Activity 20.1.1a. = c3*$c$4b. = c8*$c$9*c10/c11c. = c14*c16 + 0.5*$c$15*c16^2d. = sum(c19:c21)e. = 10*log(c25/c26)f. =average(c30:c32)

Activity 20.1.21. The fastest human is 2200 times faster than the average snail.2. the fastest human can run 0.029 times the speed of sound.

Activity 20.1.3

Activity 20.1.4Company X produces equivalent of 144150 kg of CO2Company Y produces equivalent of 852450 kg of CO2

So, Company Y contributes more to global warming.

Activity 20.3.1 Matching stories with graphs1. c2. d3. c4. a

Activity 20.3.2 Creating stories for graphs1. runner A: starts slow, accelerates, then maintains an almost constant, fast speed

till he crosses the finish line. He wins.

2. runner B: starts off fast, keeps up the speed for quite a while, then suddenly slows down and stops before he reaches the finish line. Maybe he hurt himself?

3. runner C: starts off at a medium speed, keeps it up for a while, but when not quite half way to the finish line stops (he had to tie his shoelace?) then starts up again, sprinting fast to the finish line. Comes in 2nd.

4. runner D: starts off slow. Goes a short way, then decides that running is for the birds, and returns to the start line.

5. day E: the child adds a bucket of water to the pool, then removes it. Repeats.6. day F: there is a tiny hole in the pool, the level of water in the pool gradually

decreases throughout the day.7. day G: the pool is filled with a steady stream of water from a hose. Then 3 extra

buckets of water are added. Then a large bucket of water (equal in volume to the 3 smaller buckets) is removed.

8. day H: pool is filled with a steady stream from a hose. Then an extra bucket of water is added. Then the plug is pulled and the water is allowed to drain out.

Activity 20.3.3: How can I draw this on Word?

Activity 20.4.1 part (i) Ozone pollution shows similar daily fluctuations at all locations, but it is worst in the valley.

Activity 20.4.1. part (ii) where can I find hourly Air quality data for LA?

Activity 20.4.1. part (iii) humans are way above the average in terms of brain weight:body weight.

Activity 20.4.1 part (iv) : main sequence runs from top left to bottom right. Our Sun is on the main sequence.

Activity 20.4.1 part (v): sunspot cycle has period of about 11 years. Sunspot number varies from close to 0 at solar minimum, to between 100 and 160 at sunspot max.

Activity 20.4.2 part (i) Boiling point is a periodic property. Noble gases have the lowest boiling point. Carbon family has the highest.

Activity 20.4.2 part (ii) : melting point is a periodic property. Noble gases have the lowest melting point. Carbon family has the highest.

Activity 20.4.2 part (iii) : atomic mass is not a periodic property.

Activity 20.4.2 part (iv) ionization energy is a periodic property. Noble gases have the highest ionization energy. Alkali metals have the lowest.

Activity 20.4.2 part (v) Electron affinity is a periodic property. The alkaline earth family has the lowest electron affinity and the halogens have the highest.

Activity 20.5.1: part (ii) Wolf repopulation in Yellowstone.In 1995 all the wolves were in the northern range. With time, they spread out and since 1997 only half the wolves are found in the northern range.

Activity 20.5.2 :

Activity 20.5.3:

Activity 20.5.4: Where do I find data for oceans?

Activity 20.5.5:

Activity 20.6.1 (1) : Leading Causes of Death, 2001.

In Developing countries most people die from infectious diseases. In developed countries most people die from heart disease and stroke, results of a rich diet.

Activity 20.6.1 (3) Percentage of energy from renewable sources (Hydroelectric, biomass, geothermal, solar, wind)=7.4 %

Activity 20.6.2 Area graphs : Illustrating the magnitude of change over time

Activity 20.6.2 (1) Seed Germination

Activity 20.6.2 (2) Commercial Satellite launches

Activity 20.7.1: Plotting High-Low (Stock) Graphs to show means and ranges of data

Activity 20.7.2: Combination Graphs – Plotting 2 types of data on one chart(3) From the graph below, Dallas has a hot, humid summer in July/August and is mildly cold in winter. It gets a moderate amount of rainfall year-round, spring is especially rainy, though.

(4) Species Diversity and biomass decrease together as elevation increases

Activity 20.7.3 Log plots – Plotting a wide range of data(1) Do radioactive elements decay in an exponential manner?Here is a linear plot of mass of a sample of strontium vs time

Here is a semi-log plot of mass of a sample of strontium-90 vs time

The semi-log plot is a straight line, indicating that the mass of strontium-90 is an exponential function of time. The trendline is y=100e-0.0277tmeaning that there was initially 100gThe amount of strontium remaining will be 1/e (about 0.37) of the initial amount in 1/0.0277 = 36 years.

Activity 20.8.1 Descrptive statistics – Making sense of the dataNumber of "unhealthy air" days / year

Atla

nta

GA

Bak

ersf

ield

CA

Bal

timor

e M

D

Bos

ton

MA

Buf

falo

NY

Cha

rlotte

NC

Chi

cago

IL

Cle

vela

nd O

H

Dal

las

TX

Det

roit

MI

Fres

no C

A

Hou

ston

TX

Indi

anap

olis

IN

Kno

xvill

e TN

Los

Ang

eles

CA

Mem

phis

TN

Nas

hvill

e, T

N

New

Orle

ans

LA

New

Yor

k C

ity N

Y

Phi

lade

lphi

a P

A

Pho

enix

AZ

Riv

ersi

de C

A

Sac

ram

ento

CA

San

Ant

onio

TX

San

Die

go C

A

St.

Loui

s M

O-IL

Was

hing

ton

DC

# unhealthy days 61 88 40 5 8 34 12 18 23 15 81 50 21 59 27 36 33 18 24 32 12 93 38 9 16 29 39% unhealthy days 17 24 11 1 2 9 3 5 6 4 22 14 6 16 7 10 9 5 7 9 3 25 10 2 4 8 11

average # of unhealthy days for all cities: 34median # of unhealthy days for all cities: 29

city with greatest # of unhealhful days per year 93 (Riverside, CA)city with least # of unhealhful days per year 5 (Boston, MA)

Activity 20.8.2 Fitting trendlines to the data(1) Motion of a car – the best fit was a power law

(2) Pendulums best fit T~ sqrt(L)