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Picking the Right Makeup Case
Does your current makeup storage unit look as though it has been ransacked, costing you several minutes of your time just to find that perfect shade of eye shadow you love? Maybe it’s time you considered investing in a different method of keeping your makeup organized. Something like a…cosmetic case?
A cosmetic case might bring to mind a simple cloth or plastic bag with a zipper. Pull yourself out of the 7th grade and pay attention to modern developments! A state of the art cosmetic bag comes in two basic types: hard and soft. We’re going to talk about the most popular materials used for each type, as well as the advantages of both.
Hard cases are generally made with an aluminum frame. Many aluminum cases also have reinforced corners to add that bit of extra protection for your things. These hard cases are available in two standard sizes: large (about the size of a small suitcase) and train case (smaller, about 2/3 the size of a large case). Don’t be tempted to believe that the “aluminum” part means you have to settle for a silver-colored bag. On the contrary, many new colors are being released all the time--even print designs! It is true that the most popular-selling colors are black and silver, however the following colors are also popular choices: pink, red, green, purple, and brown. Aside from the obvious advantage of the hard, protective shell, a special trait of the hard cases is that most of them have multi-tiered trays inside that slide out to display all of your things, then simply collapse back down into the case when you close it. Some have pockets or removable dividers for the belly of the case, making organization as easy as pie!
If a heavy duty aluminum case sounds a bit “more” than what you’re looking for, perhaps you should consider a soft cosmetic case. Soft cases have the added advantage of being lightweight and pocketed. If you desire more of a casual look, definitely consider a soft case; some are designed to look like a gym bag while others have a close resemblance to a fashionable handbag. Do you dig the idea of those cool multi-tiered expandable trays we mentioned when we talked about the hard cases? Don’t worry, some soft makeup cases have those, too! Some models even have zipper segments near the bottom of the bag that hide sectioned trays, which are great for hair accessories, nail supplies, and other small items that can get lost easily!
Whichever makeup case you decide to go with, take your time and do some research so that you’re more likely to be pleased with your purchase. They aren’t the cheapest organizer for your makeup, but they’re definitely worth the price when you consider the durability, convenience, and accessibility they can offer.
Energy in a Capacitor?
Info:
A capacitor consists of two closely spaced metal conductors of large area, separated by a thin insulating foil. It has an electrical capacity of 3000 × 10-6 C/V ( F) and is charged to a potential difference of 66.0 V. Calculate the amount of energy stored in the capacitor.
Question:
If the two plates of the capacitor have their separation increased by a factor of 8 while the charge on the plates remains constant, by what factor is the energy stored in the capacitor increased?
I know that the difference in capacitance is a factor of 8.
U = 1/2*C*V^2
and I thought the energy would go up by 4, but that is wrong. What am I doing wrong?
You're putting mechanical energy into the system by separating opposite charges. C becomes C0/8, Q stays the same (conservation of charge), so V becomes Q/C = 8V0.
PE0 = V0^2*C0/2; PE1 = (8V0)^2*C0/16 = 8 PE0.
PE increases by a factor of 8.
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