Physics Flashcards
SI unit of amount of substance.
Mole
SI unit of luminous intensity
Candela
A cylinder with platinum-iridium alloy is used to define the kilogram. What is the name of this cylinder?
a. Le Grand K
b. pti alloy
c. standard kilogram
d. standard mass
a. Le Grand K
What is the cgs unit of force?
a. Newton
b. erg
c. dyne
d. poise
c. dyne
Only used when recording any measurements.
Uncertain digits
Only use when you are multiplying or dividing measured numbers
Significant Figures
These are always significant
- Nonzero numbers
- Sandwiched zeros
- Zeros that fall both at the end of the number and after the decimal point
These will never be significant number
zeros that act as placeholders
It is usually stated 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
The “triple point” of a substance is that point for which the temperature and pressure are such that:
solid, liquid, and vapor are all in equilibrium
the lowest velocity which a body must have in order to escape the gravitational attraction of a particular planet or other object.
Escape Velocity
thermal energy whose transfer to or from a substance results in a change of temperature
Sensible heat
the heat required to convert a solid into a liquid or vapor, or a liquid into a vapor, without change of temperature.
Latent heat
The amount of heat required to change 1 g of a substance at the temperature of its melting point from the solid to the liquid state without changing temperature.
Latent heat of fusion
It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure.
Latent heat of vaporization
Which one of the following statements is true?
a. Temperatures differing by 25◦ on the Fahrenheit scale must differ by 45◦ on the Celsius scale
b. 40K corresponds to −40◦ C
c. Temperatures which differ by 10◦ on the Celsius scale must differ by 18◦ on the Fahrenheit scale
d. Water at 90◦ C is warmer than water at 202◦ F
c. Temperatures which differ by 10◦ on the Celsius scale must differ by 18◦ on the Fahrenheit scale
statement that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature.
Stefan-Boltzmann Law
a law stating that the ratio of the sines of the angles of incidence and refraction of a wave are constant when it passes between two given media.
Snell’s law