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Further two H 3 questions 2 72 50 stecl momen rectabgular and 1o 3 stedu kg point plale tmother half acting sheet; Oway of thickness 84 stapled to one 5 side, hae)3...

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Further two H 3 questions 2 72 50 stecl momen rectabgular and 1o 3 stedu kg point plale tmother half acting sheet; Oway of thickness 84 stapled to one 5 side, hae)32

Further two H 3 questions 2 72 50 stecl momen rectabgular and 1o 3 stedu kg point plale tmother half acting sheet; Oway of thickness 84 stapled to one 5 side, hae) 3 2



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A package of aluminum foil contains 50 $\mathrm{ft}^{2}$ of foil, which weighs approximately 8.0 oz. Aluminum has a density of 2.70 $\mathrm{g} / \mathrm{cm}^{3} .$ What is the approximate thickness of the foil in millimeters?

Good day. In this question, we are asked to solve for d thickness of the gold. So we are given that the density of cold Is equal to 19,300 kilogram per cubic meter. And the mass of cold is equal to 6.5 milligram. Now you see them density formula of density was mass over volume. We can solve for the volume of gold. First volume is equal to mass over density. Now you think the formula of volume, it was mass divided by density. We have mass of 6.5 milligrams converted to kilogram is Where one g is 1000 mg. We can write it manually Where 1000 g is one kg divided by The density given is 19,300 kg. Break your big me train, therefore the volume of coal is equal to three points 36 8. I understand to the -10. Your big midterm. Now you say this volume of gold, we know that the volume is equal to the area, that is the thickness, therefore the thickness of the foil. The gold foil is equal to volume be avoided by the area Where our volume is three .368. I will stand to the negative 10 m3 divided by the area given Which is 3.12 cm squared. Get ready to meters. We have 100 cm is one m. This will give us the thickness of gold is equal to 1108. I'm instead. And then I got 36 m. Or gonna write us one x 08. My grow meat there. Thanks.

Okay, So this problem is telling us that the framework of a ball is three machines or color three and one ass. Then we apply 58 edge. Okay, a wall quarter. And then another quarter inch of a paneling and a thickness of a sidings. 3/4 so they wouldn't know What is the total. So, basically, I have to add all the fractions that only whole number we have is three. So you need to get a common denominator, which is going to be eight. So I just go on. The 1st 1 will be five plus for us. Fire. What's to it was two times 36 So this will be eight or nine. And two is 11 and 6 17 17 over a is the same as if you, um, kit to out of this is two and 1/8. Okay, So attitude. And 18 basically to three, 218 to 3. The thickness of the wall becomes five. And money. So that's the answer. Okay. This fraction having and hold on. Thank you.

So we have three sheets off three different jazz justice Sigma 1612 and signatory. What if they're Sigma Tau is negative, where Sigma One and Sigma three are positive. So the elected We want to find out the Force per unit area, which is basically pressure for each HBO cheated. So now we know that force is cured Times where Q is the charge on easy electric field and forced by area is Cuba eight times E, which is Sigmar Times E. Because Cuba A is simply charged. Density has if by a for a particular sheet, let's see, the 1st 1 will be the charge density off that particular sheet times the electric field You do the other sheets now. Also remember that the field you to the 1st 1 s. So let's county feel on the first count it feels on the 1st 1 the field you do the sigma true will be downwards. Whereas let's call this after the kill you to second shed and the field youto the church, it will be upwards because it's faster. So let's find out the values Also remember that the electric field, due to a charge here is Sigma by two. Absolutely not. Now that we have this information for a party to find FAA for she won. It is equal, though, as we saw signal one times e two plus a three. So that is signal One times we know that e to eat three or six by two. Excellent. Not so that Sigma Tau Sigma three by accident. But notice that Signet, wanting a 23 will have opposite directions on DSO. So sick model and Sigma tree. So it's fine now. This is equaled. Oh, you know that's it. My way is minus to into temper minus nine. Colin for meter square, divided by two times. Excellent. Not is obviously 8.85 into 10 ten four minus 12 times. You know that took my duplicity for three years. Fire minus two into 10. Part minus nine. Cool and four meter square. That's right. Don't devalues beforehand. Here. This one is 6.5 Newton Nana, Colin Per meter squared. The 2nd 1 is minus two Nana Colin per meter squared. The 3rd 1 is five Nana Colin per meter square. Now, by letting us know these numbers into a calculator, you can see that This is a widow 1.1 into 10 part minus six Newton per meter square. Now, for this second she the force duty, The Sigma one will be downwards. Whereas the force you do the Sigma tree will be upwards. So we want to find the difference between one and three. No, If I for toe is equal Joe Sick. My two times signal three minus sigma. What? I'm sorry, e three minus one which will be equal to Sigma Tau Phi Tau Epsilon. I'm Sigma three minus signal. Now this will be quick. Minus two into tend bar minus nine. Divided. Right. Who into Epsilon artists? 8.8 or even 10. Minus 12. You know that sigma tree is five noodle Nana couldn't bury the square and see how it is. 6.5 Not now. Calling from the square. So that's minus five minus 6.5. Entertained for minus nine. Cool. A perimeter square which gives us 1.7 into 10 pounds. Minus seven. You done for me? They're square. Notice that this will be in the upward direction. Which is why you which was sick? My three month signal instead of signal one minus six country because they feel due to Sigma three would be upwards Hence, When we go f b minus F one result in hell, we'll be off words depending on the side. Of course, if it's possible Top words No For part three, If I were the 3rd 1 will be simplistic about three times. If you know this, they feel you to the 1st 1 will be downwards. Whereas the field you do, the 2nd 1 will be upwards to so we can simply do f two minus one and find the force in the production. So that's E too. Why does he want which would be Sigma three by 12 Cell or not? Into sick Michael minus the wallet. Notice that Sigma Tau is negative and signal it is positive. So I put a Mars science here so that this minus sign will stay as a minus sign. So this is equal to Sigma Tree, as we know is 5 to 10 part minus nine hole in Parliament square you added by two in tow. We know that exit or not is a find a fight into 10 minus 12 Hello square for Newton meters square and we know that signal. We want a signal. One is to minus 6.5 10 4 minus 19. I'm sorry. Minus nine calling about a meter square, which gives us minus 1.3 into can find Maya six Newton for meter square. Now, you see that? Because this this number is negative, it means the force will be down. Boards go. One more thing to know is because this number is positive. They feel on the first floor she will be upwards to That's it.

The situation is as follows. One, 234 five This has gotta charge off class que on this is gonna charge off. Thus took you so all the charges will be on the top and the bottom surface so immediately we can say that e two equals e four equals zero because they're inside the metal, he for the top surface. So that's got this to be the top surface. The seas E doc and E top due to the top surface on this is e bottom Andi e bottom Now, because this air medals or fish jog on the surfaces on Steve, actually, because they are now, now that we are done with you do any for now, we can consider that the charge here is, you know, tins them off charge. So, e doc, it was Sigma over or surface charge density surface just density over Do. Absolutely not. So now we're just considering this Simply like this is a great wheat charge. You These are played with Charge Cube. That is all that you're thinking now. They're total charge Q ease on the surface, off the initially this service it iwas a this service it iwas a. But no matter what you do, this service city will also be a so the subject area the surface charge density is you over a over two extra. Not it was que alert Do Absolutely not. A Similarly you would find that e bottom It was This is top bottom. It was took you over a over to X or not. It was Q over absolute. Not a Now you want it was heat up thus e bottom because this is pointing to the top on. This is also part of the top. So here they would add up and it was dumb out. Billy 3/2. You over to a you over. It's not a Andi. This is in the tourist atop. So if we say this is the I had and this is these times I had in the region five. It will be negative. E t negative E b. It was negative. Three over Do que over Absolutely not a I had. And in the middle region E three with the e B minus e d in the upward direction. So that would be que over do Absolutely not a in the upward direction now the surface charge density on these four surfaces A, B, C and D. We have we would have epsilon a ease. You can imagine that half this charge will be on the top surface. So absent a equals absolute B equals you over to a it. Uh, see, it was at a B equals took it over to a So that's you over a


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