mekus mekus
What do we call the system of units that do not change and can be duplicated around the world.
International System / S.I.
T/F
In scientific notation, the coefficient is always a whole number.
False.
The coefficient in scientific notation can be a decimal, but it must be between 1 and 10.
T/F
Measurement can be precise but not accurate.
True.
Precision relates to the consistency of measurements, so measurements can be close to each other (precise) without being close to the true value (accurate).
A centimeter ruler has an uncertainty of 0.05 cm. What is the correct expression of measurement for a length of an object which is 2.5 cm long?
(2.50 ± 0.05)cm
When you're taking multiple measurements of the same quantity, and the variation between measurements appears to be caused by unpredictable fluctuations, what term do we use for these variations?
random error
In what form do we write scientific notation.
M x 10n
T/F
One kilometer is equal to 1000 meters.
True.
T/F
Accuracy is a measure of random errors in measurements.
False.
Accuracy is primarily concerned with systematic errors, which cause measurements to consistently deviate from the true value.
If you were repeatedly measuring the same object, and your measurements fluctuate in both directions from the true value without a consistent pattern, what term would you use to describe this variation?
random error
Change from standard form to scientific notation: 164653508244
use 1 decimal place
1.6 x 1011
It is a way of expressing numbers that are too big or too small to be conveniently written in decimal form or whole numbers.
Scientific Notation
Scientific notation helps simplify the representation of numbers by expressing them as a product of a coefficient and a power of 10.
T/F
A measurement of 0.0056 kilograms can be expressed as 5.6 grams.
True.
0.0056 kilograms is equivalent to 5.6 grams. The metric system allows for easy conversions between units.
T/F
Calibrating measuring instruments helps improve both accuracy and precision.
True.
Calibration helps ensure that a measuring instrument provides accurate measurements by aligning it with a known reference standard, which, in turn, can enhance precision.
When you are weighing a sample on a scale, and the scale consistently shows a weight higher than the true value, what kind of error is this?
systematic error.
Change from standard form to scientific notation: 0.000 003 657 134 455
use 1 decimal place
3.7 x 10-6
It refers to the closeness of two or more measurements to each other.
precision
T/F
In scientific notation, a positive exponent indicates a very large number.
True.
A positive exponent in scientific notation signifies that the number is a large number, often greater than 1.
Which of the following values is the GREATEST?
A. 0.0056
B. 0.56
C. 5.6 x 10^-2
D. 5.6 x 10^1
D
Suppose you are conducting an experiment, and the recorded data points scatter in a way that doesn't follow any particular pattern. What do we call this type of variation in data?
random error
convert 7 lb to g
3 175.14 g
T/F
Is measurement should be standardized for confusion and irregularities?
False.
We need to standardized measurement for uniformity.
T/F
A measurement with high precision is more accurate than a measurement with low precision.
False.
Precision and accuracy are different concepts. Precision refers to how close measurements are to each other, while accuracy refers to how close measurements are to the true value. A measurement can be precise but not accurate if it consistently differs from the true value.
When you consistently hit a target slightly to the left, is that a systematic error or random error?
systematic error
If you are timing a runner in a race, and the stopwatch you're using consistently starts a little late, is this a systematic or random error?
systematic error
convert 4 h to s
14 400s