Chapter 1 Flashcards
What are fundamental quantities?
Quantities so basic that all other quantities are expressed in terms of them.
What are quantities if they are not fundamental?
Derived quantities
How many fundamental units are there?
7
What is the fundamental unit for length?
Metre
What is the unit for mass?
Kilogram
What is the unit for time?
Second
What is the unit for current?
Ampere
What is the fundamental unit for temperatures?
Kelvin
What are moles?
The amount of substance of a system that contains as many elementary entities as there are atoms in 0.012kg of carbon-12
What is the unit of luminous intensity?
Candela
What is a ‘pascal’ formed using fundamental units?
(m^-1)(kgs^-2)
What is a Newton measuring?
Force
What is a Newton in terms of fundamental units?
kgms^-2
What is 3456 to three significant figures?
3460
What is 3052 to three significant figures?
3050
What is 0.482828 to two significant figures?
0.48
What is the speed of light?
3.00 x 10^8 ms^-1
When can you add or subtract numbers with exponents?
when the exponent is the same
What is an order of magnitude?
A number rounded to the nearest power of 10
What are physical quantities?
Things that are measurable.. Eg: mass, length, time
