Chapter 1: Measurement

physics

_____ is based on measurement of physical quantities.

the distance traveled by light in a vacuum during a time interval of fraction of a second

the standard for length which corresponds to exactly 1.0 meters is?

standard, unit, standard, 1.0, unit

we measure each physical quantity in its own units by comparison with a __ the ___ is a unique name we assign to measures of that physical quantity the __ corresponds to exactly ___ ___ of the quantity

base quantities, base quantities, base standards

we pick out by international agreement a small number of physical quantities such as length and time and assign standards to them alone called ____. they are both accessible and invariable. we can define all other physical quantities in terms of these ___ and their standards (called ___)

chain-link conversion, conversion factor

when we need to change units in which a physical quantity is expressed, we do so by _____ where we multiply the original measurement by a ____ (a ratio of units that is equal to unity)

second

One____ is the time taken by 9,192,631,770 oscillations of the light (of a specified wavelength) emitted by a cesium-133 atom.

atomic clocks

To meet the need for a better time standard, ____have been developed. One is at the National Institute of Standards and Technology (NIST) in Boulder, Colorado, and is the standard for Coordinated Universal Time (UTC) in the United States. Its time signals are available by shortwave radio and by telephone. They are so consistent that, in principle, two cesium clocks would have to run for 6000 years before their readings would differ by more than 1 s.

any phenomenon that repeats itself

____ is a possible time standard, like the earth's rotation = length of the day

SI, SI, meter (m), second (s), kilogram (kg), watt(W),

also known as the metric system, the ___ unit system contains 7 quantities as base quantities. what is the unit name and symbol for 3 of these ____ BASE QUANTITIES? - length - time - mass

mass/volume (m/v), kg/m^(3), g/cm^(3), 1 g/cm^(3)

density = ? and has the units of ___ or ___ what is the density of water?

derived, derived, watt, W,

many SI __ units are defined in terms of the SI base units. the __ SI unit for power is the ___(___ )

significant figures

set the number of digits that you can use in reporting your final answer

giga, mega, kilo, hecto, deka, deci, centi, milli, micro, nano, pico

the prefixes for SI units include: 10^(9) = ? 10^(6) = ? 10^(3) = ? 10^(2) = ? 10^(1) = ? 10^(-1) = ? 10^(-2) = ? 10^(-3) = ? 10^(-6) = ? 10^(-9) = ? 10^(-12) = ?

atomic mass unit (u)

we have a SECOND mass standard, called the_____(__), bc the masses of atoms can be compared with one another more precisely than they can be compared with the standard kilogram it is the carbon-12 atom, and 1 of these = 1.660 538 86 * 10^(-27) kg