Homework Help

Help!: 1. A 14 g coin slides upward on a surface that is inclined at an angle of 16° above the horizontal. The coefficient of kinetic friction between the coin and the surface is 0.23; the coefficient of static friction is 0.31. Find the magnitude and direction of the force of friction under the following circumstances. (a) when the coin is sliding .03 N parallel to the incline up the incline down the incline (b) after it comes to rest .012 N parallel to the incline down the incline up the incline 2. A 80 kg astronaut and a 1300 kg satellite are at rest relative to the space shuttle. The astrona…

Q1: Calculate the amount of 6M HCl that would be required to neutralize and acidify (to ~pH2) the reaction mixture of 1g Benzaldehyde and 2mL 10M KOH. I think this is the chemical equation: Benzaldehyde + KOH + H+ -> Benzyl Alcohol + Benzoic Acid Q2: 64% yield of 1,1 - diphenylethanol and a 16% yield of biphenyl is isolated from the complete reaction of 1.70g of acetophenone. Determine the masses of the two products. Q3: In the reaction of cyclohexylmagnesium bromine with butanone, the Grignard reagent was prepared from 6.0g of cyclohexyl bromide and was then treated with a solution of 3.9g butanone in 25mL of "wet " diethyl ether (the ether contains 1.0% of …

i am studying vascular plants and i am having difficulty finding the answers to certain questions...can someone please help me out with the the following: what are the special enviornmental conditions a taproot is adapted to? where is the parenchyma, sclerenchyma, and epidermal tissue located? thats enough for now...will probably be more to come please help.

Hello everyone, As an engineering student at the University of Leuven (Belgium), I was given a task to determine the effect of the polarization of laser beams on the maximum cutting speed that can be reached with these beams. I haven't found anything that could help me out on the net, and specialized libraries only had more common books about lasers. So I'd be glad if someone could give me a little information on this subject. I was thinking in the direction of energy contained in polarized electromagnetic waves, but I suppose that's not the only factor... Thanks already, Jan

I can't seem to find what these explanations refer to in my book. I tried internet but it doesn't help either so I'm asking help here. _ _ _ _ _ _ _ _ _ ---> A fused group of cells _ _ _ _ _ _ _ _ _ _ ---> Muscles that work in concert This was in muscle worksheet but way I view it, I don't even know if first one is term in muscle (if it is, maybe I don't know it?). Also, second one made no sense to me. Muscles that work in concert? Is there any other concert that rock 'n' roll concert? Thanks. I appreciate this. It would be great if I can get reply soon.

Ive tried my best to answer please, can someone check it? Physical vs. Chemical Properties 1. Red color - Physical property 2. density - physical 3. flammability - physical 4. solubility - Chemical property 5. reacts with acid to from hydrogen - Chemical property 6. supports combustions - Chemical property 7. bitter taste - Phyiscal property 8. melting point - physical 9. reacts with water to form gas - Chemical Property 10. reacts with a base to form water - Chemical Property 11. hardness - Physical property 12. boiling point - physical property 13. can neutralize a base - chemical property Phyiscal vs chemical change 1. Sodium hydroxide diss…

Someone had one of these in Science class today. Everyone was interested so the teacher assigned extra credit for anyone who could tell her how it works. Has anyone seen this technology before? The only link I could find is below. Thanks! http://www.youtube.com/watch?v=5hamvMFwKgo

How do the conditions for nitration of methyl benzoate differ from those for the nitration of benzene? what is the mechanism nitration of methyl benzoate to form methyl 3-nitrobenzoate? Thanks.

Hi all, I have a question on an assignment that requires me to draw a structure for a transition-metal carbonyl complex [Fe2(CO8]2- (I'm new to this forum and cannot see where to apply super/subscript). To work out the structure, I first need to apply the eighteen electron rule. I have worked out that Fe is in the oxidation state +1 and thus each Fe ion contributes 7 electrons. There are 8 carbonyl ligands supplying a total of 16 electrons, that's eight each to each Fe ion - a total of 15 electrons. I know that the metal can be bonded to itself in these complexes but it there is an Fe-Fe bond then that would only supply one additional electron, taking my total to 16…

Ok so I'm trying to understand ACLs (Access Control Lists) and I just somehow can't get it. Especially the part about the wildcards. any help???

Hi, well i have been writing at the chemistry section as well as the experiment sections but i have not recieved a single reply. Now this is really frustrating( i am sorry but i need to express my feeling here, but i have exams in a fortnight and i only sit on the internet just to check whether there are any replies to my problem!). Well, i think its better to digest my anger and try on this section because i was told to get quick replies this is the best place. MY QUESTION: " How do you prepare a solution of any substance if given to prepare X mol dm-3 solution. For example, if we are given hydrogen peroxide, then how will we prepare a 1.00 mol dm-3 solution of i…

Hey i was wondering whether there are mentors on this website? I would like to become one!!! Also who knows easy instructions for making a generator? :confused: :confused: Alo im super cool!!!!!!! :cool: ;) ;) :D :D :D

Dear Readers.......... for the detection of sulfide bearing minerals, which is the best used survey. here is some infomation.......... the dyke of sulfied mineral is tilted about 45 degree and the host rock is granite. there is difference in density is higher in Dyke, susceptibility is 100 times higher in dyke & resistivity is 30 times higher in host rock. Ascol

Is it possible to orient a current carrying loop of wire in a unifrom magnetic field so that the loop will not tend to rotate? I say no because the field of the loop always points in the same direction....but it doesnt sound right?! Give me some feedback please!

I took my final about a week ago, and I was curious about the answer to one of the questions. I haven't been able to ask my professor about it (since I'm no longer in that class), so I figured I'd try here. Consider the following balanced equation. The reaction is endothermic as written. BaSO4(s) + H(+)(aq) in equilibrium with Ba(2+)(aq) + HSO4(-)(aq) (I was going to use the LaTeX, but when I looked at the guide all the appeared were errors, sorry). Which of the following effects will favor a shift to the right side? (A) Decrease temperature (B) Decrease pH © Add a soluble barium salt (D) Increase the pressure in the container (E) Add more BaSO4 (s) …

this is the practice final, and I don't understand all the answers... please help me understand. Thanks Answer choice A. But why does the phenyl group react three times? Does it have anything to do with the aqueous acid attacking the carbonyl oxygen? To me, it looks like they all have aromatic character, except for E, but the answer is given as D. I don't really understand how equilibriums work with amino acids, which have multiple pKas. The answer is given as E. Answer is B. But why wouldn't the acid react with the carbonyl oxygen? I though that would be more reactive than the double bond, and would be protonated over it. …

Hi all, does anybody know if there is a good site on the internet that can provide me with information regarding the analysis of paper chromatograms? I have taken some samples during a lab class and now have to do a small assignment based on them. I'm not really sure on how to analyze them properly. Any help would be greatly appreciated

Hi there, I need to find a positive test for a tertiary alcohol; specifically 2-methylpropan-2-ol. I am aware of oxidising alcohols with an oxidising agent to distinguish between them but this is not a positive test for tertiary alcohols. Any nudge in the right direction would be much appreciated.

Hey all. I was assigned a biology project about a month ago, and I came up with this. I wanted to see how salt would impact the growth of lima bean plants. My independent variable was the salinity, and I used four different salinity levels; fresh water, brackish water, saline water, and brine. The problem is, in the three weeks since I've planted it, nothing has grown. I was very careful with the measurements, and I watered the plants each day and everything. Now I have a project due on Wednesday and I don't know what to do. The question is, can regular terrestrial plants (like the lima beans) grow if watered by brackish, saline water, and brine? I figured they wouldn…

I am having trouble with a probability problem: On average, how many rolls of a pair of dice will it take until the sum of the two dice is four? That is, I roll two dice. If the sum of the dice is not 4, I will roll again until it is 4. How many rolls should it take on average? I know that there are two possible ways to get a sum of four: either one of the dice is a 1 and the other is 3, or both of them are 2. There are 19 combinations of dice that do not results in a sum of 4, so the probability of getting a sum of 4 is 2/19. Now how do I figure out the expected number of rolls it will take to get a sum of 4? This problem is not even for a statistic…

what are the characteristics of enzymes that follow michaelis-menton kinetics?

i wana ask that why cant we drink hard water,though normal water n hard water have same chemical properties??

I need help in design algoritem that check for a given Graph if a minimal spanning tree exist without a specific edge. Mean that for the original graph you find a minimal spannig tree and that spanning tree not include the edge and it is minimal spanning tree of the graph that do include the edge. The algorithm must run in O(|V| + |E|) when V - vertics and E - edge Thank for any help!

Is the HO radical a solid or a gas? In particular when it reacts with NO2 to make acid rain? Thanks )

I am awful at this stuff and i have a few question if anyone can help that would be great 1.A 20.00 g slug of Fe heated to 95.0°C was placed into 100.00g of water at 25°C. The specific heat of the Fe is 0.108cal/g°C. The specific heat of water is 1.00cal/g°C. What is the final temperature of the Fe? 2. A bottle of H2SO4 stock solution is 95% H2SO4 (w/v). Its density is 1.84g/ml. Find its molarity. How many millileters of the stock solution must be diluted to make 2.0L of 0.50-M H2SO4 solution? 3. For the following : H2 (g) ------>. 2H (g) ?H° = +436kj/mol Br2 (g) -------> 2Br (g) ?H° =+ 192.5 kj/mol H2 (g) + Br2 (g) -------> 2HBr (g) ?H° = - 72.4kj/mol Ca…