Question
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(g) Measurement and Significant Figures
Perform the following ealeulations and round the answers to the correct number of significant
figures (units of measurement have been omitted)

Ask by Spencer Wheeler. in Zambia
Feb 02,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

  • (i) 2.2
  • (ii) 5.01
  • (iii) 3.07
  • (iv) -17.33

Solution

Calculate the value by following steps:
  • step0: Calculate:
  • step1: Subtract the numbers:

    Calculate or simplify the expression .
    Calculate the value by following steps:
  • step0: Calculate:
  • step1: Subtract the numbers:

    Calculate or simplify the expression .
    Calculate the value by following steps:
  • step0: Calculate:
  • step1: Subtract the numbers:
  • step2: Multiply the numbers:
  • step3: Subtract the numbers:

    Calculate or simplify the expression .
    Calculate the value by following steps:
  • step0: Calculate:
  • step1: Remove the parentheses:
  • step2: Multiply the numbers:
  • step3: Convert the expressions:
  • step4: Multiply by the reciprocal:
  • step5: Multiply the fractions:
  • step6: Multiply:

    Let’s solve each part of the problem step by step, ensuring we round to the correct number of significant figures.

(i) Calculation of

  1. Calculate the numerator:
  2. Divide by the denominator:
  3. Significant Figures: The number has 2 significant figures, which is the limiting factor. Therefore, we round to 2 significant figures:

(ii) Calculation of

  1. Perform the subtraction:
  2. Significant Figures: The number has 3 significant figures, and has 3 significant figures. The result should be rounded to the least number of decimal places, which is 2:

(iii) Calculation of

  1. Perform the subtraction:
  2. Significant Figures: Both numbers have 2 decimal places, so we keep 2 decimal places:

(iv) Calculation of

  1. Calculate the parentheses first:
  2. Multiply:
  3. Subtract from :
  4. Significant Figures: The number has 3 significant figures, and has 5 significant figures. The result should be rounded to 2 decimal places (the least precise measurement):

Summary of Results

  • (i)
  • (ii)
  • (iii)
  • (iv)

Answered by UpStudy AI and reviewed by a Professional Tutor

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Bonus Knowledge

When performing calculations with significant figures, it’s essential to adhere to the rules that govern them. For multiplication and division, the result should reflect the least number of significant figures present in any of the numbers used in the calculation. Similarly, for addition and subtraction, the result should be rounded to the least number of decimal places. This ensures that the precision of your final answer accurately reflects the precision of your initial measurements.
One common mistake is misidentifying the number of significant figures in a number. For example, in the case of trailing zeros, they only count if they come after a decimal point (e.g., 100. has three significant figures, while 100 has one). Always double-check the numbers before performing your calculations to maintain accuracy in your significant figures!

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