Homework Help

I used the kinematic equations To first find mass from the k.e given And in the secound part I used the mass to calculate the new k.e .... I attached my working

My working is beneath question

I am literally clueless about this question.. the only thing I understand is the rate at which motor works implies power . And its rising at steady speed .so maybe the kinematic eq will come in handy.... how do I get started

the efficiency of a buffer in resisting changes in pH upon addition of base or acid is referred to as the buffer capacity. one way to define this quantity, which we shall call B, is B=dx/dpH, where x is the number of moles of base added to weak acid. Note that the HH equation may be rewritten as pH=pKa+ log (x/A0-x) where A0 is the total concentration of acid. obtain an expression for B, in terms of A0 and the fraction of acid titrated, f, where f=x/A0. hint: it's easiest to determine dpH/dx and take the reciprocal this is problem 14 in ch 2 of biochemistry ed. 4 the correct answer is B=(A0/2.303)f(1-f) I thought the answer was just to take the pH formula and u…

A 3.50 kg ball with a velocity of 10.00 m/s collides with a stationary ball with a mass of 5.00 kg. After the collision, the first ball travels at a 42.6 degree angle from its original path, while the second ball travels at a -26.7 degree angle from the other ball's original path. 1) What is the momentum of each ball after the collision? 2) What is the velocity of each ball after the collision?

And this time I have no idea even how to start the problem. I just know one thing I DIRECTLY PROPORTIONAL TO R^2 and the other formulae relating radius is given in the question..... now how to I relate both of them

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