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Convert 342 mm to centimeters.
34.3 cm
the set of standards that defines the units of measurement used principally in science
Systeme International
Units of measurement that come from basic SI units are called_________________.
Derived units
Any digits in a measurement that may be reported with integrity, including the digits whose values are certain according to the instrument scale calibrations
along with one estimated digit
Significant Figures
Convert 54 km to mm.
5.4 * 10^7 mm
What is the unit for Thermodynamic Temperature?
Kelvin
What is the conversion factor equal to?
1
How close a number is to its actual value
Accuracy
Round to place value of estimated digit in least precise quantity when performing what operation?
addition and subtraction
How many significant figures in 5.040 m?
4 significant figures
How many significant figures in 0.00050040030 g?
8
What are the three benefits of using SI?
Has only one unit for each measurable dimension
Units can be verified easily
Units can be scaled by factors of ten (makes converting between units easier)
Exactness of a number or measured data
Precision
When are zeros significant?
zeros between significant figures and all ending zeros to the right of the decimal point are significant
A student observes a desk to be 60.5 cm. The actual value is 62 cm. What is the percent error?
-2.4%
Find the volume in milliliters occupied by 454 g of copper, which has a density of 8.92 g/mL. (d=M/V) - make sure to use the steps for solving problems
m = 454 g, d=8.92 g/mL, V =?
d=m/V ; 8.92 g/mL = 454 g/V
V = 454 g / 8.92 g/mL ; V = 51.0 mL
What is the unit for electric current?
Ampere
The accepted value for a measurement is 8.000 units and your measurement is 8.0001 units. How would you characterize your measurement? (accurate, precise, neither, both)
accurate and precise
What is the math rule for multiplication and division?
The product or quotient of measured data cannot have more SF than the measurement with the fewest.
Answer with correct significant figures:
1.17 * 10^3 mL + 2.315 * 10^2 mL
1.40 * 10^3 mL
Measurable quantity of an object or system, such as length, mass, time, or volume
Dimension
List the 7 fundamental units
length, time, Mass, Electric current, Luminous intensity, Amount of substance, Thermodynamic temperature
You must estimate to the nearest ______________ of the smallest decimal increment.
1/10th
What are the four steps in problem solving?
Write what you know
Write the formula and solve for the unknown
Plug in known values and evaluate
Estimate and calculate
Check
Record your answer
(1.9 * 10^5 kg)/(6.36 m^2 * 14.33 m)
2.1 * 10^3 (kg)/m^3