Calculations

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Tutorial 5
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Calculations Some Pointers

• Units
• Must be consistent
• Use SI units
• Show working
• Shows how you approached question
• If method OK youll get marks even if the answer
  is not correct
• Check

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SI Units

• Le Système International d'Unités
• Base units
• Derived units
• See http//physics.nist.gov/cuu/Units/

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SI Base Units
5
SI Derived Units
 
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SI Derived Units
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Determining Metabolic Rate

• See Energy File Part 3 Page 6

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Calculating Basal Metabolic Rate
Where M is body mass in kg
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Example

• Calculate the BMR for a man of 47 who weighs 85
  kg
• From table 2.1 in Energy File Part 3
• BMR 0.048M 3.653
• (0.048 x 85) 3.653
• 4.08 3.653
• 7.733 MJ day -1

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Exercise 1

• Calculate the BMR for a woman of 26 who weighs 60
  kg

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Exercise 1 - Solution

• Calculate the BMR for a woman of 26 who weighs 60
  kg
• BMR 0.062M 2.036
• (0.062 x 60) 2.036
• 3.72 2.036
• 5.756 MJ day -1

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BMR Multipliers
Activity Multiplier
Sitting 1.3
Standing 1.5
Washing, Dressing 3.3
Walking slowly 2.8
Walking quickly 4.6
Walking upstairs 8.3
Light work 3.3
Moderate work 5.4
Strenuous work 7.6
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Exercise 2

• Calculate the energy expenditure of a 26 year old
  woman weighing 60 kg while she undertakes light
  work for a total of 7 hours

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Exercise 2 - Solution

• We have already determined during exercise 1 that
  this womans BMR is 5.756 MJ day 1
• As she only works for 7 hours, we need to know
  what her hourly BMR is
• BMR 5.756 / 24 MJ hour-1
• 0.240 MJ hour-1

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Exercise 2 Solution

• Over 7 hours her BMR 7 x 0.240 MJ
• 1.68 MJ
• For light work, the multiplier is 3.3
• So, the total energy expenditure during 7 hours
  of light work 3.3 x 1.68 MJ
• 5.54 MJ

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Report Writing

• Some general advice

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Report Writing

• Preparation
• Presentation
• Use of tables and diagrams
• Referencing

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Preparation

• Read question carefully
• Answer the question given!
• Gather data
• Decide on structure
• Plan

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Presentation

• Structure
• Headings and sub-headings
• Paragraphs
• Use tables and diagrams
• Where appropriate!
• Spacing
• Margins

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Tables and Diagrams

• Use to present and summarise data
• Good tables and diagrams can
• make it easy for reader to understand information
• save on word count

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Tables and Diagrams

• Think carefully about
• information you want to convey
• type and design
• location
• Titles and labelling
• always give a title
• clear labelling

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• This is my travel diary for the w/c/ 12 June 2004
• How can I simply it to present a summary of the
  information for a report on my travel pattern and
  associated energy consumption?

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(No Transcript)
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Referencing

• In text
• Authors name and date
• e.g. Smith (1998) Smith and Jones (2002)
• In bibliography
• Full details
• Format depends on reference type

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Referencing

• For further details see
• http//library.open.ac.uk/help/helpsheets/cite.htm
  l

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Example

• In Text
• Morris D and Carr S (2002, P37)
• In bibliography
• Morris D and Carr S (2002) T172 Theme 3 Food
  Chains, Milton Keynes,The Open University