Units! Units! Units! Flashcards
Hertz
1 Hz= 1/s or s^-1, it measures frequency
Newton
1 N = kg*m/s^2, it measures force
Pascal
Pa= 1 N/m^2, it measures pressure
Joule
J= N*m, it measures Energy, work, or heat
Watt
W= J/s, this measures power
Coulomb
C= A*s, or A=C/s, this measures electric charge
Volt
V= J/C, this measures electric potential
Farad
F=C/V, this measures capacitance
Ohm
Omega= V/A, Electrical resistance
Tesla
T= N/A*m, this measures magnetic field
Celcius
K-273
Ampere
A= C/s, this measures current
In metric units, how much is a mile?
1.6 km
In metric units, how much is a foot?
30 cm
In metric units, how much is a pound?
4.5 N
In metric units, how much is a gallon?
4 L
In metric units, how much is a calorie?
4000 J or 1 kcal
Some of the world’s fastest long distance runners can complete a marathon race in 7.56 x 103 seconds. Which of the following is an equivalent value in microseconds?
To convert between seconds and microseconds, we simply multiply seconds by 1 x 106: (7.56 x 103 s) x (106) = 7.56 x 109 μs
Is temp vector or scalar?
Scalar
Is speed vector or scalar?
Scalar
Are decibels vector or scalar?
Scalar
What is the difference between distance and displacement?
Distance is scalar, displacement is vector
A multi-destination commercial jet leaves Vancouver at 60° SE towards Phoenix. After a quick stop in Phoenix, the jet travels 60° NE for 5 Mm to Queens. Which value provides the total vertical displacement from Vancouver to Phoenix, if Queens is 3000 km south of Vancouver? (Note: Positive values denotes displacement in the N/E directions, and negative values in the S/W directions.)
Using SOH from SOH-CAH-TOA, we can determine y2 from sin(60o) = y2 / 5 Mm 0.866 * 5 Mm = 4.33 Mm Thus, y2 is approximately equivalent to 4 Mm. A megameter (Mm) is equivalent to 1000 kilometers (km). Thus, 4 Mm is also equivalent to 4000 km. As the question stem asks about the vertical displacement from Vancouver to Phoenix, y1, the calculation involves adding the vertical displacement of y2 and the distance from Vancouver to Queens, 3000 km. Though displacement and distance are vector and scalar quantities, respectively, the distance from Vancouver to Queens can be expressed with direction as 3000 km south, thereby making both values vector quantities that can be additive: y1 = y2 + 3000 km = 4000 km + 3000 km = 7000 km or 7 Mm Since south is denoted by a negative value, the vertical displacement from Vancouver to Phoenix would be expressed as -7 Mm.
In the graph above, the shaded area represents:
Displacement. Recall that the units under the area of the curve represent the units of X times the units of Y. So, velocity and time would be (m/s)*(s)
Place the following scenarios in order of decreasing distances: a horse galloping 5 x 109 μm, a rabbit hopping 50 x 1012 pm, a lioness running 50 x 10-6 Gm, and a cheetah sprinting 500 x 10-3 km.
The correct order is a lioness running 50 x 10-6 Gm, then a horse galloping 5 x 109 μm, then a cheetah sprinting 500 x 10-3 km, then a rabbit hopping 50 x 1012 pm.
50 x 10-6 Gm = 50,000 m
5 x 109 μm = 5,000 m
500 x 10-3 km = 500 m
50 x 1012 pm = 50 m
tera
T, 12
giga
G, 9
mega
M, 6
kilo
k, 3
hecto
h, 2
deka
da, 1
deci
d, -1
centi
c, -2
milli
c, -3
micro
mu, -6
nano
n, -9
angstrom
A with a dot on top, -10
pico
p, -12, Dont get this messed up with peta which is P and 15
What is the SI base unit for tempurature?
Kelvin
What is the SI base unit for mass?
What is the SI base unit for distance?
meters
What is the SI base unit for current?
amps
Electric Feild
Newtons/ Coulumb or Volts /m
