CVT 100 #1 Math basics

Question 1

The goal of physics:

Answer 1

explain physical phenomena in terms of mathematical formulas.

Question 2

Good science is based on precise measurements.Good measurement has come to constitute its own branch of science:

Answer 2

metrology.

Question 3

Three measurement systems:

Answer 3

1. System International (SI)
2. Centimeter-Gram-Second (CGS)
3. The British System

Question 4

The seven basic S.I. units:

Answer 4

*Length meter m
*Mass kilogram kg
*Time second s
*Electric current ampere A
*Thermodynamic kelvin K
temperature
*Amount of substance mole mol
*Luminous intensity candela cd

Question 5

Calibration:

Answer 5

the act of checking or adjusting the accuracy of a measuring instrument by comparison with a standard.

Question 6

Meter:

Answer 6

distance traveled by light in a vacuum in 1/299,792,458 of a second

Question 7

Kilogram:

Answer 7

THE KILOGRAM is a 2-inch platinum-irridium alloy cylinder just outside Paris (the French revolution…)

Question 8

Second:

Answer 8

duration of 9,192,631,770 periods of radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom.

Question 9

Ampere:

Answer 9

that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 x 10-7 newton per metre of length.

Question 10

Metric conversions
Liters to milliliters:
Milliliters to liters:

Answer 10

Liters to milliliters:
Multiply the number by 1000

Milliliters to liters:
Divide the number by 1000

Question 11

If you make the units bigger,

If you make the units smaller,

Answer 11

the number itself must get smaller.

the number itself must get bigger.

Question 12

Converting to and from milliwhatevers
Millimeters to meters:
Meters to millimeters:

Answer 12

Millimeters to meters:
move the decimal 3 places to the LEFT.
(This makes the number smaller.)

Meters to millimeters:
move the decimal 3 places to the RIGHT.
(This makes the number bigger.)

Question 13

For most things, 
to avoid getting tangled in decimal trouble,
convert to whole units
(meters, liters, hertz, etc.)
then calculate.
Then convert back if appropriate.

Answer 13

a

Question 14

For millimeters to meters, the units get a thousand times bigger, so the number gets a thousand times smaller.Which way does the decimal move?

Answer 14

75mm = 0.075 m

Question 15

Centiwhatevers
Meters to centimeters:
Centimeters to meters:

Answer 15

Meters to centimeters:
Move the decimal 2 places to the right.
0.50 m = 50 cm

Centimeters to meters:
Move the decimal 2 places to the left.
100 cm = 1.0 m

Question 16

Cardiac output (CO):       
Cardiac index (CI):    

Stroke volume:
Stroke volume index:
Blood velocity:

Answer 16

Cardiac output (CO)        L/min
Cardiac index (CI)           L/min/m2 
                (BSA in square meters)

Stroke volume mL/beat
Stroke volume index mL/beat/m2
Blood velocity m/sec or cm/sec

Question 17

Scientific notation
So rewrite the numbers as powers of ten.

50,000,000
0.00002
200,000,000,000

Answer 17

50,000,000 = 5 x 107

0.00002 = 2 x 10-5

200,000,000,000 = 2 x 1011

The format is alwaysX.XXX x 10x

Question 18

Poiseuille’s law

Answer 18

P1 - P2
8 L h
π r 4