Homework Help

1. You have been given an infinite number of ropes. All ropes are of varying length. If you burn any single rope such that it is lit from one end (and allowed to go on till it reaches the other end), the total time the rope takes to get burnt is one hour. Some parts burn faster than the others. Now a person comes along and claims that he can use this ‘burning ropes ’ method to exactly measure time of one hour and 15 mins (75mins). He doesn’t use any other method, source or tool (besides burning and observation) to measure time. How would you do it if put in the same situation? [Hint: You can burn ropes simultaneously] <br style="color: rgb(40, 40, 40); font-family: hel…

So I've noticed that based on problems I've worked on, whenever the degree is known, for some reason I should automatically assume there's a unit circle involved, and when the degree isn't known and the angle is just left as theta, then the problem is for some reason automatically talking about degrees instead, but I have no idea why. So what if the angle is known? I don't see a unit circle magically appearing when I'm measuring the angle of a window or whatever. It's something like this, it's not identity, it's just trigonometric functions. Givens: sin30°=1/2 tan30°=√(3)/3 What I need to find: a. csc30° which on a unit circle is 2 b. cot60° 3…

Why are nitrates, magnesium and phosphorus needed in plants and what are their functions?

Hi, This question asks which of the following best describes the function of proteins bound at the proximal promoter elements in eukaryotic genes? a. The bind to RNA polymerase subunits b. They bind DNA as well as proteins c. They play catalytic roles in transcription d. They unwind DNA to promote polymerase binding e. Their roles are only for activation of transcription The answer is ap…

Hello, Any help will be appreciated. Q:Determine moles of dichromate ion that reacted with iron(II) in titration (use average volume). My A: 0.0119mol 6 Fe2+ + Cr2O72- + 14 H3O+ 6 Fe3+ + 2 Cr3+ + 21 H2O 4g-Fe2+ 4g*(1mol/558.845g/mol) = 0.0716 moles of Fe (6/0.0716)=1/x x=(0.0716)1/(6) x=0.0119mols of dichromate. My questions are: 1) am I way off in my approach? 2)Why does the question want me to use volume? It seems that it should not be this easy so I assume I am way off. Also the avg volume of Fe solution 6.75mL and the concentration was =0.102mo/L. -----------------------------------------------------------------------…

Is phosphorylation and substrate-level phosphorylation the same thing?

A calorie is the amount of energy needed to raise 1g of water 1 degree, so does that mean that colder foods would take more energy to digest as they have to be raised to body temperature from say frozen or something? I know that a food calorie is really 1,000 calories, so the difference wouldn't be too great, but is there a difference at all? What about eating food that is very hot, would that result in more caloric intake?

I have a list of questions I have while studying for my coursecalled Introduction to genetic engineering ad I have a couple of questions ihope I can get answered. Thank you 1. When making mRNA to DNA, we use reverse transcriptase. Whenthe cDNA is made and we remove the mRNA by adding alkali. Is the complementaryDNA strand now made using DNA Polymerase I or III? 2. In genetic engineering, when a recombinant dna enters a hostcell, it either integrates, disintegrates or remains as an episome. Does thereason it disintegrates is because the host cell can detect it doesn't have thesame methylation sequence and cuts it via host controlled restriction?? …

So if I have A=xe^rt for a continuously compounding interest equation, then according to the calculator that is also equal to xLn(A)=rt, but when I solved for it using real numbers, I didn't get the correct number. The known info is the initial amount is 750, and after 7 and 3/4 years, that amount doubles, I have 1500=750e^r(7+3/4) yet when I solved for it 750ln(1500)=r(7+3/4) ---> 5484.915=r(7+3/4), then /(7+3/4) and I got 707.731=r, and since I'm suppose to find out how much I will have after a specific amount of time as well, and I can't really go backwards in time, this doesn't work. Basically, I am trying to solve for the annual rate, but it's no…

I'll be taking beginning calculus this upcoming (Spring) semester and, as I am only a recently returning student, what math skills i do possess have been a-gathering dust on the shelves, no doubt in some musty recess of my mind. Are there any books or sites anyone knows of which I could use to brush up on the trig and pre-calc materials I'll want to have down before my class begins. I'd really appreciate any suggestions here. Thanks

Hey, Im doing an assignment from my org.chem. class, we are using the OWL cengage website. Im supposed to show the second step in aldol condensation, but i cant get my arrows to go where i want. the second step is when the 'negative' C goes to the 'positive' C and the double bond goes up to the O right? if im explaining it in a weird way, sorry.. but i cant figure it out and its driving me insane. or maybe ive misunderstood the second step... anyone?

I want to clarify that this isn't a problem I have to do What divides a non-septate fungus into cells?

Hello, There is no information in our textbook about this question, so I was wondering if anyone could help me answer it: The patient is a 28-year-old female with insulin-dependent diabetes. She developed viral gastroenteritis with nausea and vomiting. She did not take her insulin and she became increasingly nonresponsive. Her husband called 911 and she was taken to the emergency room. Her pulse rate was 128 and her respiratory rate was 28, deep, and smelled fruity (Kussmaul breathing). Her urinary glucose and ketone levels were both 4+. Her pH was dangerously low. Explain how the body attempted to compensate for the low serum pH. TIA

Hi all I have been give a hypothetical situation where a spontaneous mutant mouse was identified with muscle wasting in the limbs. I must discuss how the mouse disorder could be used to study human disorders and I am assuming this relates to muscular dystrophy. I'm not yet sure how to tackle this and which steps to follow but I do know I must first find out if the trait is stably inherited. Which genetic crosses would I have to carry out in order to do this? The spontaneous male mutant could be crossed with a female to see if the trait is still present in some of the offspring but is this all that would have to be done? Is that sufficient proof that the trait is stabl…

I'm not sure how to start this question. Can someone please assist in explaining how to approach the problem? Find all the zeros of the polynomial function by using the given zero p(x)= 4x^3 + 23x^2 +34x -10 Zero:-3+i

carbon, hydrogen, nitrogen and oxygen. where do organisms get those elements?

I have to do a poll for homework, so if anyone would like to participate, here is the link: http://www.misterpoll.com/polls/538629 There are various questions regarding cellphones and regulation. Thanks!

If I could get a homeopath or someone aspiring to the feild to answer these questions that would be great and mean alot. 1. What does homeopathey entail? What does a homeopath do? 2. How does one become a homeopath? What is your particular education background, including: colleges, internships, lab practice, etc. 3. How does homeopathy help people. What about the practice contributes to the optimal holistic health of a person? 4. What is your perception of traditional vs. non-traditional medicine?

Hi, I'm new at all this but I have a growing interest in Physiology, and have a question... In relation to the central system (Limbic), does the Pituitary receive signals last and then reciprocate ? At a glance, the Pituitary hangs in relation to the Hypothalamus which is connected to the rest of the central system mainly being the Thalamus and Hippocampus, including optics and frontal lobe etc. But my question being, could the connection with the Amygdala / Hippocampus & Thalamus be described as a pre-cognition to the Pituitary ?

Hi, I found this website to help me figure out gene mapping: http://www.brown.edu/Courses/BI0020_Mill… I know how to figure out the parentals. I just pick out the row of phenotypes that are in greatest number. That's the 417 and 430 right? However, how do I know which numbers (this under "gene mapping-an example) will show me the distance between sc and ec, and which ones will show me the distance between vg and ec? i.e. how do I know which numbers I'm plugging into the map distance equation correspond to the distance sc to ec and which ones for vg to ec, how did they choose those!

I am a Chemistry major and am also looking into the feild of biology and Neurobiology as well. I have an assignment that requires me to interview someone in this field the following questions: 1. What does cellular neurobiology entail? What does a cellular neurobiologist do? 2. How does one become a cellular neurobiologist? What is your particular education background, including: colleges, internships, lab practice, etc. 3. How does cellular neurobiology help people. What about the practice contributes to the optimal holistic health of a person? 4. What is your perception of traditional vs. non-traditional medicine? I promise any information given will be pu…

Has anyone seen an atom yet, in real?

Using the For,While,If loops: This is what I have so far, I know that I'm looking for t when A is at or above $50000 but I'm a bit stuck as to how to set it up so that it will calculate A for each t from 1 through 99 and than store that value of t. the loop will end when A is 50000. /working

The question r = 1 + sint Find the points on the cardioid where the tangent line is horizontal or vertical. I get dy/dt = (cost (1+2sint)) = 0 and dx/dt = (1+sint)(1-2sint) = 0 I can see for dy/dt you get pi/2, 3pi/2, 7pi/2 and 11pi/6 and for dx/dt you get 3pi/2, pi/6 and 5pi/6 I am struggling to remember how to find the r coordinates of this. Do you substitute the points back into the original equation? You find (2, pi/2) ; etc. I just need to know if that is how you would get the r coordiante. If someone can help it would be appreciated.

Hello, I need to measure (max) contact force in liquid environment in a shrinking body. I have to choose a method with an object to measure it, and it ought be inch max size. My ideas are: - Object that would destruct under definite force - Object with wireless sensor - Object that would change temperature or light intensity under pressure Any suggestions would do