Practice Pakistan questions with answers and explanations.
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Average velocity is a vector based on net displacement.
A round trip can have zero average velocity.
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Slope gives change in displacement per unit time.
That is the definition of velocity.
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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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Displacement is a vector from initial to final position.
It can be zero even when distance traveled is not zero.
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Distance is a scalar and depends on the actual path.
It is always nonnegative.
