question Definition and 64 Threads

since euler's identity states e^pi*i+-1 is it okay to write down e^pi*= e * -1/e = -1 and would for integers the same rule apply where a^pi*i= a * -1/a = -1 or is it only for the constant e? this might be a stupid question, but i cant find an answer and im curious

Where can I ask financial math question in this forum?

I had a question in my mind about PCBs. Printed Circuit Board (PCB) is a non-conductive material with conductive lines printed or etched. Electronic components are mounted on the board and the traces connect the components together to form a working circuit or assembly. Now a Pencil has...

[Thread moved from the technical forums to the schoolwork forums] Let's suppose we have a ring with radias R and radius of the cross section r. We start rotating with an angular velosity w. We will there be an induced EMF in the ring and how can i find it's value?

Hi! I have a loss head question. There is a difficulty in understanding the hydrodynamic loss head concept. Assuming that there is a one-sided tube with incompressibility, visibility, tube friction coefficient and cross-sectional area A.. There is friction in the loss head formula, but is the...

what is the problem ? if want ask a Q alkl i get is enter some thread

The question and my attempt at a solution are attached. Thanks.

The Q My "working" The answer is simply 2820 N

I have attached a screenshot of my rough work. First of all, is my interpretation of the question correct? Please see the diagram in purple. To me, this makes sense because a=v^2/r is the only equation from my coursework that seems to relates radius (which you can find from the length of the...

The question What I did The answer

The Question What I did The Answer

Will post a question and view responses

Question: My answer: The books answer:

Hello esteemed members, Recently I have been using this site for getting help, and I have found it very helpful, thanks to the helpful members who I may not be able to thank them fully. However, part of my method of studying is to do a self-contained study guide or summary or notes... to the...

consider a giant planet have a 3/4 mass of it sun and with the distance of 50AU from the sun. does the planet revolve around in a elliptical orbit because the mass of the planet is high so there barycenter is half the distance between them so it look like binary star system but the question is...

s1=-u1^2/2a1 s2=-u2^2/2a2 s2>s1+d (If distance the car stops is bigger than the distance the lorry stops plus the initial distance then they will crash) (sub s1 and s2 in) -u2^2/2a2 > -u1^2/2a1+d Switch 2a2 with whole left side of equation. -u2^2/(-u1^2/2a1)+d > 2a2 Make the (d)a fraction by...

I don't understand what the question means, and the answer is provided here: https://physics.stackexchange.com/a/35821/222321 Could someone provide a comprehensive one-by-one explanation.

I tried to construct a diagram, but to no avail, since I don't really understand the qn. However, my professor provided me with this graphical depiction (that i obviously don't understand)

Hi. I have a problem I'm trying to solve. I have a tarp that is stretched horizontally across two walls. The walls are 5.5m apart and 50m long. There is a pressure of 10mBar above the tarp pushing it down, making it sag about 0.15m in the center. I'm trying to calculate the force with which the...

What I did was split the problem into two seperate summations based on x & y coordinates: Tcos(25) - Tcos(55) - Px = 0 Tsin(25+Tsin(55) +Py - Q = 0, Where Q = 1860 I initially got an answer of 2391N, but it keeps marking me wrong for said answer. This is the free body diagram, (the previous...

(mentor note: moved from Classical Physics forum hence no template) Hello, I am having trouble with this question: Imagine in real life there was a coefficient of kinetic friction of 0.4 between the plastic wheels of the cart and the wooden ramp. If there is only friction on the flat part of...

I need to understand the mechanics involved in performing a wheelie. That includes analyzing the free-body diagram. And considering all the factors involved in performing this manoeuvre in motorbilkes.

Hardly anyone would think of this solution. I even wonder how anyone would come up with the question. And it is even more amazing that the questioner and solver were not the same person.

Mixing bleach(clear) and nailpolish remover(green) makes orange product at first but after a few minutes of stirring turns to a pale hello color. What is happening in this reaction (is it the bleach and acetone or also father ingredients in nailpolish remover) and did I just make chloroform...

Being sentient has its very complex thoughts.Think of this:- Why am I sentient; why do I have the ability to control myself?- Out of all the sentient beings in this world (including all other life sources) why am Iwhoever I am, being somebody else is no different, so why is it me?- How did me...

An Engine absorbs heat at a temperature of 727 deg-C and exhausts heat at a temperature of 527 deg-C. If the engine operates at maximum possible effeiciency, for 2000 J of heat input the amount of work the engine performs is most nearly:a. 400Jb. 1450Jc. 1600Jd. 2000Je. 2760JThe correct answer...

Is it true that the Uncertainty Principle applies to macroscopic objects as well as things like electrons and photons? If so, why don't you ever see your computer monitor or perhaps your mouse flitting around on your desk?Spencer

I have a problem with a grade 11 physics question and am looking for assitance. It is...A rotating 8-sided mirror is used underwater(n = 1.33) to accurately find the speed of light in water. The mirror rotates at 660 Hz and red light with a wave length in air of 720 nm is used. How far away does...

Hey,I'm trying to answer this question which basically says that if a mass of 8Kg is raised to a GP of 4.5x10-3JKg-1from it's current position X, what would be the work done?I have managed to answer that the it goes on to say that if the mass raised to the same potential from it's current...

For Physics class, I need to find out why, when life forms developed on Earth, did they all become sensitive to the small visible spectrum? Why didn't they become sensitive to infared waves, for example?

A man is pushing a shopping cart full of food, applying a force at 25 degrees above the horizontal. The cart and its contents have a mass of 26.2Kg. He pushes the cart with a constant velocity and an applied force of 302N [25degrees abovbe the horizontal]a)What is the magnitude and direction...

If i submerge a golf ball in hot water, how do i find out the rate of heat transfer? or how do i find out the time required for the water and golf ball to reach the same temperature, provided that the material of the golf is known?

A balloon with the mass M is filled with air with the mass 4M. The balloon lies in vacuum on the ground until its bottom is punctured and air leaves it downwards in a constant air speed U relative to the balloon.What should be the air ejection rate (mass loss as a function of time) so that the...

I was recently involved in a speculative discussion about the characteristics of a journey through a hole drilled through the center of the earth.The question is this: if there was such a hole, beginning on one side of the earth, running through the center of the planet and appearing on the...

I have this review sheet. It's got 5 questions. I'm probably going to ask about all 5, but I want to at least try them first. Here's the first one:What distance should engineers plan for an on ramp to an interstate where the vehicle initial velocity is 5.0m/s, the final velocity is 32m/s, and...

Hi,I'm still doing high school physics and I've been trying to figure this out myself for almost an hour but I have no solution so I came here and thought you might be able to help :) so I'm sorry if this is a simple question to you guru's :)Well I have this problem:There is a cannon, pointed...

I cannot see how to do this exam question:Estimate the average time taken by an engineer to reach the lighting unit of a street lamp from ground level, if the electric hoist is powered by a domestic mains supply. [5]I dont want the answer, i have the answer already on an answer sheet, but...

The Fantasy of First-Person Science- Daniel C. Dennett, Center for Cognitive Studies, Tufts University.(a written version of a debate with David Chalmers, held at Northwestern University, Evanston, IL,. February 15, 2001, supplemented by an email debate with Alvin Goldman)A week ago, I heard...

Anyone know the answer to the following question:A positively charged particle is moving northward in a magnetic field. Themagnetic force on the particle is toward the northeast. What is the direction of the magnetic field?a) upb) westc) southd) downe) this situation can not existI would...

Well,Some member of physicsforums (not sure who he is) sent me an email with this question, he doesn't know how to send diagrams, so i uploaded the whole question for him.here is the linkhttp://www12.brinkster.com/staii/PF/1.docHope you can help him'i don't know i just think i do'[The Crown Holder]

Hi,I've been trying to figure this question out but am having no luck.Here's the question first of all:"Where between the earth and moon would you be truly weightless?" (The distance from the earth)Givens: "my" mass = 100kg Earth mass: 5.972x10^24 kg Earth Radius: 6378000 mMoon's mass...

I asked about how the whole stars before the sun thing to a Christian on a forum. This is the response I got :|"God is so great! I just know that He is perfect in every way.We are to take care of the earth. We have not always done a good job of it.When I look at the majestic mountains and the...

Would a resultant of 45degrees to the horizon component of vector be larger than the horizon component and vertical component? If yes, by how much?

Hello, I'm new to the forum and fairly new to the concepts of physics. I had a question. There is a particular problem in my text book that I don't agree with, and i'm hoping some of you can help me clarify this. The question is, if an ice cube is placed in water, will the level of the water...

Hi,I've been trying to figure this question out but am having no luck.Here's the question first of all:"Where between the earth and moon would you be truly weightless?" (The distance from the earth)Givens: "my" mass = 100kg Earth mass: 5.972x10^24 kg Earth Radius: 6378000 mMoon's mass...

I am a rock climber and have been scouring the web for a converter to figure out a problem I have found. I want to know if there's a formula where I can plug in the rated force of a paritcular piece of climbing protection (lets say 5 kilonewtons) and plug in my weight (lets say 75 kilograms) and...

Any help would be greatly appreciated.AP Statistics scores on the test covering random variables are described by the following porbability distribution.Score 40 50 60 70 80Probability(Score) .1 .2 .3 .3 .1So if you use mean = x = xipi= 61and variance =2x =...

I saw a documentary once about some experiments that had been conducted at zero gravity. I do not recall all of the details, but I remember that they had several objects some were spheres and others were other shaped objects such as squares or pyramids.They would release 2 spheres and they would...

What is the functional difference between a ceramic and electrolytic capacitor? I remember going over that as an undergrad and I'm trying to rule that out as a source of problems here at work, but don't have much in the way of resources right now (though I'm currently checking on the internet...