The work formula provided above isn't just useful for finding work it's also valuable for finding any of the variables in the equation when you already know your value for work. In these cases, simply isolate the variable you're looking for and solve according to basic algebra rules. For example, let's say that we know that our train is being pulled with 20 newtons of force at a diagonal angle over 5 meters (16.4ft) of track to perform 86.6 joules of work. However, we don't know the angle of the force vector. To solve for the angle, we'll just isolate that variable and solve as follows: 86.6 = 20 5 Cosine() 86.6/100 = Cosine() Arccos(0.866) = = 30o In physics, work is closely related to another type of measurement called "power". Power is simply a way of quantifying the rate at which work is spent in a certain system over time. Thus, to find power, all you need to do is divide the work used to displace an object by the time it takes to complete the displacement. Power measurements are labeled with the unit watts (which are equal to joules per second). For instance, for the example problem in the step above, let's say that it took 12 seconds for the train to move 5 meters (16.4ft). In this case, all we need to do is divide the work done to move it 5 meters (86.6 joules) by 12 seconds to find our answer for power: 86.6/12 = '7.22 watts. Work can also be used to find the energy held within a system. In the formula above, TMEi = the initial total mechanical energy within the system, TMEf = the final total mechanical energy within the system, and Wnc = the work performed on the system due to non-conservative forces.. In this formula, if the force pushes with the direction of motion, it's positive, and if it pushes against it, it's negative. Note that both energy variables can be found with the formula ()mv2 where m = mass and v = volume. For instance, for the example problem in the two steps above, let's say that the train initially had a total mechanical energy of 100 joules. Since the force in the problem is pulling the train in the direction that it's already traveling, it's positive. In this case, the train's final energy is TMEi + Wnc = 100 + 86.6 = 186.6 joules. Note that non-conservative forces are forces whose power to affect an object's acceleration depends on the path taken by the object. Friction is a good example an object pushed over a short, direct path will feel the effects of friction for a short while, while an object pushed over a long, meandering path to the same ending location will feel more friction overall.
++++++++++
One-sentence summary -- Reverse the formula to solve for distance, force, or your angle. Divide by the time spent in motion to find power. Use the formula TMEi + Wnc = TMEf to find the mechanical energy in a system.

Find some quiet time when you and your mom can have a chat alone. Don't freak yourself out! Try not to think about it too much, and instead just dive right in. Remember, she's your mom; there's nobody in the world who loves you more, and she understands what you're going through. Approach the topic any way you like, whether you've got a whole song and dance planned, or if you want to start off by saying you feel a little uncomfortable but need to talk to her. If you are having trouble figuring out what to say, try something like: " I think I started my period." "Can we go to the store? I need some things." "This is difficult for me to say, but I've started my period." "I don't know how to say this, but ''it'' came" " I just wanted to tell you I've started my period..." Anytime you are alone together is a great time to approach the subject with your mom, especially if the idea of a formal sit-down with her seems too nerve wracking. You can do it on the way to school, soccer practice, or piano lessons, while watching TV, out for a walk, before she says goodnight, or any other time you have together that isn't rushed. Casually let your mom know that you got your period. Segue into the subject by asking her how old she was when she got her period if you don't feel comfortable coming out and saying it. Work it into a conversation about something completely non-related if you need to. That will give you time to get talking and relax, and then you can slip it in when you feel comfortable. Out shopping together can be a great opportunity to tell your mom about your period without really having to bring it up. Steer her toward the feminine hygiene products in the grocery or drug store, and tell her that you need to pick up some supplies. This is a great time to ask her about recommendations, and she'll pick up on the fact that you're trying to tell her about your period. Getting your period means your body is going through a number of changes. Ask your mom any questions you have. This is a great time for you to bond, and she'll probably have loads of stuff she wants to talk about. Use this time to ask her about sexual health as well if you are comfortable bringing it up. Ask if she has any favorite products, what she craves when she's on her period, and how she manages any PMS symptoms or cramps.
++++++++++
One-sentence summary -- Ask to talk to your mom in private. Casually bring it up when you're together. Make an intentional stop in the feminine hygiene aisle with her. Ask questions.

They come in several sizes and wingless and flightless as well. Flightless is a better choice than wingless, as wingless can revert back to the flying. You shouldn't have to worry about escapees, because the company will have secured them. They breed in the vials, but it's not recommended: they will over-crowed and die. Fill the cup up 1/4 full, maybe a little more, and this lasts about a month or so. If you use "Organix" remember to add the mold inhibitor.
++++++++++
One-sentence summary --
When buying fruit flies, choose the type of fruit fly you want, online. When buying them, get an extra order of fruit fly media (food), bedding and culture cups. When the box comes, remove the contents. If they are in small vials, put them in a freezer for a couple seconds, no more than ten, to slow them down a little, then pour them into a culture cup. Pour the fly food into a culture cup, adding the amount of water the package instructs you to. After assembling your culture cup, add the flies you bought/caught.