A chemist adds (11.5 plusminus 0.9) grams of a powder to a beaker, then (20.7 pl

Question

A chemist adds (11.5 plusminus 0.9) grams of a powder to a beaker, then (20.7 plusminus 1.3) grams more, and finally removes (7.0 plusminus 1.4) grams from the beaker. What is the mass of powder in the beaker (with an error estimate)? (a) (25.2 plusminus 0.7) grams (b) (39.2 plusminus 0.7) grams (c) (25 plusminus 2) grams (d) (39 plusminus 2) grams (e) None of the above The density of sulfur is (2.07 plusminus 0.01) grams/em^2. The density expressed in is kg/m^2: (a) (2.07 plusminus 0.01) 10^3 kg/m^2 (b) (2.070 plusminus 0.010) 10^3 kg/m^3 (c) (2.07 plusminus 0.01) 10^3 kg/m^3 (d) (2.07 plusminus 0.01) 10^-3 kg/m^3 (e) None of the above The length which is closest to your height is: (a) 1500 mm (b) 15,000 mm (c) 150 mm (d) 150,000 mm Increasing the number of trials in an experiment improves the: (a) accuracy (b) precision (c) accuracy and precision d) none of the above Systematic errors affect the measurement's: (a) accuracy (b) precision (c) accuracy and precision (d) none of the above Which of these two measurements of the free-fall acceleration is more precise? (a) (9.7 plusminus 0.5) m/s^2 (b) (8.6 plusminus 0.1) m/s^2 The speed of a wave traveling through a stretched string is directly proportional to the: (a) density per unit length of the string (b) square of the tension (c) squareroot of the tension (d)square of the density per unit length e) squareroot of the density per unit length

Explanation / Answer

2) The answer to this question is C. You just convert the grams into kilograms and centimetre into metres.

3) The length closest to your height is 1500mm.

4) Increasing the number of trials in an experiment increases the accuracy.

5) Systematic error affects the measurement's accuracy.

6) The second option is more precise.

7) The velocity is directly proportional to the square root of the tension in the string.

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