increase Definition and 843 Threads

Why is it so much easier to increase the temperature of something than it is to decrease the temperature? Why are refrigerators more complex than stoves?

I was reading the Feynman lectures and in one of the chapters on thermodynamics it is stated that stretching a rubber band makes its temperature rise. I feel like I understand the thermodynamics of the rubber band and yet this statement is puzzling me. I believe that when you stretch a rubber...

I'm having a hard time understanding some fundamental properties of our expanding universe. It seems reasonable that globally the size of the universe increases bc of the expansion. However the size of each causal patch/observable universe stays the same. Following this logic it would seem that...

If you have an non-viscous incompressible fluid flowing in a pipe whose static pressure is higher than atmospheric pressure, then after exits the pipe will the dynamic pressure increase? The static pressure of the fluid right after exiting should decrease because it should be equal to the...

Hello, I was wondering if there is any way of increasing a transistor or thyristor maximum voltage ratting in DC? Thanks. Edit: Just to be more precise, I am referring to the off state. I know you can the on state via a resistor.

Homework Statement Is following statement True or False? For inelastic collusions, the total KE of colliding objects just after collision is less than the total KE just before collision. The answer is given as False with a mention saying: "This is normally true but in some cases it could...

Hello~all,thanks for taking time to read my thread. I'm in hot water now,Can anybody here help me out? Please look at the following picture,I would like to rise the voltage from 24V to 36V. And I did it according to the datasheet of CS5173. However,the chip always burned out ! I can’t understand...

Thanks in advance!

A problem I encounter when microwaving food is that the centre is no penetrated by the microwaves so remains cool and I have to wait for the heat to be conducted through which takes a long time and undermines one of the advantages of microwaving which is the speed of the process. Would it make...

Hello If I travel toward a strobe light, will the flash rate appear to increase? If it does, would that then mean that the light entering your eyes was entering faster than the speed of light? If the strobe flash rate does not increase then this universe is stranger than I thought. I have been...

Question: If you charge a capacitor circuit and then separate the capacitor, does voltage increase beyond the initial source? It seams counter intuitive that if you plug a 9 Volt battery into two metal plates and pull the plates apart that you'll get massive voltage spikes, but that's what the...

Is there any entropic gain when the surface of a liquid is minimised? Per example, molecules "enjoy" maximum entropy when they are at the interior. Is this valid?

So I'm doing some research for a physics essay on particle accelerators and I don't want to go into too much mathematical detail (as I haven't studied statistics or higher level Physics at school yet), but I have googled a lot of things and nothing seems to come up for methods scientists are...

Hello, I am trying to figure out how much the human skin temperature would increase when the skin is illuminated by radiation of a certain intensity (W/m^2). We can assume that the skin has an emissivity and absorptivity both equal to 1. For instance, imagine the skin illuminated by the sun (I=...

This is a general question, not a homework question, and @berkeman said I should post it in the EE forum... I'm trying to get a better understanding of the relationship of dielectric constant (relative permitivity) to dielectric strength (breakdown voltage).I want to know what happens when you...

In my labs we use hot plates with a 0-10 temperature knob. The hot plates don't have a temperature monitor, so i have no idea how hot each number can increase it or how hot it is at the time. Sometimes i have labs where i have to heat something to more specific temperatures or else the reaction...

is incresing the entropy of low entropy system easier than trying to increase the entropy of a high entropy system? or is it vice versa? let's say it requires x amount of energy to increase a low entropy system, now will increasing an already high entropy system require 2x amount of energy or...

I was reading an online chemistry textbook that said "when a liquid is subjected to hydrostatic pressure (for example, by an inert, non-dissolving gas that occupies the vapor space above the liquid surface), the vapor pressure of the liquid is slightly raised." (link...

First let me see if I understand what mass is ...it's the measure of an objects ability to attract other masses , and also resist acceleration ... the two always come together and define the term "mass" ... there are no subdivisions in the term 'mass' ... no different kinds of mass . I was...

Why does salt water increase rate of corrosion, really? Most common answer I read was that salt makes water a better electrolyte. No further explanation. However, I'm not really getting the mechanism of this. I understand the mechanism of pitting corrosion in presence of chloride ions and I...

Let's imagine a deterministic universe. A one where quantum mechanics simply doesn't apply. Ok. This was the universe of classical physics. Atoms exist, and they behave deterministically. Fine. Now, how can entropy increase in this universe, altough it has the same laws of physics. In a...

For a string in string theory, Energy = string tension * length So I'm wondering if it can increase its length with increasing its energy.

follow up from responses in old thread. https://www.physicsforums.com/threads/why-does-attenuation-coefficient-decrease-with-increased-energy.569981/ I have seen in my experiment using a saline media ( some oxygen bubbles) that an increase in Incident PFD is showing an slight increase in the...

The formula usually givento find the relativistic energy of a particle is :## E^2 = p^2c^2 + m^2c^4 ## which is derived from the original Lorentz formula for mass: ##m=\frac{m_0}{\sqrt{1-\frac{v^2}{c^2}}} ## which gives the value of the total mass including the rest mass and, subtracting the...

If you have a cooker with a volume of 3000 cm^3, then you add 200 ml of water, and let it turn into vapor at 100 C over time, how would you calculate the pressure at any point during the evaporation? It's not homework, just an example so you get what I am saying.

My design concept stems from the fact that the pressure in a tube increases exponentially based on the length of the tube compressed. I would like to design a tube that increases pressure at a more constant rate. I would imagine that a tube curved inward toward the base would achieve this. As...

It appears very non intuitive to me seeing TS diagram of vapour compression system; Area under the curve increases. But how seriously how higher evaporator temperature will lead to higher refrigeration effect. Refrigeration effect means lower temperature.

Stretching a rubber band increase its mass due to e=mcc, but how?

Why is there less pressure if the velocity of the fluid is increased?

Homework Statement It's a Blackbody radiation problem: A beam of wavelength λ, in the state of right circular polarization, leads to an absorbent disk.The mass of the disk is m, it's specific heat is C, and its moment of inertia is I .The disk is initially at rest, but after a lapse of time...

I was just thinking while watching the Zookeeper movie. If a child is born and we teach it how to move on it's legs and knuckles instead of just it's legs would it end up being a great deal stronger than people it's age? I think the most weight ever lifted by man was 450 KG, and an average...

Some said alpha particles are released in high speed so that it has a high ionizing power. But some said alpha particles (~10% light speed) have higher ionizing power than beta particles (~30% light speed) because it is slower, so it gives more time for it to ionizing surrounded air particles...

For a project I am doing I need to increase out put speed to 515 rpm from 1rpm with no more than a 20% decrease in torque, I need help I have been trying a lot of things and can't figure it out.

Good Evening/Morning/Afternoon Everyone, Question: Why is it that demonstrations of Van de Graff generators use Leyden Jars in series to get bigger sparks? If a spark gap's size determined by voltage, and Leyden jars are simply to be treated as capacitors which wouldn't increase voltage, why...

Hi everyone, I'm sorry if it sounds dumb but I'm struggling here trying to understand how to increase the pressure in a pipe using an air compressor. I wasn't able to find information for this really basic engineering problem, so hope you guys could help me. Basically, the idea here is to...

This question is regarding the dependence of Planck's law for black-body (BB) radiation intensity (or integrating over a hemisphere, the emissive power, E = pi * I). Physically speaking, why is it that a BB emitting in a medium with n>1 (n being index of refraction) emits a higher power/area...

Homework Statement A 12 V, 24 W lamp and a resistor of fixed value are connected in some way inside a box with two external terminals. In order to discover the circuit arrangement inside the box a student connects a variable DC power source and an ammeter in series with the box and obtains the...

Homework Statement An electrical heating element is to be designed so that the power dissipated will be 750 W when connected to the 240 V mains supply. (a) Calculate the resistance of the wire needed. (b) The element is to be made from nichrome ribbon 1.0 mm wide and 0.050 mm thick. The...

So say that I have the quadratic equation ##x^2 - 2x +1 = 0##. If I multiply each side by ##x##, a valid operation, I get the new equation ##x^3 - 2x^2 + x = 0##, which has a different solution set as the first, namely ##\left\{ {0, 1}\right\}##. If I make the substitution ##x^2 = 2x -1 = 0##...

Not sure if this is Chemistry or not, but how would one increase oxidation in an object?

First, what are these 'particles' that appear with their negative mass counterpart and suddenly disappear very quickly and why do they do that? Now, I know the positive mass ones are allowed to escape the event horizon while the negative mass doesn't, thus fall into the black hole, but how does...

How to increase external information processing speed / power of a Computer / CPU? When I say external information, I mean external stimuli. When I say processing speed, I mean the speed at which the CPU / Computer processes external stimuli. So for example, one Computer might take 10 seconds...

Hello, I Have built a 50w solar panel that gives an output of ~ 9.2v @ 5-6 amps during a good day. This is not enough to charge a 12v battery. To get around this, I am trying to use a DC-DC boost converter (specifications are below) and it is set to give an output voltage of 13.5v. The only...

So say we had 2 batteries, B1 and B2, and B2 is on top of B1. The + terminal of B1 connects to - terminal of B2, and the + terminal of B2 connects to - terminal of B1. Why does this double the voltage compared to the voltage of just B1?

Homework Statement Why doesn't the temperature of a moving jar of gas increase? Homework Equations Average KE is proportional to temperature The Attempt at a Solution This is just an extension of a problem my friend sent me, and I'm stuck on why even though average velocity is increasing...

] I found in a textbook that the value does not change because the centripetal force is perpendicular to the tangential velocity. But I am confused, because a vector can have a component, which is perpendicular to the vector. So if the centripetal force is perpendicular to the tangential...

This may be a matter of me being confused by the definition of heat. However, I view heat as the energy passed between systems of different temperatures. My problem is the following: By the principle of minimum energy/max entropy, in an isolated system (and therefore fixed internal energy)...

Every time my IDM (internet download manager) starts, I see only 8 threads running. How can I run 32 threads at the same time ? :biggrin: Thanks IDM super users and developers.

If the distance between the plates of a parallel condensor is 4mm and the potential difference is 60 volts . Now if we increase the distance between the plates to 12mm , then Why the electric field does not get decrease , instead of that potential difference between the condensor becomes 180...

Homework Statement A self-gravitating ball of gas suddenly experiences a rapid increase in its pressure to a new value P'. Taking average density of the star to be ρ and radius R, and ignoring gravity altogether, estimate the time scale of expansion of the star. Homework Equations Force=...