Homework Help

I am really stuck on this question i just got part a of it and now b is left. Mu= Weird friction symbol A box of a mass m=22 kg is at rest on a ramp inclined at 45 degrees to the horizontal. The coefficient of friction between the box and the ramp are "Mu s" = 0.78 and "Mu k" = 0.65. b) Determine the magnitude of the smallest force that can be applied onto the top of the box, perpendicular to the ramp, if the box is to remain at rest. Im having trouble drawing the Fapp arrow, so its messing with my equations. I'll post what i did so far. Fn= Fgy - Fapp Fnet=0 Fnet= Fgx - Ffs i'm pretty sure my Fnet equation is right. But i dont know about my Fn. So…

100g of a substance with a Specific heat of 0.1 cal/gCelcius put into a calorimeter containing 200g of water. The initial temp. of the substance was 250 degrees celcius and the initial temp. of the water is 0 degrees celcius. What will the final temp. of the mixture be? (ignore heat gained by calorimeter)

Is there any free/trial software that I can download that will enable me to draw up cumulative frequency curves.I tried doing this is Excel and it worked for values over 95 (on the X axis) but anything below that the whole graph included values all the way to 0 which made the data series very tall instead of being a curve. (all my values for the curve are between 95 and 120 in most cases) but some are lower and the graphs end up looking weird).

The qestion is: what is the direction of acceleration in these diagrams? Here are the options to choose from. I got: 1) A 2) A 3) B 4) B 5) A Which is wrong. So I changed 3 to E and tried it again, and it was still wrong. I dont see where my error could lay, so any suggestions would be appreciated.

My question is why increased production of respiratory and contractiel proteins are related to anaerobic respiration? Plz explain me in easy way. If there is a site that is about this ..plz let me know. Thanks~

Hey can some1 help me with writing net ionic equations? For a reaction between sulphuric acid and copper(II) carbonate, I think the equation is: H2SO4 + CuCO3 --> H2CO3 + CuSO4 but then how do I know which one ( H2CO3 or CuSO4) breaks into ions and cancels out with the reactans to get the net ionic equation?

Hey guys..im doing a project for school..but im stuck on a few questions.. (these are all based on the book The Chrysalids) First of all (just in 4 or 5 sentences) what is the difference between a blasphemy and offence? Secondly, It asks me what the "splinter incident" is.. whats that?! and thirdly, it asks for the defintion and sentence of: wraith, leeward, midden, germinate, and ethics. Thank-you very much! any help will be muchly appreciated!

hey all, i am having a bit of trouble with this optics problem involving whispering gallery stuff. here is the question: and my answer so far: for part (a) the critical angle of a ray going from air to some medium with refraction index of n is given by: [math] sin \theta_c = n [/math] so you contrcut a diagram such as this: from this diagram you can see that: [math] sin \theta = \frac{r-a}{r} [/math] setting this equal to the critical angle , we get: a = r(1-n) or a = |r(1-n)| = r(n-1) but then for part (b) i can draw a digram, but i don't really know what to do from there.... so can anyone help me out? …

Hey all, I am taking science in college and I am trying to do some homework. I have problems with two questions. I think 1. is G and 2. is E but I am not sure. Maybe someone can help me. 1. the 2nd Law of Thermodynamics a. is a restriction law b. states the total amount of energy in an y system does not change c. puts limits on the amount of usable energy that can be transferred d. states that the total amount of usable energy that any process transfers is less than the total amount of energy that went into the process e. the difference in the amount of energy put into a system and the amount of usable energy coming out of a system is called thermal energy f. …

hiya everyone im doing an essay about the rights and wrongs of animal testing for college and was wondering if anyone could help. It's due in on tuesday, if so could you email me your ideas at: tooty_fruity789@hotmail.com thanks

The question is: when two bodies with the same thermal conditions, is the average kinetic energies in those two bodies the same? The answer is their temperature is the same. And recall that their average kinetic energies isn't the same. I'm not very understand about this, I wonder to get an answer. What in my mind is the total average kinetic energy of all the particles inside a body is directly proportional to its temperature, so I think if two bodies have the same thermal conditions, then their average kinetic energies as well as temperature are both the same. Anything wrong in my above sentences?

I'm really stuck on this physics problem: A plane is flying at 130 mph, on a course S 20 E. The wind is blowing 30 mph due east. What is the final speed and direction? I know to begin with finding the plane in mph going North and East, but I'm confused on whether to use sin,cos, or tan. I'm also stuck on what to do next after that? It would be much appreciated if anyone could please explain what steps to take. Thanks!!

Hi all, i am having real difficulty doing this partial deriv. problem! would anyone be able to help me? (i am not even sure where to start really! ) Thanks Sarah

we had an assignment in biology and im a bit stuck the cell organelles are structually and functionally interrelated discuss this statement in relation to to the golgi body mitochondrion lysosome and rER......i have submitted my answer once and had it returned i have stated the functions and how they were related to one another im wondering if anyone else has anything more to add i know you cant see what i have written on my assignment im not sure what is meant by interrelated means in this context thanks to any-one who has an answer for me

What does this thing look like? When I draw it out I keep getting a carbon chain of >2... also, What does (Z) , (E) mean? different conformations?

This is a pretty basic question but I really need help with this! Thanks in advance! When an action potential invades a presynaptic terminal, it opens Ca2+ channels in the terminal membrane and this allows Ca2+ to flow from the extracellular medium surrounding the presynaptic terminal into the terminal. The resulting increase in Ca2+ within the terminal is actually what causes the relaase of neurotransmitter from the terminal during synaptic transmission. Supporting this model of the sequence of events that occurs during synaptic transmission, experimental data has shown that if the experimenter lowers the extracellular concentration of Ca2+ from 2mM to 1 mM to 0.5…

hey i have a question about this question .... ok so for interference maxima the equation is [math] dsin \theta_m = m \lambda [/math] , where m = 0,1,2,... now for the first grating (4000 lines/cm) and the red wavelength: [math] \theta = sin^{-1}(\frac{m \lambda}{d}) [/math] now my question is can i let m be anything i like or whats the deal? because wouldn't there be multiple (theoretically infinite amount) angles that construct interference could happen at? -Sarah

I need help with a question on my lab, im used to finding proportionality statements between sets of data and graphing it to get a straight line. But this question is different. Anyways heres the data i have. Oh ya the lab is on Centripetal Force frequency/Force 1.02 / 5 1.33 / 10 1.65 / 15 1.87 / 20 The slashes just separate the numbers so they dont bunch up. Here the question i need help on. Rearrange the data for the frequency in such a manner as you think will result in a straight line when plotted. Plot this data on graph paper#2. What is the equation for this relationship by calculating the constant of proportionality.

Hey i am having a few problems with this question related to optical fibres. or at least i think i am . if i put up my answers, could someone who has a little bit of free time tell me if they are correct? Thanks Sarah Here is the question: my answers are: (a) [math] L_2 - L_1 = 68.63 m [/math] (b) 1% © [math] F =( \frac{n_1 - n_2}{n_1 + n_2} )^2 [/math] , where F is the fraction of power that is reflected back. so since [math] n_1 = 1.459 - 0.002(0.5) [/math] and [math] n_2 = air = 1 [/math] the plugging this into to F gives : [math] F = 0.0348 [/math] so therefore the fraction of power reflected from the interface as a p…

Does anyone know any other forums that will help you pick topics for an essay? I have to write a comparative essay on the Handmaid's Tale and 1984. I don't really know what to write. Of course i have really finished reading the Handmaid's tale, but i want to pick a topic now so i can look for quotes. So can anyone please help me?

You're given a cable, weighing 2lb/fot, that is used to lift 800 lb of coal up a mineshaft 500ft deep. find the work Help me finish this problem, please! [math] \int_0^500 [(800+1000)(9.8) ]X \ , dx [/math] Is this right, is it worth it to solve?

Does anyone here know how I would quantify a decomposing earthworm. I need to know for a biology project in which I am trying to prove that nematodes aid in decomposition.

tan(θ°) = (viv) / (vih) = (1.28 ± 0.0676m/s) / (0.514 ± 0.0676m/s) = 2.55 ± 0.467 m/s θ° = 68.0 ± 3.65° This answer may not be correct to the decimal place but it shud b relatively close. Could someone plz explain to me how 3.65° becomes the uncertainty for the angle? Plz. explain very clearly and simply. Im in a hurry. THanks in advance

Hi! I need some help from somebody, who has English mother tongue. My wife has to write her thesis for the University in English, and she can make max. 20 mistakes in grammar. So is there anybody, who takes on to check it in grammar way? Just read it (approx. 50-60 pages), and correct the grammar mistakes. Thanks in advance! Sirp (from Hungary) peganrobert@yahoo.com PS.:sorry for my poor English

I really need help on these types of questions. So please help if you can. A swimmer who achieves a speed of 0.75 m/s in still water swims directly across a river 72m wide. The swimmer lands on the far shore at a position 54 m downstream from the starting point. (a) Determine the speed of the rivers current (b)Determine the swimmers velocity relative to the shore ©Determine the direction the swimmer would have to aim to land directly across from the starting position I have no clue on how to start this question because they give us speed when they want velocity. So can anyone please help me start this question