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1 markMeasurement

CSEC Physics · 1996 · Paper 2 · Question 1(a)(i)

Students measure the density of glass using 20 identical marbles. Volume of a sphere is (4/3)πr³, where r is radius (diameter / 2). The diameter of one marble is measured with a micrometer screw gauge shown in Figure 1.

State the reading shown on the micrometer in Figure 1.

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Other parts of this question

  1. 1(a)(ii)Express this reading in metres using standard scientific form.[1 mark]
  2. 1(a)(iii)Find the volume of ONE marble.[2 marks]
  3. 1(a)(iv)If the only available balance is calibrated to measure to the nearest gram, suggest a method that students could use to accurately find the mass of ONE marble.[2 marks]
  4. 1(a)(v)The mass of one marble was found to be 1.1 g. Express this mass in kilograms.[1 mark]
  5. 1(a)(vi)Calculate the density of the glass used to make the marbles.[2 marks]
  6. 1(b)(i)Estimate the area of the heel of her shoe.[2 marks]
  7. 1(b)(ii)The girl's mass is 45 kg. What pressure does she exert on the ground when she is standing on one heel? (g = 10 N kg⁻¹)[3 marks]

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