Physical Quantities & SI Units Flashcards
1
Q
What are the SI units for the following?
- Length
- Mass
- Time
- Temperature
- Electric Current
- Luminous Intensity
- Amount of substance
A
- Length: metre/m
- Mass: kilogram/kg
- Time: second/s
- Temperature: Kelvin/K
- Electric Current: Ampere/A
- Luminous Intensity: Candela/cd
- Amount of Substance: moles/mol
2
Q
What are the base 10 values of the following prefixes?
- Giga
- Mega
- Kilo
- Hecto
- Deca
- Deci
- Centi
- Milli
- Micro
- Nano
- Pico
A
- Giga: 10⁹
- Mega: 10⁶
- Kilo: 10³
- Hecto: 10²
- Deca: 10¹
- Deci: 10⁻¹
- Centi: 10⁻²
- Milli: 10⁻³
- Micro: 10⁻⁶
- Nano: 10⁻⁹
- Pico: 10⁻¹²
3
Q
To convert km h⁻¹ to m s⁻¹, you’ll have to:
A
÷ 3.6
4
Q
To convert m s⁻¹ to To convert km h⁻¹, you’ll have to:
A
× 3.6
5
Q
What are the values associated with the imperial units?
Mass, m (kilogram):
- 1lb
- 1 oz
- 1 stone
Length, l (metre):
- 1 in
- 1 ft
- yd
- mi
A
Mass, m (kilogram):
- 1lb: 28.35g
- 1 oz: 0.45 kg
- 1 stone: 6.35
Length, l (metre):
- 1 in: 2.54cm
- 1 ft: 30.48cm
- yd: 0.9144m
- mi: 1.61km
6
Q
What are Dimensional Quantities?
A
Dimensionless quantities are quantities expressed solely by a number and have no units.
7
Q
What are some applications of dimensional analysis?
A
- One application of dimensional analysis is in checking whether an equation is physically meaningful by
ensuring that both sides of the equation have the same dimensions. - When both sides of an equation have the same dimensions, the equation is said to have dimensional homogeneity or be dimensionally homogeneous.
- Another application of dimensional analysis is to predict the form of an equation.
8
Q
What are the base units of these dimensions?
- Mass
- Length
- Time
- Temperature
- Electric Current
- Luminosity
A
- Mass: M
- Length: L
- Time: T
- Temperature: θ
- Electric Current: I
- Luminosity: J
9
Q
What are the dimensions of the derived quantities?
- Area (A)
- Volume (V)
- Speed (v)
- Acceleration (a)
A
- Area (A): L²
- Volume (V): L³
- Speed (v): L T⁻¹
- Acceleration (a): L T⁻²
