physics 30 assignment 1

Physics 30 Resources

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Physics 30 2011 Released Items

Physics 30 2012 Released Items

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Unit A - Momentum

1D Collisions

2D Collisions

Unit B - Electricity and Magnetism

Electric Forces and Fields

Intro To Electricity

Coulombs Law

Coulomb’s Law In 2D

Curve Straightening

Electric Field

Uniform Electric Fields

Charged Particles In Electric Fields

Magnetic Forces and Fields

Electricity And Magnetism

Third Left Hand Rule

Applications Of Particle Deflection

The Electric Motor

Unit C - Electromagnetic Radiation

Speed Of Light

Diffraction And Polarization

Quantum Physics

Photoelectric Effect

The Compton Effect

De Broglie Matter Waves

Unit D - Atomic Physics

Early Atomic Models

Rutherford Model

Mass Defect

Nuclear Decay

Nuclear Reactions

Discovering Particles

Subatomic Particles

De Broglie Revisited

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Physics 30 Workbook

If you wish to have a fill-in-the-blank workbook for this course, you can download and print the resource below.

The homework questions are often different than the ones in the homework packages, and so you will need to use the solution booklet provided below as well.

The following notes cover the entire Physics 30 curriculum ( 2007 version ). I don’t intend that my students use these notes as an excuse to skip class… in fact I’ve put them here for the exact opposite reason. If you already have these notes when you come to class, you’ll find it easier to follow my explanations as I go through them. You are not required to access these notes… you are not missing anything if you completely ignore this web site. 

All of the chapters listed here are based on the order of the Pearson Physics textbook. At the bottom of each page you will find a note telling you what section from the text book the notes correspond to.

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• Resource Library
• Conversions
• Graphical Notation
• Projectile Motion
• Relative Motion
• Scientific Notaion
• Significant Figures

Unit 0 - Lesson 0.1 - The Basic Skills - Marked Up

Unit 0 - lesson 0.1 - the basic skills, unit 1 - lesson 1.1 - graphical addition of vectors worksheet key, unit 1 - lesson 1.1 - graphical addition of vectors worksheet, unit 1 - lesson 1.1 - vector component method worksheet key, unit 1 - lesson 1.1 - vector component method worksheet, unit 1 - lesson 1.1 - vectors and vector addition - marked up, unit 1 - lesson 1.1 - vectors and vector addition, unit 1 - lesson 1.2 - dva - marked up, unit 1 - lesson 1.2 - dva worksheet key, unit 1 - lesson 1.2 - dva worksheet, unit 1 - lesson 1.2 - dva, unit 1 - lesson 1.3 - d-t and v-t graph worksheet key, unit 1 - lesson 1.3 - d-t and v-t graph worksheet, unit 1 - lesson 1.3 - d-t and v-t graphs - marked up, unit 1 - lesson 1.3 - d-t and v-t graphs, unit 1 - lesson 1.4 - kinematics equations worksheet, unit 1 - lesson 1.4 - kinematics practice problems key part 1, unit 1 - lesson 1.4 - kinematics practice problems key part 2, unit 1 - lesson 1.4 - the kinematics equations - marked up, unit 1 - lesson 1.4 - the kinematics equations, unit 1 - lesson 1.5 - projectile motion - marked up, unit 1 - lesson 1.5 - projectile motion worksheet key, unit 1 - lesson 1.5 - projectile motion worksheet, unit 1 - lesson 1.5 - projectile motion, unit 1 - lesson 1.6 - relative motion - marked up, unit 1 - lesson 1.6 - relative motion worksheet key, unit 1 - lesson 1.6 - relative motion worksheet, unit 1 - lesson 1.6 - relative motion, physics 30 - unit 1.

A compilation of lesson plans, worksheets and answer keys covering Unit 1 of Physics 30.

Problems & Exercises

1.2 physical quantities and units.

The speed limit on some interstate highways is roughly 100 km/h. (a) What is this in meters per second? (b) How many miles per hour is this?

A car is traveling at a speed of 33 m/s 33 m/s size 12{"33"" m/s"} {} . (a) What is its speed in kilometers per hour? (b) Is it exceeding the 90 km/h 90 km/h size 12{"90"" km/h"} {} speed limit?

Show that 1 . 0 m/s = 3 . 6 km/h 1 . 0 m/s = 3 . 6 km/h size 12{1 "." 0`"m/s"=3 "." "6 km/h"} {} . Hint: Show the explicit steps involved in converting 1 . 0 m/s = 3 . 6 km/h. 1 . 0 m/s = 3 . 6 km/h. size 12{1 "." 0`"m/s"=3 "." "6 km/h"} {}

American football is played on a 100-yd-long field, excluding the end zones. How long is the field in meters? (Assume that 1 meter equals 3.281 feet.)

Soccer fields vary in size. A large soccer field is 115 m long and 85 m wide. What are its dimensions in feet and inches? (Assume that 1 meter equals 3.281 feet.)

What is the height in meters of a person who is 6 ft 1.0 in. tall? (Assume that 1 meter equals 39.37 in.)

Mount Everest, at 29,028 feet, is the tallest mountain on the Earth. What is its height in kilometers? (Assume that 1 kilometer equals 3,281 feet.)

The speed of sound is measured to be 342 m/s 342 m/s size 12{"342"" m/s"} {} on a certain day. What is this in km/h?

Tectonic plates are large segments of the Earth’s crust that move slowly. Suppose that one such plate has an average speed of 4.0 cm/year. (a) What distance does it move in 1 s at this speed? (b) What is its speed in kilometers per million years?

(a) Refer to Table 1.3 to determine the average distance between the Earth and the Sun. Then calculate the average speed of the Earth in its orbit in kilometers per second. (b) What is this in meters per second?

1.3 Accuracy, Precision, and Significant Figures

Express your answers to problems in this section to the correct number of significant figures and proper units.

Suppose that your bathroom scale reads your mass as 65 kg with a 3% uncertainty. What is the uncertainty in your mass (in kilograms)?

A good-quality measuring tape can be off by 0.50 cm over a distance of 20 m. What is its percent uncertainty?

(a) A car speedometer has a 5.0 % 5.0 % size 12{5.0%} {} uncertainty. What is the range of possible speeds when it reads 90 km/h 90 km/h size 12{"90"" km/h"} {} ? (b) Convert this range to miles per hour. 1 km = 0.6214 mi 1 km = 0.6214 mi size 12{"1 km" "=" "0.6214 mi"} {}

An infant’s pulse rate is measured to be 130 ± 5 130 ± 5 size 12{"130" +- 5} {} beats/min. What is the percent uncertainty in this measurement?

(a) Suppose that a person has an average heart rate of 72.0 beats/min. How many beats does he or she have in 2.0 y? (b) In 2.00 y? (c) In 2.000 y?

A can contains 375 mL of soda. How much is left after 308 mL is removed?

State how many significant figures are proper in the results of the following calculations: (a) 106 . 7 98 . 2 / 46 . 210 1 . 01 106 . 7 98 . 2 / 46 . 210 1 . 01 size 12{ left ("106" "." 7 right ) left ("98" "." 2 right )/ left ("46" "." "210" right ) left (1 "." "01" right )} {} (b) 18 . 7 2 18 . 7 2 size 12{ left ("18" "." 7 right ) rSup { size 8{2} } } {} (c) 1 . 60 × 10 − 19 3712 1 . 60 × 10 − 19 3712 size 12{ left (1 "." "60" times "10" rSup { size 8{ - "19"} } right ) left ("3712" right )} {} .

(a) How many significant figures are in the numbers 99 and 100? (b) If the uncertainty in each number is 1, what is the percent uncertainty in each? (c) Which is a more meaningful way to express the accuracy of these two numbers, significant figures or percent uncertainties?

(a) If your speedometer has an uncertainty of 2 . 0 km/h 2 . 0 km/h size 12{2 "." 0" km/h"} {} at a speed of 90 km/h 90 km/h size 12{"90"" km/h"} {} , what is the percent uncertainty? (b) If it has the same percent uncertainty when it reads 60 km/h 60 km/h size 12{"60"" km/h"} {} , what is the range of speeds you could be going?

(a) A person’s blood pressure is measured to be 120 ± 2 mm Hg 120 ± 2 mm Hg size 12{"120" +- 2" mm Hg"} {} . What is its percent uncertainty? (b) Assuming the same percent uncertainty, what is the uncertainty in a blood pressure measurement of 80 mm Hg 80 mm Hg size 12{"80"" mm Hg"} {} ?

A person measures his or her heart rate by counting the number of beats in 30 s 30 s size 12{"30"" s"} {} . If 40 ± 1 40 ± 1 size 12{"40" +- 1} {} beats are counted in 30 . 0 ± 0 . 5 s 30 . 0 ± 0 . 5 s size 12{"30" "." 0 +- 0 "." 5" s"} {} , what is the heart rate and its uncertainty in beats per minute?

What is the area of a circle 3 . 102 cm 3 . 102 cm size 12{3 "." "102"" cm"} {} in diameter?

If a marathon runner averages 9.5 mi/h, how long does it take him or her to run a 26.22-mi marathon?

A marathon runner completes a 42 . 188 -km 42 . 188 -km size 12{"42" "." "188""-km"} {} course in 2 h 2 h size 12{2" h"} {} , 30 min, and 12 s 12 s size 12{"12"" s"} {} . There is an uncertainty of 25 m 25 m size 12{"25"" m"} {} in the distance traveled and an uncertainty of 1 s in the elapsed time. (a) Calculate the percent uncertainty in the distance. (b) Calculate the uncertainty in the elapsed time. (c) What is the average speed in meters per second? (d) What is the uncertainty in the average speed?

The sides of a small rectangular box are measured to be 1 . 80 ± 0 . 01 cm 1 . 80 ± 0 . 01 cm size 12{1 "." "80" +- 0 "." "01"" cm"} {} , {} 2 . 05 ± 0 . 02 cm, and 3 . 1 ± 0 . 1 cm 2 . 05 ± 0 . 02 cm, and 3 . 1 ± 0 . 1 cm size 12{2 "." "05" +- 0 "." "02"" cm, and 3" "." 1 +- 0 "." "1 cm"} {} long. Calculate its volume and uncertainty in cubic centimeters.

When non-metric units were used in the United Kingdom, a unit of mass called the pound-mass (lbm) was employed, where 1 lbm = 0 . 4539 kg 1 lbm = 0 . 4539 kg size 12{1" lbm"=0 "." "4539"`"kg"} {} . (a) If there is an uncertainty of 0 . 0001 kg 0 . 0001 kg size 12{0 "." "0001"`"kg"} {} in the pound-mass unit, what is its percent uncertainty? (b) Based on that percent uncertainty, what mass in pound-mass has an uncertainty of 1 kg when converted to kilograms?

The length and width of a rectangular room are measured to be 3 . 955 ± 0 . 005 m 3 . 955 ± 0 . 005 m size 12{3 "." "955" +- 0 "." "005"" m"} {} and 3 . 050 ± 0 . 005 m 3 . 050 ± 0 . 005 m size 12{3 "." "050" +- 0 "." "005"" m"} {} . Calculate the area of the room and its uncertainty in square meters.

A car engine moves a piston with a circular cross section of 7 . 500 ± 0 . 002 cm 7 . 500 ± 0 . 002 cm size 12{7 "." "500" +- 0 "." "002"`"cm"} {} diameter a distance of 3 . 250 ± 0 . 001 cm 3 . 250 ± 0 . 001 cm size 12{3 "." "250" +- 0 "." "001"`"cm"} {} to compress the gas in the cylinder. (a) By what amount is the gas decreased in volume in cubic centimeters? (b) Find the uncertainty in this volume.

1.4 Approximation

How many heartbeats are there in a lifetime?

A generation is about one-third of a lifetime. Approximately how many generations have passed since the year 0 AD?

How many times longer than the mean life of an extremely unstable atomic nucleus is the lifetime of a human? (Hint: The lifetime of an unstable atomic nucleus is on the order of 10 − 22  s 10 − 22  s size 12{"10" rSup { size 8{ - "22"} } " s"} {} .)

Calculate the approximate number of atoms in a bacterium. Assume that the average mass of an atom in the bacterium is ten times the mass of a hydrogen atom. (Hint: The mass of a hydrogen atom is on the order of 10 − 27  kg 10 − 27  kg size 12{"10" rSup { size 8{ - "27"} } " kg"} {} and the mass of a bacterium is on the order of 10 − 15  kg. 10 − 15  kg. size 12{"10" rSup { size 8{ - "15"} } "kg"} {} )

Approximately how many atoms thick is a cell membrane, assuming all atoms there average about twice the size of a hydrogen atom?

(a) What fraction of Earth’s diameter is the greatest ocean depth? (b) The greatest mountain height?

(a) Calculate the number of cells in a hummingbird assuming the mass of an average cell is ten times the mass of a bacterium. (b) Making the same assumption, how many cells are there in a human?

Assuming one nerve impulse must end before another can begin, what is the maximum firing rate of a nerve in impulses per second?

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Physics archive

Unit 1: one-dimensional motion, unit 2: two-dimensional motion, unit 3: forces and newton's laws of motion, unit 4: centripetal force and gravitation, unit 5: work and energy, unit 6: impacts and linear momentum, unit 7: torque and angular momentum, unit 8: oscillations and mechanical waves, unit 9: fluids, unit 10: discoveries and projects, unit 11: review for ap physics 1 exam.

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Milwaukee Brewers' Electric Rookie Joins Rare Baseball History with Grand Slam

Brady farkas | jun 29, 2024.

• Milwaukee Brewers

The Milwaukee Brewers beat the division-rival Chicago Cubs on Friday night by a score of 4-2. In the win, Brewers' rookie Jackson Chourio electrified the crowd with a grand slam, which was the only scoring Milwaukee did all night. The blast came in the fourth inning off of veteran righty Jameson Taillon.

Chourio, who entered the season as the No. 2 prospect in all of baseball, made some unique history and did something not done in more than 20 years.

Per Sarah Langs of MLB.com:

at 20 years & 109 days old, Jackson Chourio is the 10th-youngest player with a grand slam since 1900, older than only: 6/3/1964 Tony Conigliaro: 19y 148d 6/11/1954 Al Kaline: 19y 174d 8/22/1912 Eddie Onslow: 19y 187d 4/18/1958 Vada Pinson: 19y 250d 5/16/1936 Phil Cavarretta: 19y 302d 6/21/1956 Harmon Killebrew: 19y 358d 6/15/2003 José Reyes: 20y 4d 6/22/1915 Jimmy Smith: 20y 38d 7/15/1938 Bobby Doerr: 20y 99d h/t @EliasSports

at 20 years & 109 days old, Jackson Chourio is the 10th-youngest player with a grand slam since 1900, older than only: 6/3/1964 Tony Conigliaro: 19y 148d 6/11/1954 Al Kaline: 19y 174d 8/22/1912 Eddie Onslow: 19y 187d 4/18/1958 Vada Pinson: 19y 250d 5/16/1936 Phil Cavarretta: 19y… https://t.co/tJysp8eYUN — Sarah Langs (@SlangsOnSports) June 29, 2024

After struggling at the beginning of the year, the 20-year-old is starting to find his footing in the big leagues. His average is up to .241 and he's got nine homers, 32 RBI and eight stolen bases. He's now posting a .676 OPS and is an everyday player for the Brewers, who currently lead the National League Central.

This was the second time this week he made history, having previously done it while hitting an inside-the-park home run.

The Brewers and Cubs will do battle again on Saturday afternoon with first pitch set for 4:10 p.m. ET.

Left-hander Justin Steele will pitch for the Cubs against righty Tobias Myers for Milwaukee. Steele is 0-3 with a 3.08 ERA while Myers is 5-2 with a 3.12.

The Cubs are currently in last place in the division.

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BRADY FARKAS

Brady Farkas is a baseball writer for Fastball on Sports Illustrated/FanNation and the host of 'The Payoff Pitch' podcast which can be found on Apple Podcasts and Spotify. Videos on baseball also posted to YouTube. Brady has spent nearly a decade in sports talk radio and is a graduate of Oswego State University. You can follow him on Twitter @WDEVRadioBrady.