Wednesday, October 19, 2016

hw #2-8 We're Scaling New Heights

hw #2-8 We're Scaling New Heights
Due Friday(A)/Monday(B)
pg 133-35 #1-5 ALL, #9-23 ODD
pg 73 #14-16
pg 135 #22 include a drawing/diagram
pg 73 #17


  1. I am really confused on the hand in page 135 number 22 because I don't know if when it says 1:144 what unit of measure is that??

    1. When a ratio (without a UOM) is used as a scale, it will work for ANY unit of measure.

      It simply means that if the model is 1 unit high, the corresponding actual rocket will be 144 units high.

      If they said the scale was 1ft to 144ft, when you write the ratio as a fraction, the feet would "divide out" anyway and just leave you with 1 to 144.

      The only time that units need to be sepcified on a scale is IF the units are different, like on a map. For example, in our Florida example, the scale was 1 inch : 110 miles... in this case, the units were required.

      Hope this helps... please ask about this in class... I can put an example on the board.

    2. I am also very confused with this problem. It doesn't make sense, what it's asking.

    3. Dear U-ie,

      Draw a picture. Use the instructions I give above.

      In a scale, if UNITS (UOMs) are not specified, it means that the relationship is a simple ratio. It could be
      1 inch : 144 inches
      1 foot : 144 feet
      1 km : 144 km
      1 gallon : 144 gallons

      IT NO MATTER!!!

      So in this case, you can assume that 1:144 means 1 ft : 144 ft. If you recall from our work with conversion factors, 1 foot OVER 1 foot = ONE!

      So again... I urge you to draw a picture... if the actual rocket is 168 feet tall, how tall would the model be?

      We will go over it in class... I might even make a video tomorrow but I can't guarantee it.

      Can you at least answer these questions? (DRAW PICTURES and set up a proportion that would justify your answers)

      1) If the actual rocket was 144 feet tall, how tall would the model be?

      If the model was 15 inches tall, how tall would the actual rocket be?

      Did this help? Can you at least ask a better question now?

    4. There are several example problems in the "2-8 Proportion Lesson" video... including one with Eiffel Tower...

    5. I got x = 1 1/6 for that problem. Were there supposed to be units in the answer?

    6. Absolutely there should be UNITS in the answer... and I need you to think about it... if someone asked you how tall the model is, would you say 1 1/6 "somethings" or would you use a different UOM. Keep in mind that you are a human being answering a common sense question in a common sense manner!!