Reading 1.7

Question 1

In 1791, French scientists proposed a standard unit of length, which they called the _____ after Greek ___ which means ____

Answer 1

• meter (m)
• metron
• measure

Question 2

French scientists is 1791 based the length of the meter on ____ of the distance along an imaginary line running from the ___ to the ____

Answer 2

• 1/10,000,000
• North Pole
• equator

Question 3

In addition to the meter the French scientists also settled on a _____ for designing lengths that are multiples or fractions of a meter

Answer 3

-decimal-based system

Question 4

a set of based and derived units used worldwide to express distances and quanities of matter and energy

Answer 4

SI units

Question 5

The SI unit for energy

Answer 5

joule (J)

- 1 kg *(m/s)^2

Question 6

SI unit for speed

Answer 6

m/s

Question 7

kinetic energy equation

Answer 7

KE=1/2mu^2
-when mass (m) is expressed in kilograms and speed (u) is in meters per second, the units of KE are kg ∙ (m/s)2, or joules.

Question 8

which Si unit is 10^21

Answer 8

zetta (Z)

Question 9

Which Si Unit is 10^18

Answer 9

exa (E)

Question 10

Which Si Unit is is 10^15

Answer 10

peta (P)

Question 11

Which Si Unit is 10^12

Answer 11

tera (T)

Question 12

Which Si Unit is is 10^9

Answer 12

Giga (G)

Question 13

Which SI Unit is 10^6

Answer 13

mega (M)

Question 14

Which Si Unit is 10^3

Answer 14

kilo (k)

Question 15

Which Si Unit is is 10^2

Answer 15

hecto (h)

Question 16

Which Si Unit is is 10^1

Answer 16

deka (da)

Question 17

Which SI unit is deci (d)

Answer 17

10^-1

Question 18

Which Si Unit is 10^-3

Answer 18

milli (m)

Question 19

Which Si Unit is 10^-6

Answer 19

micro µ

Question 20

Which SI unit is 10^-9

Answer 20

nano (n)

Question 21

Which SI unit is 10^-12

Answer 21

pico (p)

Question 22

WHich SI unit is 10^-15

Answer 22

femto (f)

Question 23

Which SI Unit is 10^-18

Answer 23

atto (a)

Question 24

Which SI Unit is 10^-21

Answer 24

zepto (z)

Question 25

Si base unit for mass

Answer 25

kg

Question 26

Si base unit for length

Answer 26

m

Question 27

Si base unit for temperature

Answer 27

kelvin K

Question 28

Si base unit for time

Answer 28

second s

Question 29

Si base unit for electric current

Answer 29

ampere (A)

Question 30

Si base unit for quantity of a substance

Answer 30

mole mol

Question 31

100 C =. __ F and ___ K. This is the _____ point of H20

Answer 31

• 212
• 373
• boiling point

Question 32

0 C= __ F & __ K. This is the ___ point of ice

Answer 32

• 32
• 273
• melting

Question 33

78 C = __ F & ___ K. This is the ___ point of ____

Answer 33

• 108
• 195
• sublimation point of dry ice (solid CO2)

Question 34

-273 C=___ F= ____ K

Answer 34

• 459
• 0
• Absolute 0

Question 35

the lowest temperature possible

Answer 35

0 K

Question 36

Equation F to C

Answer 36

• F=180/100C+32

- reduced=9/5C+32

Question 37

COnvert C to K

Answer 37

273.15+ C

Question 38

___ cm= 1 in

Answer 38

2.54

Question 39

1 L= ___ decimeter

Answer 39

1 cubic decimeter ( a cube 1/10 meter on a side)

Question 40

Which statistics associated with the Golden Gate Bridge in San Francisco, CA (Figure 1.20), are exact numbers, and which have some inherent uncertainty?
a The roadway is six lanes wide.
b The bridge is 27.4 m wide.
c The bridge has a mass of 381 million kg.
d The bridge is 2740 m long.
e The “FasTrack” toll for a car traveling south is $7.00 (as of July 1, 2018).

Answer 40

exact: a e
uncertainty: b, c, d

Question 41

the extent to which repeated measurements of the same variable agree

Answer 41

precision

• make multiple measurements and record, if the results are consistent with one another, the balance is precise
• cite range between highest and lowest values or the # +- #

Question 42

agreement between an experimentally measured value and the true value
-how close a measurement is to its true value

Answer 42

accuracy

Question 43

all the certain digits in a measured value plus one estimated digit. The greater the number of sig figs the greater the certainty with which the value is known

Answer 43

significant figures

Question 44

Zeros after a decimal point and after a nonzero digit, as in 3.00 ✕ 108 are significant or no

Answer 44

yes

Question 45

Are Zeros at the end of a value that contains no decimal point, as in 96,500 significant?

Answer 45

may or may not be

• we need to use scientific notation to indicate whether those terminal zeros are significant
• if those zeros are not significant and serve only to set the decimal point, the value in scientific notation is 9.65 ✕ 10^4
• so 3 sig figs

Question 46

According to the rules of golf, a golf ball cannot weigh more than 45.97 g, and it must be at least 4.267 cm in diameter. The volume of a sphere is (4/3)πr3, where r is the radius (half the diameter).
a. What is the max density of a golf ball, expressed in grams per cubic centimeter to the appropriate # of sig figs

Answer 46

1.130 g/cm3

Question 47

In the summer of 2018, Belgan dentist Karl Sabbe set a record by hiking the Appalachian Trail from its southern terminus at Springer Mountain Gerorgia to its northern terminus on the peak of Mt. Katahdin, Maine in 45 days, 7 hrs, 39 min. His hike was 3523 km (2189 miles) long

a. What was Sabbe’s average speed in kilometers per day and miles per day?
b. Which do you think is the weak link in calculating his average speed: the actual distance hiked or the time that it took

Answer 47

a. 77.74 km/day or 48.30 miles/day
b. the trip took 65,259 min which is known to 5 sig figs; one more than the distance hiked (3523 km) Therefore, distance is the weak link