Math: ratios: making oatmeal: 4:9

Self-tutoring about ratios: the tutor reflects about preparing oatmeal.

The ratio of oatmeal to water, with the brand I use, is 1 and 1/3 cup to 3 cups. As such, it’s a less convenient ratio to scale up or down than some.

Yet, 1 and 1/3 to 3 is actually 4/3 to 9/3, so it’s 4 to 9. That’s an easy ratio to scale up or down. In my case, I scale it up: 2 cups to 4 and 1/2 cups, or 4/2 to 9/2.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Windows command prompt: an example of robocopy

Self-tutoring about copying folders: the tutor mentions robocopy.

robocopy this_dir j:\that_dir /e

As I recall, the above command, from the command prompt, can be used to copy the local directory this_dir to the external location j:\that_dir. The switch /e at the end means to include subdirectories (aka, subfolders) as they are, even if empty.

In my experience, it’s important to mention the destination directory: robocopy doesn’t copy the top level source directory unless you mention it as the destination.

Robocopy lists, at the end, any failures or skips. I’ve used it, in Windows 7, and I’m a fan.

Source:

ss64.com

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

What is ketosis?

Self-tutoring about health: the tutor looks into ketosis.

ketosis (noun):

a state of metabolism in which ketones are being consumed for fuel. It results from low availability of glucose due to low carbohydrate intake.
During ketosis, the body releases fat stores into the bloodstream. In the liver, the fat is transformed into ketones that cells can use for energy.
Ketosis is a natural process that normally does not pose risk to a healthy person. However, to people with health conditions – diabetes, for instance – ketosis may pose serious risk.

Source:

www.webmd.com

dtc.ucsf.edu

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Consumer Education: What does VOC mean?

Self-tutoring about consumer education: the tutor looks up the meaning of VOC.

VOC (noun):
Volatile Organic Compound. Such a compound evaporates readily at room temperature. Therefore, if poisonous, it can produce dangerous fumes while opened, during application, and while drying.

Two examples of VOCs in the consumer’s context:

  1. A product might contain a VOC that keeps it fluid to facilitate application.
  2. A VOC may be contained in a thinner or cleaner for organic products.

There are other examples of VOCs as well, some of which I hope to discuss in future posts.

Source:

wikipedia

www.consumerreports.org

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Warming ice, melting ice, and cooling water

Tutoring chemistry, heat flow between hot and cold substances might be studied. The tutor mentions a reflection about water and ice.

Today, while thawing chicken breasts in water, I wondered how much water would be needed to supply the necessary heat to thaw them.

Interestingly, solid ice heats up twice as easily as liquid water cools: it takes 2.09kJ/kg to warm ice one degree Celsius (say, for instance, from -4C to -3C), but liquid water releases 4.18kJ/kg for each degree Celsius it cools.

Melting ice is a more demanding proposition: it takes about 160 times as much heat to melt a kilogram of ice as to heat it one degree Celsius (once again, from -4C to -3C, for example). In particular, it takes 334kJ/kg to melt ice.

Source:

Hebden, James. Chemistry: Theory and Problems, Book Two. Toronto: McGraw-Hill Ryerson, 1980.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

How to compress a folder or file using 7-Zip, and why you might need to

Self-tutoring about computer skills: the tutor mentions compression using 7-Zip

Here are the steps:

  1. Open 7-Zip.
  2. In the navigation box, find the file or folder you want to compress, then select it with the mouse.
  3. Click Add. A menu box appears with many choices. I select zip for the Archive format and normal for the compression. Leaving everything else as is, I click OK.

One reason compression to zip format might be needed is that some transfer modes will move files, but not folders. In my experience, a file manager can be that way. My understanding is that when 7-Zip compresses a folder to zip format, a file is produced. At the other end, the zip file can be re-inflated, or extracted, or however you see it, back into the folder it was.

There’s a great video to watch about how to use 7-Zip here.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Calculator usage: scientific notation and float notation on the amazing Staples BD-6108 Scientific Calculator

Tutoring high school math, calculators are always interesting. The tutor mentions a new favourite: the Staples BD-6108 Scientific Calculator.

Toggling between float (aka ‘normal’) display vs scientific notation, the Staples BD-6108 Scientific Calculator delivers.

Let’s imagine you want to convert 0.000297 to scientific notation. Here’s how, on the Staples BD-6108:

  1. First, key MODE then 1, which is the mode for everyday decimal calculations.
  2. Next, key 0.000297, then press =
  3. Press INV then the decimal point (which has SCI written above).
  4. To toggle back to normal (FLOAT) notation, just press INV then 0 (which has FLO written above).

HTH:)

Source:

BD-6108 Owner’s Manual.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Lifestyle: garter snake in the garden

Self-tutoring about garter snakes and gardening: the tutor shares about garter snakes.

Until 2012, I used to see snakes fairly often in the yard. Since, I’ve wondered where they’ve gone. After all, reptiles are sensitive creatures whose presence usually suggests environmental health. Furthermore, to my knowledge, we have no poisonous snakes on Vancouver Island. Therefore, a snake here is never a worry:)

A couple weeks back, I finally encountered a garter snake in the garden, to my relief. Maybe they’ve been here all along, but hiding? Perhaps we’ve just been missing each other. Anyway, there it was, alarmed at first, but soon much less timid.

The snake might have been 45cm, brown with red stripes down its sides; I suspect it to be northwestern garter snake.

I decided to research what benefits, etc, accompany snake presence in the garden. Apparently they eat anything they can – rodents (which would have to be very small for the snake I saw), grasshoppers, slugs, etc. Early last evening I observed slugs emerging: I hope that snake is taking notice:)

Source:

www.bcreptiles.ca

learn.eartheasy.com

ahealthylifeforme.com

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Homonyms: cue and queue

Tutoring English, homonyms are always interesting. The tutor mentions the pair cue and queue.

cue (noun):
signal to act or how to behave.

queue (noun):
line-up of individuals waiting their turn for service, entry, or exit.

Source:

Barber, Katherine et al. Oxford Canadian Dictionary of Current English. Don Mills: Oxford University Press, 2005.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Homonyms: high and hie

Tutoring English, homonyms are always interesting. The tutor mentions the pair high and hie.

I imagine everyone knows what high means.

hie (verb):

hurry or hasten.

Source:

Gilmour, Lorna (editor). Collins Essential Canadian English Dictionary and Thesaurus. Glasgow: HarperCollins Publishers, 2006.

Mish, Frederick C. (editor). The Merriam-Webster Dictionary. Springfield: Merriam-Webster, 2004.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.