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Density and pressure

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Question 13

A student measures the side length of a square zinc plate using a digital caliper. The digital caliper gives readings to the nearest 0.01 mm0.01\text{ mm}0.01 mm.

a.

The student measures the side length of the plate eight times. Her readings are:

  • 42.53 mm42.53\text{ mm}42.53 mm
  • 42.51 mm42.51\text{ mm}42.51 mm
  • 42.55 mm42.55\text{ mm}42.55 mm
  • 42.52 mm42.52\text{ mm}42.52 mm
  • 42.79 mm42.79\text{ mm}42.79 mm
  • 42.54 mm42.54\text{ mm}42.54 mm
  • 42.51 mm42.51\text{ mm}42.51 mm
  • 42.53 mm42.53\text{ mm}42.53 mm

Identify the anomalous reading.

[1]
b.

Calculate the average side length of the plate.

[2]
c.

The student wants to find the thickness of a single zinc plate. She takes fifteen similar zinc plates, stacks them together, measures their total thickness, and divides this value by 151515. State whether you agree with this method and explain why.

[2]
d.

The student wants to find the density of the zinc. She uses her values for the average side length and thickness of the plate to calculate its volume. Describe what else she must do to obtain a value for the density of the zinc.

[4]

Density and pressure Questions

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  3. /Density and pressure