Homework Help

Q: is it true that when it has lightning mushrooms grow?

Hi, I am doing an assignment for my final project for my Open University Chemisty degree. I am doing it on cellulose bionanocomposites. I'm doing ok with the "normal" chemistry but I am struggling with some of the materials science. Some of the papers I have researched report upon the "strain-to-failure" of the bionanocomposite films they have produced. I know that strain-to-failure measures the amount of strain a solid material can withstand before it "fails", is calculated from measurements gained from stress-strain curves and is expressed as a percentage. What I don't understand is what the percentage is actually measuring - what is it a percentage of? I have perfo…

The average concentrations of bromine in seawater (d=1.024g/mL) and the Dead Sea (d=1.22g/mL) are .065g/L and .50g/L, respectively. What is the mass ratio of bromine in the dead sea to that in seawater? I have no clue what to do here. The answer is 7.7/1 but I can't get there. Is this testing significant figures? EDIT: Wow was I overthinking this. Just divide the two concentrations to get 7.69 which is 7.7..... don't I feel foolish.

What materials do I need to make algy grow and sustain it? Anything else like temperature control or is there a certain type of water i should be using?

We had a quiz and I got one of the questions wrong and it had to do with the Tollen's test. I missed the lecture on this topic and my book doesn't do a very good job of explaining it. I've posted the question followed by the general equation for the test, which I understand. It converts an aldehyde to a carboxylic acid. The problem I'm having is applying it to something that's in a chair conformation... there is no aldehyde. Can someone show me what the product would be and explain why?

"what is RADIX? give Radix of machine coded instruction." kindly help me to answer this.thanx

The function φ(x) = a(sin 2πx/λ) + b(cos 2πx/λ) represents the superposition of two harmonic waves with the same wavelength lambda. Show that phi is also harmonic with the same wavelength, and can be written as φ(x) = A sin((2πx/λ) + α) where A = √(a² + b²) the best I can come up with is φ(x) = A sin ((2πx/λ) + α) = (√( a² + b²)) (sin(2πx/λ) cos α + cos(2πx/λ) sin α)

Hi, we have a project due that must meet the following criteria: Egg Launcher Must be a stand alone operation. Has to deliver a single egg over a distance of 20 ft. Egg--Grade Large A Egg must achieve a minimum height of 10ft Egg must achieve free flight for at least 10ft Egg must be "released" by the system at a height of no more than 2ft Egg must land and remain in a circular target area with a diameter of 3ft. Egg must remain UNBROKEN 50% of the egg must be open to the air and visible. The system must be reusable and have a "refresh rate" of nor more than 3 minutes. The system must come packed such that it can be dropped from a distance of 4ft and still…

With respect to the engineers day on september 15th, we need articles about engineering..! I have only 2 days time...Can anyone help me please. please i have no time to prepare myself..

Hi I am trying to solve this i really help .anyone i would be thankful. Fluid of specfic gravilty 0.06 flow in a long vertical 2.56 ^10-2 m diameter pipe with average velocity of 0.15m/s .if the preasure is constant through the fluids,what is viscosity of fluid? assume laminar flow/ i) Determine the shear stress ii) Viscosity of the fluid iiI) Dertermine Reynolds numbers i tried that i used my best to put reymonds number which is shown in following link. http://en.wikipedia.org/wiki/Shear_stress but i couldt . i hope you would be able to help me thx.

So each year i ask you guys for possible project ideas for me. for school. This year i was thinking of doing a project on Thomas Morgan Hunt and sex inheritance but i don't know i did decapentplegic homology last year and that ran around that sorta same theory. Basically, i need something in advanced biology maybe one of these: Phrenology the derivation of a persons character traits from shape of skull Mycology fungi Algology algae some project ideas and suggestions would be great! thanks ya'll

Hey .. I Want Know ... the solar system planets, consisting of 8 without Pluto or 9 with Pluto . and why? Kind Regard Mr.Ayman:D

Hi everybody i have already posted this question but it seems that i didn't chose the adequate forum so here is it again(i hope i'm not doing a mistake!) I have a question about a solar-assisted cooling system ,used to cool milk The systeme basic components are electric compressors and an absorption machine, When optimizing the compressor cycle, by lowering the temperature in the condensor, an important saving of energy can be made...........this lowering is the result of the introdaction of the absorption machie ............; my question is: how does the lowering of temperature in the condensor influence the electric energy consumption? i mean how could it b…

Hi, i was wondering if I could get some help on a question with physics? the question is: An athlete, commencing at a point due east , completes half a lap of a 440 m track in 25 s. Determine the athlete's a) average speed b) average velocity ( in a westerly direction) c) average velocity if the athlete completes one full lap at the same pace I get how to get a) and c) but i dont understand how they got an answer of 5.6 m s^-1 W. Please help me!

If there is somewhere online I can find the complete genomic sequence of Vibrio furnissi? How to prepare Mycobacterium smegmatis for long term storage at -80 degrees C? These aren't actual Homework questions. I am doing research under a doctor at my university, and also helping her with cultures for her lab class. But this forum seemed the most appropriate for these questions. If you can even point me in the right direction, I would be grateful.

hi i m trying do this question but i just dont understand how .i would be thankful if someone guides me . 1 :- The wall shear strees ina fully developed flow portion 0.3m diameter pipe carying water is 89 pa. dertermine the preasure gradient(Pa/m) if the pipe is a :- Horizontal b :- Vertical with flow up or c :- Vertical With flow down. 2:- A viscous fluids flows in a 0.10m diameter pipe, such that its velocity is measured 0.012m away from the pipe wall si 0.8 m/s. if the flow is lamiaar. Dertermine the center veocity Dertermine the flowrate/. Thanks .

I have an assignment on Fractals, but I am unable to find much helpful info on them (research based assignmnet, it wasn't that I wasn't paying attention in class). just a brief deffinition will be sufficient. Thanks if you can help. info on mandelbrot sets and julia sets would be nice too if you can give me some.

i was working on an identification of functional groups lab and was doing a chromic acid test on an unknown - it was soluble in water, had a neutral pH and bright orange precipitate for the 2,4 D test - all was fine UNTIL - i did a chromic acid test to determine whether it was an aldehyde or ketone and it turned dark murky brown and got pretty hot - not what my lab mannual said it was going to do and not the reaction caused by my known compounds - i tried again, thinking the error was my own - the second test produced the same result - i have surfed around trying to find an answer - no luck - my prof identified it as an aldehyde and now i'm wondering why not green - i can…

Vitamin C has a pk of 4.2. According to the Henderson Hasselbalch equation how much of vitamin C in human blood (ph = 7.4) are protonated? I have a kind of an idea how to work this out but cant quite get there, a little help would be much appreciated Thank You

Hey all, here is a problem that I have for homework and I can't figure it out. Any help will be appreciated. a 1650kg car accelerates from 15.9m/s to 28.1m/s in 8.31s. a.) what is the work done on the car? b.)what is the average power umed during acceleration? c.)what is the average force accelerating the car? So I know I have to use... Work = change in kinetic energy = 1/2 (m)v^2. Then what? Thanks ahead of time!

hi there... my sister was given an assignment that has caused all sorts of problems in my household. her assignment was to have a brush that if not used by the owner the brush gives off little electric shocks. i was thinking static electricity, but how do i charge it and have no clue where to start. http://www.scienceforums.net/forum/images/smilies/doh.gif so to all the brilliant minds out there help me please http://www.scienceforums.net/forum/images/smilies/redface.gif what i need to know is how can they give such assignments with so little time HELP ME PLEASE

The mass of AgNO3 dissolved in 300 g of water in a beaker and then heated to 50°C is: A) 152 g. B) 246 g. C) 455 g. D) 1365 g. How do you figure this out? Can anyone help or perhaps provide complete working out?

Which of the following alternatives contains only water soluble substances? A) Potassium chloride (KCl), and (SiO2), ammonia (NH3). B) Sodium nitrate (NaNO3), and glucose (C6H12O6), hydrogen chloride (HCl). C) Barium hydroxide (Ba(OH)2), salt (NaCl), ethane (C2H6). D) Iron (II) oxide (FeO), ethene (C2H4), ethanol (C2H5OH). I am confused! I do not know how to work this out...I don't think we have even covered this in class. How do you know what the answer is? Could somebody elaborate please on how you got the answer?

Suppose a straight hair lined man whose parents had a widow's peak marries a widow's peak woman who father had a straight hair line a) What percentage of their children would you predict will have straight hair lines? b) what is the possible genotype of the woman's mother? c) what are the genotypes of the man's mother and father? 2. The trait for puple hair (P) is dominant over that for green hair (G), w hich in turn is dominant over that for orange hair (O) P>G>o. The trait is X linked. Avigdor, a male, who has green hair, marries Clarinda, who has purple hair, not knowing that Clarinda's mother's hair was a bright shade of orange. a) wha…

Help!! how many atp are produced in the krebs cycle???