Physics Flashcards
The SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c
Meter
The SI unit of mass. It is defined by taking the
fixed numerical value of the Planck constant h to be 6.62607015×10−34 when expressed in the unit J s, which is equal to kg m2 s−1
Kilogram
_____ is the SI unit of time. It is defined by taking the fixed numerical value of the __________ frequency ∆Vcs, the unperturbed ground-state hyperfine transition frequency of the ______________ atom, to be _________ when expressed in the unit Hz,
which is equal to s−1.
Second; Cesium; Cs-133; 9192631770
The SI unit of electric current.
Ampere
The SI unit of thermodynamic temperature
Kelvin
The SI unit of amount of substance.
Mole
The SI unit of luminous intensity in a given
direction. It is defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency ____________, Kcd, to be _______when expressed in the unit lm/W.
Candela; 540 Thz; 1/683
A cylinder with platinum-iridium alloy is used to define the kilogram. What is the name of this cylinder?
Le Grand K
What is the cgs unit of force?
dyne
What is the cgs unit of work?
erg
What is the cgs unit of viscosity?
poise
TRUE OR FALSE
When adding or subtracting measured numbers, the answer should reflect the LEAST accurate scale used in the measurements.
TRUE
In the measurement 29.4 cm, what number(s) is the uncertain digit?
4 is uncertain
Which measurement has higher uncertainty?
a. 123.4
b. 120
c. 123
d. 123.45
b. 120
396 has ___ sig. figs,
65432 has ___ sig. figs.
3 ; 5
7609 has ___sig. figs,
5.0004 has ___sig. figs.
4 ; 5
0.00020 has ___ sig. figs.
35.0 has ___ sig. figs.
2 ; 3
0.02 has ___ sig. fig.
0.0026 has ___ sig. fig.
400 has ___ sig. fig.
400. has ___ sig. figs
1 ; 2 ; 1 ; 3
TRUE OR FALSE
In multiplication or division, the resulting answer must be reported with the same number of significant figures as the measurement with the FEWEST significant figures.
TRUE
How many significant figures are in the
number 0.220?
Three, the leading zero is not significant, but the rest are.
How many significant figures should the product of 1.2 x 1.4592 contain?
2
States that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Law of Universal Gravitation
Law of Universal Gravitation
Gravitation Formula
Fg = Gm1m2/r^2
The “triple point” of a substance is that point for which the temperature and pressure are such that:
a. only solid and liquid are in equilibrium
b. only solid and vapor are in equilibrium
c. only liquid and vapor are in equilibrium
d. solid, liquid, and vapor are all in equilibrium
d.