Practice PIEAS Pre Engineering questions with answers and explanations.
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Distance is a scalar and depends on the actual path.
It is always nonnegative.
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Random errors cause scatter around a central value.
Repeated measurements and averaging can reduce their effect.
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Leading zeros are not significant, but trailing zeros after a decimal are.
Thus 4, 5, and the final zero are significant.
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Vector addition replaces multiple vectors with an equivalent single vector.
Its direction and magnitude depend on the original vectors.
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Perpendicular vector components form a right triangle.
The resultant magnitude is found from the sum of squared components.
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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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A vector has both magnitude and direction.
Acceleration describes the rate and direction of velocity change.
