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Iowa State | PHYSICS 221
Professors
- Johnson,
- Paul Canfield And Paula Herrera-siklody,
- Johnston,
- Attwood,
- Prell,
- Frishner
84 sample documents related to PHYSICS 221
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Iowa State PHYSICS 221
Formulas G = 6.67 1011 N m2 /kg2 g = 9.80 m/s2 constants Physics 221 k = R/NA = 1.381 1023 J/K R = 8.314 J/mol K = 0.08208 L atm/mol K c = 102 prexes m = 103 = 106 k = 103 conversions, units 1 rev = 2 rad 1 Pa = 1 N/m2 geometry math 1 W = 1 J/s 1 L atm = -
Iowa State PHYSICS 221
Welcome to Physics 221: Introduction to Classical Physics I Prof. David Johnston, Lecturer Lecture 1 Monday 22 August 2011 Please pick up the syllabus and the formula sheet from the front table. Carefully read the syllabus. Your TA will go over the syllab -
Iowa State PHYSICS 221
Ch. 20 Study Problem Solutions 20.1 A pot is half-filled with water, and a lid is placed on the pot, forming a tight seal so that no water vapor can escape. The pot is heated on a stove, forming water vapor inside the pot. The heat is then turned off and -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #1 Solutions Ch. 1 Due Tues, Sept 2, 2008 1.1 A car is moving along a highway with a speed of v = 60.0 miles/hour. (a) How many significant figures are present in the value of the speed? There are 3 significant figures. In t -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #3 Solutions Chs. 3 and 9:1-3 Due Tues, Sept 16, 2008 3.1 A particle has a position (x, y) in the x-y plane versus time t given by x = (0.100 m/s2)t2 y = (0.000500 m/s4)t4 (a) At t = 10.0 s, how far is the particle from the -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #4 Solutions Chs. 4 and 5:1,2 Due Tues, Sept 23, 2008 4.1 (a) State Newtons three laws of motion in words. What is an inertial reference frame and how is an inertial reference frame related to Newtons laws? 1st Law: A partic -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #5 Solutions Ch. 5:3,4, Ch. 6 Due Tues, Sept 30, 2008 5.1 A car of mass M is moving in a straight line at an initial speed of vi on a horizontal concrete highway. For rubber on dry concrete, the coefficient of static frictio -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #6 Solutions Ch. 7 Due Tues, Oct 7, 2008 6.1 Consider a 0.142 kg baseball near the Earths surface. The ball is thrown directly upward with an initial speed v0 from an initial height of 2.0 m. The ball reaches a height of 15. -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #7 Solutions Ch. 8 Due Tues, Oct 14, 2008 7.1 A 0.0100 kg particle is moving horizontally towards the negative x-axis at a speed of 3.00 m/s and collides with a vertical stationary wall in the y-z plane. The x-component of t -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #8 Solutions Ch. 9:4-6; Ch. 10:1-4 Due Tues, Oct 21, 2008 8.1 N identical point-like particles are equally spaced around the rim of a circular massless wheel of radius R. The total mass of all the particles is M. Derive the -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #9 Solutions Due Tues, Oct 28, 2008 Ch. 10:5,6; Ch. 11:1-3; Ch. 12:1-3 9.1 (a) Under what circumstance is the angular momentum of a system constant in time? The angular momentum of a system is conserved if there is no net to -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #10 Solutions Ch. 12:4-6; Ch. 13 Due Tues, Nov 4, 2008 10.1 A 500 kg satellite is placed in a circular orbit above the earths equator such that the satellite always stays directly above the same point on the equator. This is -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #11 Solutions Ch. 15 Due Tues, Nov 11, 2008 11.1 Consider a sinusoidal mechanical wave traveling in the positive x-direction in a medium. (a) Describe two features of a mechanical medium that are required in order for waves -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #12 Solutions Ch. 16 Due Tues, Nov 18, 2008 12.1 A longitudinal sinusoidal sound wave in monatomic neon (Ne) gas at atmospheric pressure has a frequency of 440 Hz and a wave speed of 380 m/s. The wave is moving in the x dire -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #13 Solutions Ch. 17; Ch. 18:1-3 Due Tues, Dec 2, 2008 13.1 The boiling point of liquid nitrogen (N2) is 77 K. What is this temperature in C? In F? TC = TK 273.15 = 77 273.15 = 196 C . 321 F . TF = (9/5)TC + 32 = (9/5)( 196) -
Iowa State PHYSICS 221
Physics 221 Fall 2008 Homework #14 Solutions Ch. 18:4; Ch. 19 Due Tues, Dec 9, 2008 14.1 According to the rule of Dulong and Petit, the heat capacity of solids should be the same per mole of atoms. (a) What is the predicted molar heat capacity of table sa -
Iowa State PHYSICS 221
What is a vector? A scalar quantity is one that is represented by a single number. (Eg: Mass, length, time, temperature, volume.) Lecture 2 Vectors. A vector is a quantity which has both magnitude and direction. (Eg: Displacement, velocity, forc -
Iowa State PHYSICS 221
ACT: Spheres Two spheres have the same radius and equal masses. One is made of solid aluminum and the other is a hollow shell of gold. Which one has the biggest moment of inertia about an axis through its center? Mass is further away from the axis L -
Iowa State PHYSICS 221
Lecture 27 The Pendulum Damped and Forced Oscillations ACT: Energy oscillations A mass m = 5 kg oscillates at the end of a spring of constant k = 2000 N/m. At t = 0, its acceleration is maximum. How long will it take before the potential energy reac -
Iowa State PHYSICS 221
ACT: Crossed planes Which diagram corresponds to the E-field lines for these two uniformly charged infinite sheets that intersect each other as shown? + + + Lecture 34 Applications of Gauss\'s Law - - - Each sheet produces a uniform electric fiel -
Iowa State PHYSICS 221
Flux in General DEMO: Loop Lecture 33 Electric Flux Gauss\'s Law Flux: How much of something is passing through a surface. How many hairs are passing through your scalp. If you dip a tennis racquet in a river, how much water flows through it? Ma -
Iowa State PHYSICS 221
Example: The electric dipole Lecture 32 Electric field lines. The electric dipole. + +Q d - p -Q Definition: Electric dipole moment p = Q d Direction: From to + What happens to a dipole in an external electric field? An electric dipole is pl -
Iowa State PHYSICS 221
Newton and the Moon Lecture 28 Newton\'s Law of Gravity What is the centripetal acceleration of the Moon for its rotation around the Earth? We know (Newton also knew): T = 27.3 days = 2.36 106 s rmoon-Earth = 3.84 108 m REarth = 6.35 106 m (see -
Iowa State PHYSICS 221
ACT: Two balls Two balls of equal mass are suspended from the ceiling with nonconducting wire. One ball is given a charge q and the other is given a charge 3q. Which of the following best represents the equilibrium position? Lecture 31 Electric Fiel -
Iowa State PHYSICS 221
Lecture 30 Electric Charge Coulomb\'s Law The facts When some objects are rubbed with fur, tissue paper, certain fabrics, etc, they sometimes attract or repel each other. The repulsive/attractive force depends on the distance between the objects, on -
Iowa State PHYSICS 221
ACT: Gravitational forces Two stars of masses M and 2M are separated by a distance d. A spaceship travels between the two stars. The net gravitational force on the spaceship is zero when the spaceship is: Lecture 29 Orbits. Kepler\'s laws. d M 2M -
Iowa State PHYSICS 221
Do you git much work nowadays, Jerry? Sure! LOOK OUT! Review for Exam 2 Example: Goran Bregovi Ederlezi I m p u l s e Tush tush! Don\'t make so much noise! Ooooh! Did you see the size of that brick? I know, but it wuz only on your head a seco -
Iowa State PHYSICS 221
Capacitors Lecture 37 Capacitance A capacitor is a device whose purpose is to store electric energy which can be released in a controlled manner. Usually made of two conductors with charges +Q and Q. -Q +Q . separated by an insulator (dielectric -
Iowa State PHYSICS 221
Angular Momentum Lecture 24 Angular Momentum We want an equivalent of p and of Fnet = dp dt Angular momentum: L = r p = m (r v ) Just as linear momentum quantifies the amount of motion, angular momentum quantifies the amount of rotation. No -
Iowa State PHYSICS 221
Example: Elastic collision What is the velocity of each block if the collision is elastic? Lecture 20 Center of Mass Before 1 kg v1 = 10 m/s 5 kg v2 = 2.0 m/s A. 2.0 m/s, 10 m/s B. 5.3 m/s, 2.7 m/s C. -5.3 m/s, 2.7 m/s D. -3.3 m/s, 2.7 m/s E. -
Iowa State PHYSICS 221
How does Physics work? units Observe and measure ma th th ma ma th Build a model check Make a prediction th ma SI Units Used by scientific and engineering communities and almost everywhere in the world. 10-24 10-21 10-18 10-15 10-12 10-9 10-6 10- -
Iowa State PHYSICS 221
Energy stored in a capacitor = external work needed to charge it Lecture 38 Electric energy Capacitors with dielectrics Work to add a charge dq to a capacitor with capacitance C and charge q: dWext = -dWelectric = - ( -dU ) = Vdq = q dq C Q 0 Tot -
Iowa State PHYSICS 221
Lecture 41 Real batteries. Kirchhoff\'s laws. DC instruments Galvanometer It is the most common current measuring device. Needle Ammeter Used to measure current. A Current through coil + Magnetic field Torque (need 222!) Always in series with the -
Iowa State PHYSICS 221
ACT: Switch on the lamp Lecture 40 Power. Circuits. When a lamp is switched on, the time it takes to light up is: A. Equal to the time needed by the electrons Typical drift in the socket to get to the lamp. B. Zero, it\'s instantaneous. C. Very sho -
Iowa State PHYSICS 221
Physics 221Fall20}7 18 Septernber Written HomeworkdueTuesday A 3.5 kg block is pushed l-alonga horizontalfloor by a forceF of magnitude15N with respect the horizontal(as shownin sketch). The at an angleof 40 degrees to the the coefticientof kinetic -
Iowa State PHYSICS 221
Equilibrium A system is in equilibrium if no part of it is moving. Lecture 25 Statics F Conditions for equilibrium: =0 and = 0 CM is at rest Parts are not moving about the CM. A very useful feature: The system should not rotate about ANY ax -
Iowa State PHYSICS 221
RC circuit = circuit with resistors and capacitors. Lecture 42 RC circuits The simplest one: R C Charging the capacitor R Capacitor initially uncharged. At t = 0, close the switch. + + Charge builds up on the capacitor\'s plates, and Q (t ) VC -
Iowa State PHYSICS 221
ACT: Alice and Bob Lecture 5 2D and 3D motion Alice and Bob stand at the top of a cliff of height h. Both throw a ball with initial speed v0, Alice straight up and Bob straight down. The speed of the balls when they hit the ground are vA and vB, re -
Iowa State PHYSICS 221
Electric current Lecture 39 Current. Resistance. Ohm\'s law. Current = charges in motion. I = dQ dt Units: A (Ampere) 1 A = 1 C/s Current density (current per crosssectional area) J = dI dA I for uniform current = A A = cross-sectional ar -
Iowa State PHYSICS 221
ACT: Heavy (real) pulleys Lecture 23 Work and power for rotations. Examples. Two blocks of masses m1 and m2 (> m1 ) are connected through a string that goes through two different pulleys. Pulley 1 is made of plastic. Pulley 2 is made of iron. In bo -
Iowa State PHYSICS 221
Review of circular motion Lecture 21 Rotations of a Rigid Body. Moment of inertia Description in terms of angular quantities (in radians!): Relation to linear quantities: ; s = R = d ; dt = d dt v = R atan = R y atan atotal R ac s Centrip -
Iowa State PHYSICS 221
Example MOM, YOUR CAR ABOUT AND WAS YOUR GAS MOM, YOUR CAR ABOUT AND WAS YOUR GAS TANK FULL WHEN TANK FULL WHEN HOLDS HOW MANY 15. HOLDS HOW MANY 15. YES. YES. PETER TOOK IT TO PETER TOOK IT TO GALLONS OF GAS? GALLONS OF GAS? RUN ERRANDS? RUN ERRANDS -
Iowa State PHYSICS 221
ACT: Force field The pictures below show force vectors at different points in space for two different forces. Which of these forces is conservative? Lecture 17 Energy Diagrams 1 2 A. 1 B. 2 C. Both Work along a closed trajectories (loops). Re -
Iowa State PHYSICS 221
ACT: Cross product Vectors A, B and C are on the plane of the screen. They are drawn to scale. Compare the magnitude of these two cross products: Lecture 3 1D motion A. |AB| > |AC| B. |AB| = |AC| C. |AB| < |AC| |AB| = AB sin= AC = |AC| C Bsin Bcos -
Iowa State PHYSICS 221
Periodic motion Lecture 26 Simple Harmonic Motion A motion is called periodic when the system comes back to the same situation every time interval T. Same position Same velocity Frequency Examples: Uniform circular motion Earth around the Sun Toy -
Iowa State PHYSICS 221
Electric potential energy Electric forces are conservative (Coulomb\'s law is mathematically identical to Newton\'s gravitational force, which is conservative). So we can write the work done by them as a change in potential energy. Lecture 35 Electric -
Iowa State PHYSICS 221
ACT: Bowling on the Moon Lecture 10 Applying Newton\'s Laws An astronaut on Earth kicks a bowling ball horizontally and hurts his foot. A year later, the same astronaut kicks a bowling ball on the moon with the same force. His foot hurts: Ouch! A. Mo -
Iowa State PHYSICS 221
ACT: Falling objects Lecture 16 Conservative and Non-Conservative Forces Examples. Three objects of mass m are dropped from a height h. One falls straight down, one slides down a frictionless incline and one swings at the end of a pendulum. What is -
Iowa State PHYSICS 221
Potential energy Basic energy You are speeding down the road without a care in the world and just as you are approaching a sharp curve in the road above a scenic overlook you notice that your brakes are soft due to leaking brake fluid. From past ex -
Iowa State PHYSICS 221
ACT: Zero net work The system of pulleys shown below is used to lift a bag of mass M at constant speed a distance h from the floor. What is the work done by the person? Lecture 14 Work: Varying forces and curved trajectories Power A. Mgh B. Mgh C. -
Iowa State PHYSICS 221
Motivation to go beyond Newton\'s laws Newton\' Lecture 13 Work and the Work/Kinetic Energy Theorem mg N Loop the loop N N mg R The normal force has different mg direction and magnitude at every point on the track! Writing and solving Newton\'s la -
Iowa State PHYSICS 221
Momentum and Newton\'s Second Law Lecture 18 Linear Momentum and Impulse Fnet = ma = m d (mv dv = dt dt ) = dp dt Linear momentum Newton\'s second law in terms of linear momentum: A net force is a transfer of linear momentum. p mv Fnet = dp -
Iowa State PHYSICS 221
Goals for Lecture 7 Define Galilean transformation laws between moving reference frames. Define inertial reference frames where Newton\'s laws live (even though we still don\'t know about Newton\'s laws.). Lecture 7 Relative Motion Upside down Gali -
Iowa State PHYSICS 221
What is a force? It\'s a pull or a push. F F Lecture 8 Forces: Newton\'s First and Second It has a magnitude and a direction Forces are vectors! Types of forces 1. Contact forces: - Normal force (always perpendicular to contact surface); it\'s the b -
Iowa State PHYSICS 221
ACT: Battleship A battleship simultaneously fires two shells at enemy ships. If the shells follow the parabolic trajectories shown, which ship gets hit first? Shell A spends 2tA in the air, where tA is the time it takes for vy to become zero: tA tA 0 -
Iowa State PHYSICS 221
Lecture 9 : Newton\'s Third and Free Body Diagrams I SOMETIMES WISH NEWTON HAD STOPPED AT TWO LAWS. Newton\'s Third Law Newton\' For every force, or action there is an equal but opposite force, or reaction. Forces ALWAYS happen in pairs. FAB = -FBA N -
Iowa State PHYSICS 221
ACT: Scale Lecture 11 Friction. Dynamics of Circular Motion A 40N block is hung from a rope attached to a scale. The scale is then attached to a wall and reads 40N. What will the scale read when it is instead attached to another 40N block, as shown i -
Iowa State PHYSICS 221
x(t) v(t) a(t) In general, for 1D motion along a straight line: Lecture 4 Constant acceleration in 1D a = dv dt v = v 0 + a (t )dt 0 t v = dx dt x = x 0 + v (t )dt 0 t One Dimensional Constant acceleration. When a = constant, the eq -
Iowa State PHYSICS 221
ExamI Physics 221,FaLt2007 1. A book is at rest on a desk top. Which of the following forces forms a Newton\'s third law pair with the book\'s weight? A) The normal force of the table on the book B) The force of the book on the table ;Q The gravitatio -
Iowa State PHYSICS 221
PHYSICS 221 Fall 2007 EXAM 2: November 14, 2007 8:00pm-10:00pm Name (printed): _ Recitation Instructor: _ Section #_ INSTRUCTIONS: This exam contains 25 multiple-choice questions plus 2 extra credit questions, each worth 3 points. Choose one answer o -
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Iowa State PHYSICS 221
Plane An airplane needs a minimum air speed of 100 miles per hour (Va) in order to land. The runway is at a 30 degree angle to a 25 mile per hour wind (Vb) which is blowing from the east. What is the speed relative to the ground of the airplane when -
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Iowa State PHYSICS 221
Physics221Fall2007 August28 Written HomeworkdueTuesday equalslOa physicsis the stutce.Oneshake A unit of time usedin microscopic l-thanthereare (or less)shakes in a second are seconds.(a) How manytimesmore is the whereas universe years, haveexisted -
Iowa State PHYSICS 221
Physics221Fall2007 Written HomeworkdueTuesdaySeptanber4 this fails. In the vastmajorityof cases is fatal. a Sometimes skydiver\'sparachute l-with deepsnow whenthe diver doessurvive,uzually associated Thereareraf,eoccasions of that the humanbody can -
Iowa State PHYSICS 221
221Fall2007 Phvsics 11 September Written HomeworkdueTuesday of a 1- You headdirecttyacross straightriver ofwidth 100r4 surimmingataspeed bankhavingbeenswept You arriveatthe opposite 1.5nrlsrelativetothe water. of a downstream distance 50 m. (a) How -
Iowa State PHYSICS 221
Motion of the CM Trajectory of the CM When a shell explodes, the CM keeps moving along the parabolic trajectory the shell had before the explosion. Ptotal = Mvcm Fnet ext = Macm The CM is a good representation of the extended object. Internal forces among -
Iowa State PHYSICS 221
How long does it take light to travel 1 kilometer. 103 m 3.00 108 m s 3.33 10 6 s 3.33 103 ns. -
Iowa State PHYSICS 221
The volume is 0.473 liter. Write this in cubic inches. 0.473 L 1000cm 3 1L 1in 2.54 cm 3 28.9 in 3 . -
Iowa State PHYSICS 221
1 in. = 2.54 cm. Find how many kilometers in a mile. 1 mi 5280ft mi 12 in. ft 2.54 cm in . 1 km 105 cm 1.61 km -
Iowa State PHYSICS 221
Convert 11.3 g/cm^3 into kilograms per cubic meter g 11.3 cm 3 1 kg 1000 g 100 cm 1m 3 1.13 10 4 kg . m3 -
Iowa State PHYSICS 221
Lecture 6 Newtons Three Laws 1st: Any object remains at rest or in motion along a straight line with constant speed unless acted upon by a net force. 2nd: The product of the mass (m) of any object times its acceleration (a) is equal to the net force
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