Diagram 1
Diagram 2
Diagram 1 shows the scale of a micrometer screw gauge when the anvil and spindle are closed. Diagram 2 shows the scale of the micrometer screw gauge when it is measuring the thickness of a piece of glass.
Rajah 1 menunjukkan skala sebuah tolok skru mikrometer semasa anvil dan bidal ditutup. Rajah 2 menunjukkan skala tolok skru mikrometer itu semasa mengukur ketebalan sekeping kaca.
What is the zero error of the micrometer screw gauge and the actual thickness of the glass?
Berapakah ralat sifar tolok skru mikrometer itu dan ketebalan sebenar kaca itu?
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Answer
B
Zero error = -0.02 mm
Reading = 12.5 + 0.34
= 12.84 mm
Actual Thickness = Reading- zero error
=12.84 mm - (-0.02 mm)
=12.86 mm