Homework Help

Two parts are correct ... A ) INDEED the speed of electromagnetic waves in vaccum is same.... 3×10^8.their speed only changes when medium changes. D).THE FREQ of infra red is greater than u.v ... Now how do I go about this problem

My approach for this question is.. The disp time graph will give us the speed .. the speed will give us kinetic energy 0.5mv^2 . Now the disp time starts with a negative displacement. ..the particle at that point will have a gradient (speed) negative . .. but in the k.e eq the sped gets squared .. therefore the first kinetic energy must be positive having some value.... crossing part B AND D which start from zero.... now how do I chose from A AND C.... if my thoughtprocess is correct ...

I solved it this way and flunked :/

Hey guys im back with straight pictures this time .... so happpy :D .... anyways this question I tried the same old Q=IT... but this seems like a trick question. The question at the bottom of the page

I found P OLD and P NEW.. in forms of resistance. ... how do I relate both of these?

In these kinda questions my teacher taught me whenever the galavanometer shows zero current the voltage frm both batteries must be cancelling out .. I.e the emf of above and down battery both is same .... clearly the ans is B .. BUT what I wana know is how do the voltage gets cancelled? Thats not possible right a tiny charge carrying energy on it how can the energy disappear?

My calculations dnt seem to follow any of the graphs.. at 0.5 its not zero which crosses C and D .... THE POWER IS INCREASING ... which aint in any part

I said since the external resistance is increasing . The overalll current in circuit must decrease bcz R=V/I. ...the external resistance is increased and the current is decreased ... the voltage be same as the increase and decrease cancels out (maybe) ... part A cancelled .. PART B cant be right instinct... Which leaves me with C and D AND I.DNT UNDERSTAND BOTH OF THEM

Hi there .. I dnt have a homework question ... however I would appreciate if someone could tell me how to rotate images once you attach them. So heres the problem : I take pictures of my questions frm my cellphone which are straight however whenever I attach them on the forum they automatically( magically) get 90º rotated/tilted....cant find any option which will them rotate them back. I have many questions along with my solutions just need little guidance ... thanku

Can someone point my mistake? Not getting the ans .

What do I do next? What is the extention. Can I add the young modulus together to get the youngs modulus of the rod?

Hi Guys/Girls I require your help or assistance with the following Thermodynamics Assignment. I have a few ideas however my solutions are incomplete. The assignment questions can be seen below in the image. I have attempted questions 2 and 3 and would like to know if I'm correct / along the right path. My solution __________ 2) With reference to the question about the compressor I've taken 100% efficiency to mean , fully reversible. assumptions : steady state and adiabatic. I've assumed that air is an ideal gas throughout the compressor. change in entropy = 0 change in entropy of an ideal gas = 0 ( to calc the exit temperature of the compre…

What approach should I use in solvinh this question. Phosphorous mass dividedby total mass multiplied by 100 isnt giving me the ans.. im clueless even dnt know how to begin . Kindly givee me a slight hint

Greetings to everyone, I am currently a HS senior following a program where I have to study independently at home and attend school for tests and exams, and I also have a limited opportunity to interact with the teachers. My Maths teacher, specifically, is very reluctant to respond to my questions via e-mail, as well as I do not have anyone else to ask for guidance regarding some calculus problems. Of course, I do not mean to offend my Maths teacher, it is just the way it is and I must find a way to perfect my knowledge without it. Some of the problems surpass HS level Maths and are not required for examinations, so I am unable to find guidance through the books I have …

I took using avagadro no I took out the particle as 3×10^-21 ÷ 6.02×10^23 . Shouldnt this give me the ans?

I have no inkling how to solve this question .I know the concept of partial pressure is required here . But I dnt really undestand the gas laws and partial pressure if someone could help me plzz....

I tried solving this question A gets canceled out bcz the ion Ch2CO2CH3 is not present D gets canceled out bcz its a tertiary compound Camt figure out is it b or c

C and d get cancelled out . But the mass no and melting point both are increasing.

I need help understanding these graphs for a project: And if needed, attached is the scientific paper its from. ncomms4242(1).pdf

#1 During heavy exercise 2.0 liters of blood are pumped to the surface of a person per minute to carry away core heat. If the blood is cooled by 3.0°C at the surface, what is the rate of heat transfer in watts due to blood flow (force convection) . You may assume that the specific heat of blood is the same as that for water and that the density of blood is 1.05g/cm3. Note that although the core and skin normally differ in temperature by 3°-4°C, the blood will not be cooled by that much . Skin temperature will rise during exercise and the blood must have a greater temperature than the skin in order to transfer heat to it through vessel walls (conduction). Please provide fo…

I have worked on these last two Unknown compounds for a total of 6 hours now and cannot seem to come up with an expanded structure. Can anyone help me it is really crucial I figure this out I have spent 6 hours trying to figure this out today instead of studying for my Organic 2 exam I have at 7:30 tomorrow morning please help. This problem set is also due after my 7:30 am exam ugh.

This is my homework question: Explain the principles of heat energy transfer from one body to another with reference to the following terminology. Temperature difference, Enthalpy, Entropy, Coefficient of heat transfer, Specific heat transfer, Conduction, Convection, Radiation. This is my first week in this class and basically I have had no previous education in this field of thermodynamics or anything related really =S Please my excuse my stupidity. In this forum question I just want to cover Entropy and Enthalpy. This is what I have written so far and I am not sure if I even totally understand this. My questions: 1) ... struggling. Is this enough for…

So, after countless hours of working on my review sheet, I have finally thrown in the towel and decided to ask for help, but not from my professor because he's not very helpful and he's been using the same exam since 1994, and yet there has never been an answer key posted anywhere. So, the students could be doing the review sheet completely wrong and we'd never know.. but, that's a complaint for a different forum. I did 39/50 questions, but I'm stumped on 11 of them. Help would be much appreciated. Thanks! The exact code needed for the synthesis of all the enzymes a cell or an organism can make is ORIGINALLY found in: A. all of the genes possessed by that …

ANY OF THIS CORRECT ? Hi, I'm trying to understand fluids for past 3 weeks but i doesn't go well. can any one help me ? explain it somehow. maybe one of the examples i have. im not asking to for the answer but some kind of formulas of the way to do it ... A piece of wood of mass 4.8kg is 350 x 600 x 300mm thick. When it is floating water, how much of this thickness h is submerged. Calculate the upthrust on the wood and its apparent weight when floating in water? If the top of the wood and the water surface are at atmospheric pressure, what is the pressure at the bottom of the wood and total upward force generated at the bottom the wood? In order to bring the top ju…

For deuterated NAD2H is the first metabolite of gluconeogenesis to incorporate the label G3P? 1. Asked to calculate the moles of protons pumped out of the mitochondrial matrix per mol of FMN molecule as electrons are passed on to coenzyme-Q. First I used this equation: ∆G = -2.303RT(pHout – pHin) + ZF∆yto calculate kj/ mol of protons and that's where I got stuck and don't know what to do next and ∆Gº’= -73.3 kJ/mol ∆pH= 1.3 ∆y= 0.18V and T= 37C. Please help! 2. Asked to calculate how many molecules of FMNH2 need to get oxidized to make 450 g ATP. DG for hydrolysis of ATP is -50.2 kJ/mol and the efficiency of ATP synthase is 40.2% and MM of ATP= 503.15g/mol. F…