Math Formulas

Question 1

Volume of a cylinder

Answer 1

V= Pi r^2

Question 2

Volume of a box or room

Answer 2

V=L x W x H

Question 3

Probability

Answer 3

Prob.= #Wanted Outcomes / # Possible Outcomes

Question 4

Probability of multiple possibilities (Probability of rolling a 1 and a 4 on a dice)

Answer 4

Calculate probability for each and add the two probabilities together.
1/6 + 1/6 - 2/6 - 1/3 or .3333

Question 5

Radioactive Stay Time Formula

Answer 5

Stay Time = dose (mrem) / dose rate (mrem/hr)
Answer is in hours - Multiply by 60 to get minutes
mrem = A unit of radiation dose equivalent to one-thousandth of a rem

Question 6

Convert rem to mrem (milirem)

Answer 6

rem value x 1000

Question 7

Momentum Formula

Answer 7

P=m x v
P = Momentum (kg/m/s)
m = mass (kg)
v = velocity (m/s)

Question 8

Calculating Work in Joules Formula

Answer 8

W = f x d
w = work (joules)
f = force (newtons)
d = distance (meters)

Question 9

Noise Reduction Rating - NRR

Answer 9

Noise Reduction Level = Noise Level - ((NRR - 7) / 2)

Question 10

Velocity Pressure Formula

Answer 10

VP = (V/4005)^2
Answer in Inches Water Gauge or in. w.g.

Question 11

Air Change Per Hour (ACH) Formula

Answer 11

ACH = (Q x 60 min)/Volume of Room

Question 12

Time Weighted Average TWA Formula

Answer 12

TWA = ((c1 x T1) + (cN x tN)) / (t1 + tN)
c = concentration
t = time

Question 13

pH of a Solution

Answer 13

pH = -log[H+]
H = Hydrogen Molarity

Question 14

Convert mL to L

Answer 14

mL / 1000
mL = milliliters
L = 1000

Question 15

Concentration of a solution

Answer 15

% Volume = ((volume of solute) / (volume of solution)) / 100

Question 16

Radioactive Decay Formula

Answer 16

N(t) = N0 ^(t/tt)
N(t) = remaining mass
N0 = Original Mass
t = Time Interval
tt = 1/2 life of substance

Question 17

Standard Deviation

Answer 17

All data entered into calculator

Question 18

Convert from a larger unit to a smaller unit

Answer 18

Multiply. Move the decimal point to the right.