| Chap 3 | Chap 6 | test 1 review |
sample tests |
| Chap 7 | Chap 8 and 9 | Chap 10 | sample test 2 |
| test 2 review |
final review |
sample final |
sample final
answers |
| Homework Set |
Due Date |
Projects | Exercises | Problems | Other (Extra Credit) |
Solutions |
| 1 | Sept 6 | Chap 2: 8, 14, 16, 18, 23, 24, 30, 38 | See Chapter 1 Problems |
Estimation 1 See below. |
here | |
| 2 | Sept 13 | Chap 3: 4, 6, 14, 26 Chap 4: 6, 12, 24, 26 |
Chap 3: 4, 6, 9 | Estimation 2 see below |
here | |
| 3 | Sept 20 | Chap 4: 28, 30, 36 Chap 5: 2, 8, 10, 24, 32 |
Chap 4: 6, 8 Chap 5: 2 |
TBA | here | |
| 4 | Sept 27 | Chap 6: 2, 8, 12, 20, 24, 38, 40, 42 | Chap 6: 2, 4, 8 | Estimation 4 see below |
here | |
| none | Oct 4 | No homework. Study for the midterm using the sample tests |
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| 5 | Oct 11 | Chap 7: 2, 4, 8, 10, 16, 18, 20, 34, 36 | Chap 7: 2, 6 | Estimation 5 see below |
here | |
| 6 | Oct 18 | Chap 8:3, 4 | Chap 7: 40, 44, 48 Chap 8: 2, 4, 6, 10 |
Chap 8: 2 |
Estimation 6 see below |
here |
| 7 | Oct 25 | Chap 8: 18, 22, 34, 36, 46, 48 (see hint below), 49 (and two more below) |
Chap 8: 6 (and two more below) |
Estimation 7 see below |
Here | |
| 8 | Nov 1 | Chap 9: 2, 10, 11, 14, 26 Chap 10: 12, 18, 38 (and one more below) |
Chap 9: 2, 6 Chap 10: 6 |
Chap 9: Prob 10 | Here | |
| none | Nov 8 | No homework. Study for the midterm using sample test |
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| 9 | Nov 15 | Chap 22: 2 | Chap 22: 4, 6, 8, 10, 18, 20, 24, 32, 38 | Chap 22: 2 | Estimation 9 see below |
Here |
| 10 | Nov 22 | Chap 23: 4, 16, 18, 20, 22, 26, 28, 38, 46, 50 | Chap 23: 6 | Estimation 10 see below |
Here | |
| 11 | Dec 6 | Chap 24: 2, 8, 18, 20, 22, 28, 30, 34 Chap 25: 2, 4, 10, 18, 26, 27, 34 |
Chap 25: 2 | Estimation 11 see below |
Here |
Extra 1: An astronaut with a mass of 70 kg is in a space station rotating to give him the same weight as on Earth. What is the weight of the astronaut (in pounds) on the Earth? Something goes wrong and the rotational velocity of the space station doubles. What is the apparent weight of the astronaut now (in pounds)?
Extra 2: Neglect the weight of a meter stick and consider only the two weights hanging from its ends. A 2 kg weight hangs from one end and a 4 kg weight hangs from the other. Where is the center of mass of this system (the point of balance)? How does your answer relate to torque? (Hint: This is the same as Problem 3, but with the numbers changed.)
Hint for Chapter 8, exercise 48: The phrase 'How does the wheel respond' means 'Does the wheel rotate? If so, in which direction does it rotate?'
Chapter 10 extra exercise:
Suppose that you drop an object from an airplane travelling at constant velocity
and further suppose that you can ignore air resistance. a) What will
be its falling path (ie: its trajectory) as observed by someone at rest on
the ground but off to the side where they have a clear view of the plane
and object? (Draw a picture to show your answer.) b) What will
be the falling path as observed by you looking downward from the airplane?
c) Where will the object strike the ground relative to you in the airplane?
Estimation Problems (extra credit):
Chapter 1 Estimation: Your chance of
winning MegaMillions is about 1 in 10^8 (ie: one in one hundred million).
This is the same probability as drawing the only correct card from a deck
with 10^8 cards. If you stacked 10^8 cards in a single pile, how tall
would that pile be (in meters)? Which distance is this closest to:
a) a tall building (100 m), b) a small mountain (1000 m), c) Mt Everest (10,000
m), d) the height of the atmosphere (10^5 m), e) the distance from here to
Chicago (10^6 m), f) the diameter of the Earth (10^7 m), g) the distance
to the moon (4x10^8 m)?
Estimation 2: The average American drives 12,000 miles per year. How many hours does she spend in her car each year? How many total hours do ALL Americans spend in their cars each year? How much is this in years? In lifetimes?
Estimation 4: Can you run fast enough to have the same momentum as an automobile rolling at 1 mi/hr? Make up reasonable figures to justify your answer. (Obviously your answers will differ for a Mini or for a huge SUV.)
Estimation 5: How much potential energy do you gain (in Joules) when you climb the highest mountain in Virginia Beach (Mt. Trashmore)? When you climb a real mountain? How much is this in food calories (1 food calorie = 4000 J)?
Estimation 6: When you are driving at 30 m/s (60 mi/h), what is the rotational speed of your automobile tires? What is the linear speed of a point on the rim of your tires? How many rotations do your tires make in driving one mile?
Estimation 7: What is the rotational inertia of the Earth as it spins on its axis? What is the rotational inertia about the axis of the Earth of the entire human population if we were all standing at the equator? If we all moved from the equator to the North Pole, by what fraction (eg: 10^(-1), 10^(-2), ...) would the total rotational inertia of the Earth change?
Estimation 9: A penny contains about 10^25 protons and 10^25 electrons. If all the protons in a penny were placed at the North Pole and all the electrons were placed at the South Pole, what would be the electrical force between the protons and the electrons? Give your answer in Newtons and in pounds. How does this force compare to the weight of a person (100 lbs), a small car (1000 lbs), a small truck (10^4 lbs), a loaded semi trailer (10^5 lbs), a small cargo ship (10^6 lbs), the USS Wisconsin (10^8 lbs), a super tanker (10^9 lbs), a large hill (10^15 tons), a Virginia mountain (10^20 tons), Mt Everest (10^23 tons), ...
Estimation 10: On average, how much total power do Norfolk, Virginia Beach, Portsmouth and Chesapeake use? Hint: consider how much power one household uses and multiply by the number of households in the region. Give your answer in Watts. One significant figure is sufficient since only the exponent (the power of ten) really matters.
Estimation 11: Your computer's disk drive holds 100 GigaBytes of data (that's 10^11 Bytes = 8*10^11 bits). The bits are encoded on the disk drive by small regions that are magnetized in one direction or another (eg: either up or down). How large a region does it take to encode one bit of data? Express your answer in square meters (m^2). If each region is a square, how long is the side of the square? (If the square is 9 m^2 then the side of the square is 3 m. If the square is 0.01 m^2 then the side of the square is 0.1 m.)