Units! Units! Units!

Question 1

Hertz

Answer 1

1 Hz= 1/s or s^-1, it measures frequency

Question 2

Newton

Answer 2

1 N = kg*m/s^2, it measures force

Question 3

Pascal

Answer 3

Pa= 1 N/m^2, it measures pressure

Question 4

Joule

Answer 4

J= N*m, it measures Energy, work, or heat

Question 5

Watt

Answer 5

W= J/s, this measures power

Question 6

Coulomb

Answer 6

C= A*s, or A=C/s, this measures electric charge

Question 7

Volt

Answer 7

V= J/C, this measures electric potential

Question 8

Farad

Answer 8

F=C/V, this measures capacitance

Question 9

Ohm

Answer 9

Omega= V/A, Electrical resistance

Question 10

Tesla

Answer 10

T= N/A*m, this measures magnetic field

Question 11

Celcius

Answer 11

K-273

Question 12

Ampere

Answer 12

A= C/s, this measures current

Question 13

In metric units, how much is a mile?

Answer 13

1.6 km

Question 14

In metric units, how much is a foot?

Answer 14

30 cm

Question 15

In metric units, how much is a pound?

Answer 15

4.5 N

Question 16

In metric units, how much is a gallon?

Answer 16

4 L

Question 17

In metric units, how much is a calorie?

Answer 17

4000 J or 1 kcal

Question 18

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?

Answer 18

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

Question 19

Is temp vector or scalar?

Answer 19

Scalar

Question 20

Is speed vector or scalar?

Answer 20

Scalar

Question 21

Are decibels vector or scalar?

Answer 21

Scalar

Question 22

What is the difference between distance and displacement?

Answer 22

Distance is scalar, displacement is vector

Question 23

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.)

Answer 23

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.

Question 24

In the graph above, the shaded area represents:

Answer 24

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)

Question 25

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.

Answer 25

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

Question 26

tera

Answer 26

T, 12

Question 27

giga

Answer 27

G, 9

Question 28

mega

Answer 28

M, 6

Question 29

kilo

Answer 29

k, 3

Question 30

hecto

Answer 30

h, 2

Question 31

deka

Answer 31

da, 1

Question 32

deci

Answer 32

d, -1

Question 33

centi

Answer 33

c, -2

Question 34

milli

Answer 34

c, -3

Question 35

micro

Answer 35

mu, -6

Question 36

nano

Answer 36

n, -9

Question 37

angstrom

Answer 37

A with a dot on top, -10

Question 38

pico

Answer 38

p, -12, Dont get this messed up with peta which is P and 15

Question 39

What is the SI base unit for tempurature?

Answer 39

Kelvin

Question 40

What is the SI base unit for mass?

Question 41

What is the SI base unit for distance?

Answer 41

meters

Question 42

What is the SI base unit for current?

Answer 42

amps

Question 43

Electric Feild

Answer 43

Newtons/ Coulumb or Volts /m