In multiplication and division of measurement______________?
Correct answer: A. Percentage uncertainties are added
- A. Percentage uncertainties are added
- B. Absolute uncertainties are added
- C. Percentage uncertainties are divided
- D. Absolute uncertainties are divided
Explanation
For multiplication or division, fractional uncertainties combine, so percentage uncertainties are added. For example, if x = ab, then the percentage uncertainty in x is the percentage uncertainty in a plus that in b. Students may choose B by applying the addition rule for absolute uncertainties, which belongs to sums and differences.
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About Displacement and Velocity
Displacement is the directed change in position, while velocity is the rate of change of displacement and includes both magnitude and direction. The topic connects position-time and velocity-time graphs with average and instantaneous values, and distinguishes displacement from distance and velocity from speed.
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