Practice NET Engineering questions with answers and explanations.
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One kilometre equals 1,000 metres.
Therefore 3.5 km = 3.5×1,000 = 3,500 m.
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One metre equals 100 centimetres.
Therefore 250 cm ÷ 100 = 2.5 m.
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Percentage uncertainty is absolute uncertainty divided by measured value times 100.
0.2/10.0×100 = 2%.
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Percentage error is |48-50|/50×100.
The result is 2/50×100 = 4%.
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Move the decimal four places to the right to obtain 7.2.
Therefore the exponent is -4.
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Use the Pythagorean theorem for perpendicular components.
Magnitude = √(3²+4²)=5.
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The x-component is A cosθ.
10 cos60° = 10×0.5 = 5.
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The y-component is A sinθ.
10 sin30° = 10×0.5 = 5.
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Vectors in the same direction add directly.
The resultant is 12+7 = 19 N.
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Opposite collinear vectors subtract in magnitude.
The resultant magnitude is |12-7| = 5 N.
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Accuracy describes agreement with the true or accepted value.
Systematic error can reduce accuracy.
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Displacement is a vector from initial to final position.
It can be zero even when distance traveled is not zero.
