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1 markSI Units

CAPE Physics Unit 1 · 1999 · Paper 2 · Question 5(a)(iii)

How would you use base quantities or units to check the homogeneity of physical equations? State ONE way in which an equation that is homogeneous may, nevertheless, be physically incorrect.

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Other parts of this question

  1. 5(a)(i)Three important 'base quantities' are mass, length and time. Explain the term 'base quantity' and give another example of a 'base quantity'.[7 marks]
  2. 5(a)(ii)If in another system of units the base quantities and units are mass/kg, length/m, and force/N, what would be the unit of time?[1 mark]
  3. 5(b)(i)Assuming the given equation to be homogeneous, show that the SI unit of η is N s m⁻².[13 marks]
  4. 5(b)(ii)Estimate the uncertainty to which η can be determined.[1 mark]
  5. 5(b)(iii)What is the actual uncertainty in the measurement?[1 mark]
  6. 5(b)(iv)Identify ONE case of random error and one case of systematic error in the measurements of the physical quantities required to determine η. Say what you would…[1 mark]

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