Physics 131

Homework

Part of the weekly homework assignment is in Canvas, and part will be done on paper and handed in in class.

NOTE: The homework will be scanned to guard against lost papers. As a result it is very important that you DO NOT STAPLE OR ATTACH YOUR PAGES IN ANY WAY. If you do so, the scanner may destroy them. Also, if you have torn your pages out of a spiral bound notebook, please remove the perforations.

The online homework is due on Friday at 9 PM and the paper homework is due at the beginning of the last lecture of the week (Friday at 10).

The weekly homework will ask youto do 3-5 challenging problems including estimations, explanations, essay questions, worked out problems, and even some challenging multiple choice questions. You are encouraged to work on these with friends. The course center is a good space to work together and get feedback from a TA or Professor. CLICK FOR THE COURSE CENTER SCHEDULE.

You have to write up your solutions independently. Be careful: If two or more submitted answers are essentially identical, neither will receive credit. If your solution is essentially identical to one found on the web, you will receive no credit and all your previous answers will be searched to see if they are also copied. Credit for those found to be copied will be removed.

Some of the ExpertTA problems (mostly multiple-choice and those with numerical or symbolic answers) will be computer-graded, some will be graded for correctness by a human, and some won't be graded (and you'll just get points for completion). However, we won't tell you ahead of time which problems will be graded, so you'll have to do your best on all of them! For the problems that are only graded for completion, make sure you look at the solution afterwards (posted on ELMS); don't let your perfect score on that problem (based on completion) fool you into thinking you did it correctly. (Maybe you did do it correctly, but it's good to confirm that.)

The links below are to pre-XTA versions of the problem that will let you see and explore the problems outside of the XTA environment. Be sure you check that you do the XTA versions when you submit on line, since the questions may not be exactly identical.

When you get your homework comments back, they may contain otherwise-unexplained letters. These are grading codes, and there's a key to them here.

Due date
(Fri)		 Online HW
(XTA via Canvas)
(due at 9 PM)		 Paper Hand in HW
(due Beginning of last Lecture of the week)


HW 0

(8/30)

(In Canvas)

  1. Tell us who you are
    (submit ashort video)
  2. Watch the XTA videos



HW 1

(9/6)
  1. Molecules in a cell
  2. Feeding the cougar
  3. How big is a protein molecule?
  4. Models in biology


HW 2

(9/13)
  1. Equations of counting
  2. Microvilli
  3. How fast do you need to go?
  4. Frame by frame
  5. Why fuss about dimensionality
 Changing the axis on the grand jete


HW 3

(9/20)
  1. Dosing the liver
  2. Graph of a cart on a tilted airtrack
  3. Acceleration at the top
  4. The ball and the juggler
  5. The stooping hawk
 Kinematic equations


HW 4

(9/27)
  1. Conditions for Newton 3
  2. Toy model of a muscle
  3. A homeopathic drug
  4. Son of the ball and the juggler
  5. A remote controlled car
 Forces in a car


HW 5

(10/11)
  1. Kicking a car
  2. Falling coffee filters
  3. Balls up!
  4. Pushing a block on a block
  5. The content in Coulomb's law
 Force between a charge and a dipole


HW 6

(10/18)
  1. Repelling pith balls
  2. Forces between a charge and a dipole
  3. Effect of molecular shape on electric forces
  4. Momentum conservation in subsystems
  5. Colliding carts
 PiP2 cluster stability


HW 7

(10/25)
  1. Molecular collisions (2)
  2. Random or not, here I come
  3. Diffusion through an ion channel
  4. Breaking bones
  5. Blood pressure and strokes
 Molarity, density, and diffusion

HW 8

(11/1)
  1. Kinetic theory and pressure
  2. What's pressure in biology?
  3. Feeling dizzy
  4. Floating in oil and water
  5. The speed of the blood
 Centrifuging blood

HW 9

(11/15)
  1. Fan carts p & E
  2. Kinesin moving a cargo
  3. The perfect bouncer
  4. Child on a trampoline
  5. Launching a block up a ramp

Potential energy of charge clusters

HW 10

(11/21)
  1. Bound states
  2. Two-atom bound state
  3. Exothermic reactions - meso and nanoscopic
  4. Launching a block up a ramp - 3
  5. Energy in photosynthesis - a toy model
 Energy in photosynthesis - light and dark reactions

HW 11

(12/6)
  1. A nice cup of tea
  2. Heating water in a copper pot
  3. The penny and the jelly donut
  4. Now you're cookin'!
  5. Keeping warm

 None
University of Maryland Page last modified November 29, 2019