178 + 92.5 = 436.5 m/s and this rounds to 436 m/s(answer)
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