How Can I Make A Diy Stopwatch It

Ideas for my track coach's wedding gift?

For the wedding, all you really need to give her is a pretty card with your signatures. She is well aware of your financial situations - and isn't expecting a "gift" other than your most sincere best wishes.

Are any of you good at scrapbooking? If so, then you all can get together - with your school's newspaper and yearbook staff and make her a memory book with photos and clippings etc. about your track team and her other coaching efforts over the seasons - and yes, include items from seasons past so she will remember the other teams she has coached.

Barring that, you can all chip in and get her one of those electronic picture frames that changes the image every so often - and download pictures to that.

It's OK that the scrapbook be about you-all. That's what she wants to remember anyway.

Again, a pretty card with your sincere best wishes is all that you need for her wedding "present."

There’s two ways. THe interstate highways have mile markers that areplaced by the side of the highway every mile and are small vertical rectangular signs with three numbers showing the miles to the border of the state. So use a stopwatch and count the seconds to go exactly a mile between mile markers. They come in many styles. depending on the highway system.A better way is to use a GPS handheld or car unit or cell phone GPS that reads actual velocity. Because of the GPS characteristics this will usually be quite accurate. GPS will be computing the time it takes between positional changes and averaging this. Its time base is among the most accurate available to man and the relative (called differential) accuracy between close points in distance and time is very high, much higher than the absolute position. So GPS unit computed velocities should be very accurate.As for car speedometers, I find them inaccurate more often than not. They depend on wheel and transmission RPM sensors but the great variable is converting wheel circumference to distance. Wheel circumference varies by quite a few percent depending on relative inflation and on tire wear - a new tire vs old will have half inch diameter variation due to tread wear which affects circumference. Most speedometers I have checked lately are about 3–5% high. If it says you are doing 60 then you are really doing 57 mph.

You would need a stopwatch and a good ear to listen. If you time how long the journey takes to drop the stone in the well then use the found, say 1.52 seconds, then multiply that by the speed of gravity. On earth the general speed of gravity is about 9.8 metres (32 ft) per second every second. The strength of gravity on earth can vary depending on location. But the above is a general speed. Since the stone is being dropped down the well, there will not be alot of wind resistance.So in this case its 1.52 x 32 = 48.64 feet per second

Photograhy Black Room?

Here's a list of all the stuff I had in mine (and it's quite a lot!)... This is for black and white, as you will need near complete pitch black to do colour!

In general...
1, Blackout curtains
2, Red light bulb (special one though, not just a red bulb for a DIY shop)
3, Water supply
4, Wall clock

For developing the film...
1, Dry developing tank and spiral
2, scissors
3, changing bag (if developing without being in complete darkness)
4, something to bust open your film canisters (I bust them open with my thumbs like the incredible hulk!)
5, measuring cylinders
6, stopwatch
7, universal developer (can use it for prints too!)
8, universal fixer
9, universal stop
10, tea towels (in case of slight leakage)
11, Something to bang the container against every minute (to stop bubbles preventing even developing)
12, Tube to feed water into the tank when washing
13, Rinse agent
14, Squeegy
15, Film clips and somewhere to hang your film to dry

Developing the pictures...
1, Light safe for paper
2, Varigrade paper
3, Filters for varigrade paper
4, Enlarger, negative carrier and lens
5, Focuscope
6, Blower brush
7, Easel
8, Enlarger timer
9, 3 developing trays (1 for each chemical mentioned before)
10, 3 pairs of tweezers (don't want to cross contaminate)
11, tub with holes in (make one) so water can circulate when washing
12, Drying rack

Ta da! Hope I didn't forget anything! :o) Have fun!

Answering Sarthak Gera A2AFrom the coaching section: "Naturally, the best thing possible to use would be a radar gun - however they're not generally widely available to clubs and schools - but there is a simple way that needs just a stopwatch and a calculator (or maths geek) to provide approximate results. [1]Start the stopwatch when the ball is released, and then stop it again when either the batsman hits (or misses) it.Then divide 45 (or 72) by your answer to get your answer in miles per hour (or kilometres).For example, a delivery timed at 1 second has travelled at about 45mph (72kph). To break the magical 100mph (160kph) barrier, the clock must register at 0.45 seconds. Once you get used to working the timer, you will get surprisingly consistent results.Footnotes[1]

Well i would not say about a time table or something but what I believe is that you should have a habit of studying atleast 3 hours continuously without any distractions (not even peeing) … Jokes apart, i think that this helps to set a body clock which will be very fruitfull at the time of exam as you will have a habit of focusing for hours and your brain will be at max efficiency…as for time table i suggest its a DIY thing you know how much you have got to prepare and how you have to cover it up so plan it yourself … But you should have a habit of solving papers or studying with full concentration for min 3 hours. I would suggest that make a habit of solving questions keeping a stopwatch to improve time management and accuracy ultimately these things will only count and it doesn't matter how much you know about all the stuff , if you are not able to solve that question within given time you are in the same lot of people . Best of luck!

Your question begs another question. Why would you want to use a mouthwash? There is very little purpose to using mouthwashes. Basic brushing and flossing should be sufficient in keeping teeth clean, gums healthy and being free from bad breath.There are however some uses for some particular mouthwashes. One mouthwash uses an essential oil which inhibits plaque growth. Another uses a chemical to do the same thing. So, for example, if one has had gum surgery, one or the other mouthwash may be prescribed to use to help heal the surgical site but usually for only about 2 weeks.Both of these mouthwashes are indiscriminate, they kill both the bad bacteria and the good oral bacteria. The good oral bacteria aids in glucose control and blood pressure levels.Sometimes, and very rarely, some build up so much bacteria that a mouthwash will be prescribed until such time that these people can lower the bacterial counts in their mouth. Once the numbers are stabilized, there is no longer a need for the mouthwash.

Go to Adafruit (I’m not an employee - just good customer) and look at this product: Adafruit 0.56" 4-Digit 7-Segment FeatherWing Display - Blue This comes with a chip on the back to which you send the pulses to count, and wont have to run all the many wires and resistors it would take to control each segment indivudually.You will need something to count so look for a NE 555 timer chip to generate pulses to send to the display. A tutorial about the timer is here: 555 TimerYou will also need a power supply of 5 volts