Thursday, May 16, 2019
Unfortunately, like all knowledge, it's use it or lose it. I haven't done differential equations since leaving college. Nor calculus. I know the theory behind them but not the mechanics. I can still do algebra fairly well.
In this novel I'm writing (the second of a planned trilogy that is a prequel to Treasure of the Black Hole), I found an occasion when being able to differential equations would be helpful. But, of course, I don't remember how.
So, instead, I did an Excel spreadsheet.
Here's the situation. The bad guys fired missiles at the good guys. The missiles were accelerating at 100 times the force of gravity (gees). The good guy's ship was accelerating at ten gees toward the missiles. Even though this was taking place in three-dimensional space, I simplified it to being on a line. The captain of the good guys ship asked "How long until the missiles are in firing range." And that's when I realized I had to do the math.
The ship and the missiles were approximately 1 AU apart (98 million miles). I set up a spreadsheet that would at each second calculate how far the missiles had gone and what speed they were going and did the same for the ship, calling its velocity and acceleration negative. I ignored relativity (even though the missiles would be going 5% the speed of light when they were close to the ship).
So I set up my equations (which used the data from the previous equation to do the math) and copied them down (and down and down) until the ship and the missiles were close together on my line. And that happened at 16,653 seconds. or about 4 hours 36 minutes.
And all that work because one character asked a question.
Thursday, May 9, 2019
The biggest issue I have with plastic water bottles is something someone once told me. If you throw out the bottle with water still in it, and the cap on, that water will be sequestered and out of the environment until the bottle decomposes in a thousand years or so (according to this website, it takes about 450 years or more).
Why is this a problem. Well, according to this website (an anti-plastic bottle site), Americans throw out 38 billion plastic water bottles a year. There are 12 billion recycled according to that same website, so almost a quarter of them are recycled. But if each of those 38 billion bottles not recycled end up in a land fill with an average of only one ounce of water in them, that's 296.9 million gallons of water. That's almost 450 Olympic-sized swimming pools.
If there's an average of 2 ounces, that's almost 900 Olympic-sized swimming pools. And that water will not re-enter the environment for 450 years, at least.
So if you're not going to drink all the water in your water bottle, pour the water out. Pour it out on the ground, pour it down a sink. Anything other than leaving it in the bottle. And throw the bottle out with the cap off so the little bit of remaining water can escape.
Thursday, May 2, 2019
In writing a press release, you want to remember the "Five Ws" (plus one "H"). That is:
Who is doing (or did) the thing? Remember to include an email and/or phone number.
What are they doing (or did they do)? Details are important.
When will (or did) it happen? Date AND time.
Where will (or did) it happen? Be specific and include an address.
Why will (or did) it happen? Again, details are important,
And how will it (or was it) done. Details detail details.
If you remember the five Ws and one H, you will do a much better job writing a press release. And I won't pound my head on the desk in frustration.