Max Definition and 1000 Threads

Any one knows a simple way to prevent an increasing current from going above a certain value? Current is increasing over time. Only when it reaches a certain value then I would like to stop it from going above and keep it at that Max value . thank you.

Homework Statement a motor traveling at a constant speed is just able to completely go round a vertical circular track of radius 8m The total mass of motor is 210kg i)Compute the angular velocity at the top of the track ii)compute the maximum force on the track Homework EquationsThe Attempt...

Homework Statement The expression entering the upper terminal (It is an ideal basic circuit element) is: q = 1/α2 - (t/α +1/α2)e-αt C Find the maximum value of the current entering the terminal if α = 0.03679 s-1 Homework EquationsThe Attempt at a Solution This is an example in my book that I...

Homework Statement Homework Equations dsinθ=nλ IαA2 The Attempt at a Solution I chose D because I thought that D gives the max intensity since the amplitudes superimpose over a smaller area. But the answer is C. I can't see why.

$A=\begin{Bmatrix} {1,2,3,4,5,------,2015} \end{Bmatrix}$ if we pick $n$ numbers from $A$, we call it the set $B$ ,and the sum of any three numbers from $B$ are multiple of 27 ,find $max(n)$ , and the largest number we can choose from $A$

Homework Statement Faraday's disk with radius of axle r1 and radius of disc r2 is shown in the picture below. Disc rotates in the homogenous magnetic field whose vector B is vertical to the disc. If disc is spinning 1000 rpm find induced voltage between r1 and r2 and what is maximal value of...

Homework Statement Hi I'm suppose to find the critical point and minimun or maximum of f(x)=(4/5) Homework Equations [/B] I have a question regarding how to interprete the results The Attempt at a Solution1) we start by finding f'(x)=4/(5*x^1/5) Now my first question is this: we cannot...

Homework Statement A shell is shot with an initial velocity http://edugen.wileyplus.com/edugen/shared/assignment/test/session.quest2529559entrance1_N10030.mml?size=14&ver=1436312588112 of 17 m/s, at an angle of θ0 = 63° with the horizontal. At the top of the trajectory, the shell explodes into...

Prove that the maximum speed (Vmax) of a mass on a spring is given by 2πfA. I have no idea how to solve this problem. I have not taken calculus yet, and I am really confused on how to come up with a solution for this. Any help would be appreciated. Thanks

< Mentor Note -- thread moved to HH from the technical chemistry forum, so no HH Template is shown >[/color] I need someone to check my answers and help me with the questions I couldn't answer. What is the max. # of electrons located in the groud state of a) an orbital 2 b) d sublevel 10 c)...

if $n\in N$ , $9<n<100$, and $f(n)=$ all digits sum of $n$ (1)find $max(\dfrac {n}{f(n)})$ and $min(\dfrac {n}{f(n)})$ now if: if $n\in N$ , $999<n<10000$, and $f(n)=$ all digits sum of $n$ (2)find $max(\dfrac {n}{f(n)})$ and $min(\dfrac {n}{f(n)})$

I have an engine with the following specifications: 305 cc, 4-stroke single-cylinder. Torque : 18.53 N m @ 2800 rpm. Weight of the car 275kg Coefficient of drag:1.15 Frontal area: 0.9177m^2 Rolling resistance:0.04482 Engine wheel efficiency: 78% How can i calculate the Max. acceleration and...

What determines the maximum potential to which the dome of a Van de Graaff generator can be raised? on one hand i have the equation V=1/4πε q/r then there V∝1/r whereas on the other hand the natural tendency for positive charge is to move higher to lower potential. Thus, provided we are somehow...

Hello, 1. Homework Statement A spherical continuous ball is sliding with a constant velocity v along a frictionless lane. Thereafter it enters an inclined surface (the angle between the surface and the horizontal plane is α) with the coefficient of friction µ between the ball and the surface...

Greetings all, this is my first post. I'm attempting to solve a problem regarding different octane fuels for a combustion engine and how pressure from a turbo can influence the Auto Ignition Point (Temperature where a fuel can ignite before reaching its proper cylinder position). The items of...

It is very very good. 9+/10 IMHO See it in 3d if at all possible.

Hey! I'm an EPFL student in 1st year, and we are creating an amphibious vehicle which has to work with the strenght of a spring, so we decided to give him the form of a Catamaran. The thing is that it cannot overpass 1kg, so we prefer not to use aluminium. For the hulls we decided to use High...

Homework Statement A ball (m=0.7kg) is dropped from a height (h=30m). The air resistance force is given by the formula F=kv^2 where k=0.0228 and v is the ball's speed. The ball bounces after a perfectly elastic collision. Calculate the maximum height the ball reaches after the collision...

Homework Statement It was given in my book that:[/B] Systems are capable of doing pressure-volume (mechanical work) as well as non-mechanical work(like electric work). So,(ΔG)P,T=ΔH-TΔS=ΔU+PΔV-TΔS And ΔU=qrev-wmech-welec =qrev-PΔV-welec (ΔG)P,T=qrev-PΔV-welec+PΔV-TΔS =-welec Now in the book...

Homework Statement Hey. I was doing some exam practice questions, but I hit a snag with this one and can't quite work out how to proceed. A 6kg block at rest is pulled along a horizontal surface by force F→ at angle θ. Given that the coefficient of kinetic friction is 0.15, find the optimal...

Homework Statement Find the local maximum and minimum values and saddle points of the function f(x,y) = x^2 + xy + y^2 + y Homework Equations Local max/min critical points saddle The Attempt at a Solution 1) partial derivative: fx = 2x+y fy = x+2y+1 from here, I'm a little confuse on...

Homework Statement :There is a wedge of mass kept on smooth surface. M and block of mass m is sliding in the depression of the wedge.And there is wall in left of the wedge.At which instant velocity of the wedge will be maximum?(surface of contact between wedge and block is smooth) [/B]...

I want to take the arg max over a number of functions as below, however it is possible that there are multiple i's for which the result is maximal. How do i denote that I want to take the last possible i, for example if it results in 3 and 5 I want it to return 5, is there notation available for...

Hey guys, Just want to make sure I'm doing everything right here with some simple calcs. My physics days are long gone and it's been a while since I looked at any of this stuff. A 10,000lb piece of equipment is placed on a flat surface. 2,000lbs horizontal pounds-force is required to move it...

Hello! (Wave) When is the expectancy of $max \{n-q,q-1\}$ , where $n$ is a fixed number and $q$ is in $[0,n]$ , so $\max\{n-q,q-1 \}$ is in $[\frac{n}{2},n]$, equal to $\frac{\frac{n}{2}+n}{2}=\frac{3n}{4}$? (Thinking)

Say I connect a wire to a power supply with a voltage V. The wire is a cilinder with a total surface area A, and resistance R. The wire will get hotter and hotter, and the temperature will increase linearly, according to the equation R(T)=R(1+aT). It will give this heat off in the environment to...

Homework Statement (hebrew) : f(x) a continuous function. proof the following Homework Equations I guess rules of limits and integrals The Attempt at a Solution I've tried several approaches: taking ln() of both sides and using L'Hospitale Rule. Thought about using integral reduction...

I wasn't sure if this was an engineering question or a physics question, but decided to pose it here in the general engineering section. A friend of mine, Blake, has a high-end air rifle that exhibits some puzzling behavior. The highest velocity for the pellet doesn't occur when the internal...

Homework Statement I have to work out the reactions at A & D. Sketch the shear force diagram for the beam and sketch the bending moment diagram. i have worked out the reactions at A=56kN and D=34kN. I have done the SFD. I am just struggling doing the bending moment diagram and don't know how...

Homework Statement In a concrete mixer, cement, gravel, and water are mixed by tumbling action in a slowly rotating drum. If the drum spins too fast the ingredients stick to the drum wall instead of mixing. Assume that the drum of a mixer has radius ##R = 0.5 m## and that it is mounted with...

Homework Statement I've used all the proper equations and done all the work with no problem. My only question is when computing the maximum stress, how do I know which one is the tensile and which on is the compressive? I've attached all my work and came out with Max stress = 3.84 Mpa and Max...

Homework Statement A concrete highway curve of radius 70 m is banked at a 15° angle. What is the maximum speed with which a 1500 kg rubber tired car can take this curve without sliding? The static friction coefficient is 1. Homework Equations Centripetal Force = ## (m v^2) / r ## Maximum...

Homework Statement A roller-coaster car speeds down a hill pas point A and then rolls up a hill past point B. A. Car speed = 20 m/s at point A. If the track exerts a normal force on the car of 2.06x10^4N at this point, what is the mass of the car? (account for gravitational force) B. What is...

Hi, I'm working on the decision version of the Knapsack optimization problem that asks whether there is a subset of the items with a total value of at least V and where the total weight of the items is at most W. I'm looking for an equivalent problem P for this version of the knapsack...

1. Problem Statement: Consider the scattering of an alpha particle from the positively charged part of the Thomson plum-pudding model. Let the kinetic energy of the α particle be K (nonrelativistic) and let the atomic radius be R. (a) Assuming that the maximum transverse Coulomb force acts on...

What do you guys think of Max Planck Institute for Physics as a place for one to pursue PhD in theoretical physics? ny previous experience you can share?

Homework Statement A python can detect thermal radiation with intensity greater than .60 W/m2. A typical human body has a surface area of 1.8 m2, a surface temperature of 30°C, and an emissivity e=0.97 at infrared wavelengths. What is the maximum distance from which a python can detect your...

Homework Statement Hi Everyone, I am going to be doing an experiment soon using strain gauges on a beam and I will have to, among other things, calculate the direction of the maximum shear strain with respect to the axis of the beam. I am trying to find the correct equation to use. Homework...

This is not a homework problem, this is a question borne out of self-interest. I picked up the book "The Dreams that Stuff is Made of" by Stephen Hawking: (https://www.amazon.com/dp/0762434341/?tag=pfamazon01-20 ) and read the first article by Max Planck: "On the Distribution of Energy in the...

Homework Statement Temperature varies by function T(x,y,z)=3x + 4y + 2z Path is given by r(t)={ x(t)=\frac{t^3}{30}+\frac{16t}{9}+7 y(t)=-\frac{t^3}{120}-\frac{13t^2}{30}+28 z(t)=\frac{13t^2}{60}+\frac{4t}{3}-14 t\in \left[0,10\right] Question: What is the maximum and minumun temperatures of...

Homework Statement Hi, I am doing some things with Mohr's circle. I am trying to find the direction of max strain but I am a bit confused. How can I do this? Homework EquationsThe Attempt at a Solution I always assumed that the max strain occurs at 90O from the normal axis or 45O in real...

a) Find the roots of the equation $$x^{2}+5x-6$$ b) Sketch the graph of the function $$x^{2}+5x-6$$ labeling the points at which the graph crosses the axes and the co-ordinates of the maximum and minimum of the curve c) Find the equation of the tangent at the point where $$x=2$$ on the curve...

Hello everybody, I am trying to calculate the maximum velocity(x) an object reaches between two point. The object accelerates from point A to a certain velocity(x) and then decelerates to point B. The acceleration and deceleration are known but are different. The distance from point A to point...

Homework Statement Two equal bodies with temperatures T1 and T2. T1 > T2. The specific heat c does not depend on temperature. What is the maximal work which can be done from this system? I have to get equation for max work which includes c and temperatures. Homework Equations This seems to...

Hi everyone, I am using IRF530 in a half h bridge DC motor driver. The MOSFET is behaving erratically if the PWM frequency is increased above 20 KHz. I checked the datasheet thoroughly but could not find any thing related to maximum operating frequency. Is input capacitance related in any way...

Is it true than general relativity can be deduced from a maximum mass density for matter?

Hey guys; I'm looking for info on the maximum power transfer using the magnetic induction method. The current through a coil, then catch the mag field with another coil idea. Mainly looking for high energy transfer methods, maybe some equations that describe it. A friend and i are playing...

Homework Statement Does the following array represents the binary max heap 99,98,97,55,49,49,48,13,54 99,98,97,55,54,49,49,48,13 Homework EquationsThe Attempt at a Solution I've tried to construct the tree structure and all the above array representation satisfies the binary max heap property...

Homework Statement [/B]A 5228 kg flatbed truck has a 226 kg crate resting on the level bed. If the static coefficient of friction is 0.27, what is the maximum acceleration the truck can achieve without the crate slipping off?Homework Equations [/B]f=maThe Attempt at a Solution i believe i need...

Is it possible to calculate the max flow rate (gals/m) achievable through a given piping system with only the following variables? - 4" SDR 11 HDPE pipe (3.633" ID) - 28,000 feet of pipe from source to destination - 90' of elevation change from source to destination - destination is another...