Does anybody know a good website for help on the subject of Physics? I am taking General Physics I and am already needing help in the first week of class. I have all the prerequistes for the course but I still find some of the things confusing. So if any of you know a website that is helpful or if any of you want to help please post. Here is one of the problems I am having trouble on: Mivalle has a population of 40300 and an area of of 8.5 miles(squared). What is the population density? Answer in units of people per miles (squared). What exactly does that have to do with Physics? I have had to find the density of a cube and sphere already but what does population density have to do with Physics?
Uhm.. Is it not 4741.2 people per square mile? Maybe they want you get ready to find the density of certain substances.. ?
Here's one: Women = Time and Money If time = money, then we can say; Women = Money² We all know the root of all evil is money, so we can says; (Square root (of evil) Money²) = evil Women = evil
Yeah that's the answer, I'm sorry I worded the problem wrong. I meant I was having trouble understanding what that has to do with Physics. NOW here is a problem I am HAVING trouble on: The mass of Saturn is 5.64 x10 to the 26th power and it's radius is 6 x 10 to the 7th power. Calculate it's density. Answer in units of kg/m (cubed). OK I understand this part, the answer is 623.2044199 kg/m (cubed). I don't however understand the second part which says this: If this planet were placed in a large enough ocean of water, would it float? The 3 answers are no, yes, and not enough information. I said not enough information but somebody told me that is incorrect. How are you supposed to figure this problem out?
ok, I havent done physics in a long time but dont you compare the density of Saturn to the density of water. If Saturn is less dense than water than it should float. I dont remember the density of water so I cannot tell you if it is yes or no.
I am not sure but I'll give it a try. If you know the answer please don't tell me because I would like to figure it out. Thanks.
Whatever the answer is let me know and explain your answer. This is one of those things that will drive me nuts now that I have thought about it.
Master Baiter is right here. If the density of Saturn is less than that of water, it will float. If not, it will sink. That said, if you want to cause a stink, you can argue that part of Saturn is gaseous (isn't it?) and that it wouldn't all "stay together" if you stuck it in this imaginary monstrous pool of water. Thus, it may or may not float depending on how much of it floats away and separates from the solid portion of the planet.
I believe the answer is no, it will not float although I'm still unsure. This is how I see it MB, if the density of Saturn is more than water it will sink and the density of Saturn as I stated before is 623.2044199 kg/m (cubed). Well the density of water is 1 gram/cm (cubed) and if you convert that into kg/m (cubed) the density of water is only 100 kg/m (cubed) so my guess is that Saturn wouldn't float but like I said it is just a guess. Somebody let me know if I am wrong.
<B>Well the density of water is 1 gram/cm (cubed) and if you convert that into kg/m (cubed) the density of water is only 100 kg/m (cubed) </B> Are you sure on this? If you take 1g/cm3 (cm cubed), that's 0.001kg/cm3. To convert from CM3 -> M3, you multiply by 100 x 100 x 100, which comes out to 1000 kg / m3. Unless I messed something up, which is also a good bet.
Major's right. What does the population question have to do with anything? Probably to show you that concepts in physics (like density) are not used in simply one scientific class. Also, to show you that the concept itself is rather simple (problems start real easy, then get incredibly hard and you say to yourself, "where the hell did this come from?").
Pressure. <A HREF="http://www.windows.ucar.edu/tour/link=/earth/Water/density.html&fr=t&edu=high">Sea Water</A> <A HREF="http://www.talknet.de/~alke.spreckelsen/roger/thermo/density.html">Calculation of Sea Water Properties</A> Mango
Salt water properties aren't necessary. The problem states water, not salt water. No oceans on earth are big enough to handle Saturn so take the problem at face value. Even if you don't take problem at face value: Salt water> Water Water > Saturn Salt water > saturn. I believe this site will be good for physics problems.
i just took physics last year and made an a too.. lol. it's amazing how much you forget so fast. i bet if i look over some notes a lot of this stuff will come back to me..
Why would you multiply by 1000? I understand 1000 grams = 1 kilogram but I thought 100 centimeters = 1 meter, how does that add up?
I can't let me Geology degree to go to waste here. Saturn would float in water. btw: that means we can use it to see if someone is a witch. It is simplest to understand these problems if you multiple by 1 to do your unit conversions, thus making the units cancel out. This is how you write both densities in g/m^3 <pre>623.2044199 kg 1000 g ---------------- X --------- = 623,204 g/m^3 1 m ^3 1 kg</pre> notice how 1000g/1kg = 1 and the kg unit cancels in numerator of 1st fraction with denominator of second fraction. versus water which is <pre> 1 g 1 cm x 1cm x 1cm 1 g ------------ X ------------------------ = ---------- 1 cm ^3 .01 m x .01 m x .01 m .000001m^3</pre> here the second fraction in the equation is a different way of writing 1 cm^3 . thus your cm units cancel out and are replaced with m^3 therefore, <pre> 1 g ----------- = 1,000,000 g/m^3 <font face="courier"><b>(so water is heavier)</b></font> .000001m^3</pre> <b>Now, someone owes me $10 for that tutorial.</b>
