Thursday, January 20, 2011

Wednesday's packet review (1-19-11)

Today (Wednesday) we had to finish our packet by the end of the period because it will be graded as a quiz. Last week we worked on all of 5.2 and 5.4 with the sub. Yesterday since it was a delayed opening and we just got back from the weekend, we weren't expected to finish the packet thus making it due today.

Overview of the packet:

5.1

examine a book on your group's table.

a. We thought the book (our book) resembled a rectangular prism

b. You can learn about it's length ( 25.5cm), width (20.5cm), surface area (522.75cm^2, 102cm^2, and 82cm^2), volume (2091cm^3), and depth/height (4cm).

c. Perimeter to SA is basically the distance around an object/shape to the unit per area inside the object/shape. Area to volume is basically the same thing but 2 dimensional to 3 dimensional.

d. the volume of the book is 2091cm^3 and we got it by the formula l * w * h = v.

e. yes, there is a formula to find the volume of a soda can (cylinder) by h * c * r^2 = v.

f. No, you can't use the same approach to find the volume of a water bottle because it is made up of multiple 3d shapes instead of one.

5.2

a. Volume to length is practically 3d to 1d because length only measures one line. V to A is, like I said earlier, 3d to 2d. we measure volume in cubic centimeters.

b. There is more than one way to measure the volume of the given object (ping pong ball, coin, a toy, and a dice). A few ways are to use an overflow bucket, use a formula with any variables needed, or a graduated cylinder.

c. Answers may vary

d. You can write down the result of each measurement by adding the uncertainty. Also, if it is compared together with two different units, then you can transform the units into one and then add the uncertainty.

e. answers may very

f. answers may very but your answers should either be the same or close enough to compare.

g. answers may very but uncertainty added to each result should make both the same or even closer.

5.3


It is important to have many ways to find the volume of an object to double check your results and to give you a better understanding of the experiment.

5.4 (if I get an answer wrong you can explain the correct answer below)

a. 0.016666 repeating hours are in a min. 60min = 1hr

b. 1L = 0.2642 gallons 3.785L + one gallon

c. 1,000g = 1kg 0.001 kg = 1 g

d. 1,000,000cm^3 = m^3 0.000001 m^3 = 1 cm^3

e. 1cm^3 = 1ml 1ml/^3 = 1cm

Sorry that I couldn't post this yesterday. Comment if you have anything to say or anything to add!

BB (3rd Blog)

6 comments:

  1. Does anyone remember the extra credit question from Friday?

    BB

    ReplyDelete
  2. It's just like a particle picture or view. same thing.
    BB

    ReplyDelete
  3. For 5.4, yes i guess you can write the solution as 0.017 but there are many other ways too just like the one i used.

    BB

    ReplyDelete