What is increase: Definition and 865 Discussions

In Demography, the rate of natural increase (RNI), also known as natural population change, is defined as the birth rate minus the death rate of a particular population, over a particular time period. It is typically expressed either as a number per 1,000 individuals in the population or as a percentage. RNI can be either positive or negative. It contrasts to total population change by ignoring net migration.
This RNI gives demographers an insight into how a region's population is evolving, and these analyses can inform government attempts to shape RNI.

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  1. O

    Electric Field Unchanged in Parallel Plate Condenser w/ Varying Distance

    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...
  2. P

    Ball of gas experiences rapid increase in pressure....

    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=...
  3. eryksd

    Simplest way to increase pressure in a container?

    I'm working on an invention which requires that I increase the internal air pressure of a container (while keeping it simple and cost-effective to produce). I know my 3 options are to either: introduce more air into the container, increase the temperature, or decrease the volume. One idea I...
  4. N

    How can an electron's energy levels increase, and decrease as atoms come together?

    How can a electrons energy levels increase, and decrease in eV As atoms come together to form molecules the energy levels of electrons change in eV, but are there other ways a electrons eV can change. Can heating a material change the electrons eV level, when visible light hits the electrons...
  5. MaxKang

    Does the induced drag increase with speed?

    Does the induced drag increase with an increasing air speed for a given angle of attack? Most graphs I found online seem to suggest that the amount of induced drag increases as the speed increases but they actually allow the AOA to vary so I was wondering for a case of fixed AOA(ground roll for...
  6. G

    Is there a way to calculate the entropy change for an irreversible process?

    If we consider a system to undergo an irreversible process from state 1 to state 2 and a reversible process from state 2 to state 2, then through Clausius inequality (1to2∫dQirrev/T) + (2to1∫dQrev/T) ≤ 0 (1to2∫dQirrev/T) + s1 - s2 ≤ 0 s2-s1 ≥ (1to2∫dQirrev/T) Δs ≥ (1to2∫dQirrev/T) Does this...
  7. jfulky

    Finding Increase in Temperature for Two Rods

    Homework Statement A steel rod and an aluminum rod of equal length and diameter are placed end to end and secured so that they cannot flex. The rods are heated to the same final temperature, and the steel is found to increase in length by one-tenth of a percent. If the total length of the rods...
  8. Nemo1

    MHB Surface area of sphere increase at a constant rate

    Hi Community, I have this tutorial question. When I look at the first question (a) I think it is FALSE as the surface area would not increase at the same rate as the radius. For the second question I am not sure if I am interpreting it correctly. If r=\sqrt{\frac{Ct}{4\varPi}+2} where Ct is...
  9. K

    I How can we increase the second moment (moment of inertia) in a physical system?

    Hi there, I am reading a math book with a lot of examples on mechanical physics. I saw a math term about second moment. In wiki, it is said that second moment is just moment of inertia in physics and has definition as below ##\int(x-\mu)^2f(x)dx## here ##\mu## is the average and ##f(x)## is...
  10. Cosmophile

    Intervals of increase: -3arccot(x)

    Homework Statement Find the regions of increase and decrease for ##f(x) = -3 \cot^{-1}(x)## 2. The attempt at a solution My instructor and I disagree. The answer he gave was ##(-\infty, \infty)##, while my answer was ##(-\infty, 0) \cup (0, \infty)##. My reasoning is this: ##-3\cot...
  11. G

    Temperature increase with stirring?

    Let's say that I have a spoon and a cup of coofee, I stir it with the spoon does its temperature decrease or increase ? (There is friction force so a bit of energy should turn into heat but it's strange).
  12. Avijit Palit

    B How to increase brightness of projector

    I have made a smartphone projector. But is has low brightness. How to increase brightness of projector... Help please
  13. Revengeance

    Calculating Tire Pressure Change with Temperature Increase

    An automobile tire has a pressure of 210kPa at 20.0 degrees celsius. What will be the tire pressure after driving for some time if the temperature rises to 35.0 degrees celsius. The equations we have are P1*V1/T1 = P2V2/T2 V1/T1=V2/T2
  14. A

    B A couple of questions on mass increase

    I found these [experimental data](https://en.wikipedia.org/wiki/Tests_of_relativistic_energy_and_momentum#Bertozzi_experiment) on mass increase. > Data of the Bertozzi experiment show close agreement with special > relativity. Kinetic energy of five electron runs: 0.5, 1, 1.5, 4.5, 15 > MeV (or...
  15. Drakkith

    Increase in Charge on a Parallel Plate Capacitor

    Homework Statement The charge on the 3.00 cm2 area plates of an air-filled parallel plate capacitor is such that the electric field is at the breakdown value. By what factor will the maximum charge on the plates increase when bakelite is inserted between the plates? (The dielectric strength of...
  16. Madi Araly

    Increase in Radius when a Star becomes a Red Giant

    Hi there, I have a question regarding the life cycle of a star. I know that when entering the red giant phase of a star's life, its radius/overall size will increase dramatically, but I was wondering if there's a basic way to determine the factor it will grow by during this process. I've seen...
  17. CrackerMcGinger

    Does Fusion Increase Nucleus Density?

    So, I was wondering this; since fusion takes two atoms and combines them into one nucleus, can that increase the density of the resulting nucleus?
  18. danndann1

    Increase Mass/Energy of Stationary Spacecraft?

    Lets say that somewhere in space there is a spaceship that has 2 identical reactors - one in the front and one in the back. The spaceship is stationary relative to earth. We fire both reactors in such a way that spaceship remain stationary relative to earth. Did its mass increased? Did its...
  19. RTE

    Increase a gas engine's RPM to drive a water pump

    Hello all, This is my first post, but I'm no stranger to skimming the boards. Always can find helpful stuff, but I'm stumped on this one. The situation is we have a Kohler 17 hp electric start gas engine horizontal shaft that max's out at 3600rpm. We are attaching a self-priming water transfer...
  20. Sam19KY

    Increase of Amps form 1 to 2 means what?

    Does that mean that the electrons are moving faster or what ?
  21. O

    Do sound waves increase temperature?

    Do sound waves increase the temperature of the medium they are traveling through?
  22. H

    Increase of Uncertainty over Time

    Looking at the literature it appears that the increase in the variance of the wave function over time is proportional to (1+t^2)1/2. Is that right?
  23. M

    When the electric field of the ionization chamber increase...

    Hello. I have a question about the relation between the number of the pair created in the ionization chamber by the radiation and the energy deposited in the counter. In the text, it is written that "The mean number of pairs created is proportional to the energy deposited in the counter."...
  24. T

    Use of draft tube in Francis turbine to increase output

    Work output(deal) for a hydraulic machine per kg of incoming fluid is V(TANGENTIAL)*SPEED OF BLADE (assuming zero out swirl velocity. Draft tube causes static pressure ont runner outlet to fall below zero. Thus available head is increased by an amount equal to this drop. But power output from...
  25. LarryS

    SR Kinetic Energy Mass Increase for Uncharged Particles?

    The mass of a particle will increase as its velocity increases according to special relativity. This has been confirmed in countless experiments in which particle accelerators accelerate charged particles. What type of experiments have confirmed this for uncharged particles? Thanks in advance.
  26. H

    Will speed increase under these conditions?

    A mass is tied to a rope, that rope is attatched to a pole coming out of the screen. The pole is being moved by a person to cause the mass to rotate in a verticle circle at constant speed. A second pole coming out of the screen is introduced within the radius. The second pole interacts with the...
  27. T

    How do solute particles increase boiling point?

    The question is: Which solution listed below is going to have the highest boiling point? A. 1.5 m NaCl B. 1.5 m AgCl C. 2.0 m C6H12O6 D. 2.0 m CaCl2 E. 1.0 m Al2(SO4)3 I chose D (which was right) because in a solution, the more solute particles there is the higher the boiling point (this is...
  28. J

    Increase Phase Velocity by Losing Power ?

    I just read some words from the book Optical Waveguide Theory by Snyder, Allan W., p226. It says that "However, although it is possible for the phase velocity of a mode to exceed the maximum speed of light in the cladding (of waveguide), c/n_cl, this cannot occur without losing power to...
  29. I

    Mass increase due to received photon

    Does molecular mass increase due to angular momentum (h_bar) received from photon since now we have objects rotating inside the molecule?
  30. A

    Why they don't increase altitude of ISS to overcome drag

    Experts - Why they don't increase altitude of ISS to overcome slight atmospheric drag it faces. Due to this, they need to make altitude corrections frequently to ISS. I want to know, why they can not put ISS in higher orbit where there is almost nil atmospheric drag (or may be altitude...
  31. J

    Does rest mass increase in conformal co-ordinates?

    Title should be: Does rest mass increase in the FRW metric? The flat FRW metric can be written in conformal co-ordinates: $$ds^2=a^2(\eta)(d\eta^2-dx^2-dy^2-dz^2)$$ where ##\eta## is conformal time. Let us assume that ##a(\eta_0)=1## where ##\eta_0## is the present conformal time. Now the...
  32. M

    How can an increase in area cause a decrease in drift speed?

    Homework Statement We have: I=nAve Imagine a copper wire with a constant current through it: I=constant e=constant n (for copper)=constant Hence, we obtain: A is inversely proportional to electron drift velocity. My question is: how does that make sense? Why would the cross sectional area...
  33. ptownbro

    Is it possible to increase the amps within/along a circuit?

    Let's say you have a basic series circuit with a battery power source that has 12 volts. You also have a load of some sort with 3 ohms of resistance. Therefore you'll have 4 amps of current throughout the circuit. Is it possible to add some item within or along the circuit (and before the load)...
  34. toboldlygo

    Does pushing down on a book increase the Normal force?

    So, I know that there is a Normal force exerted on the book by the table, and, according to Newton's Third Law, the book exerts a force onto the table. However, I have two questions: if I were to push down on the book, would that Normal force increase? What "creates" the Normal force? Is it the...
  35. F

    Why did the U.S. homicide rate increase in early 1900s?

    The social sciences used to have their own forums in PF, what happened to them? They used to be a great lace for discussion. Anyways, this still seems the best place to ask this question. According to Wikipedia at least, the homicide rate in the U.S. per 100,000 persons increased from about...
  36. G

    Finding pressure increase required to impart 1J of work

    Homework Statement a) Estimate the pressure increase required to impart 1 J of mechanical work in reversibly compressing 1 mol of silver at room temperature. b) What pressure rise would be required to impart 1 J of work to 1 mol of alumina at room temperature? For AL2O3 take the molar volume to...
  37. A

    Reduce mass flow rate may increase air velocity?

    Hi, I used a blower to flow air across an open duct through a nozzle. By using a gate valve, the mass flow rates were controlled. I took measurement in 3 different locations along the ducts. But, why by decreasing the mass flow rate, the air velocity was increased? It is just happened for the...
  38. I

    Engine torque: Can an alternator increase ICE torque?

    Hi there. What would happen if, while generating electricity with a fixed inlet power from the ICE, the alternator suddenly increase the out put demand by increasing the voltage? Does the engine would augment the torque while reducing RPMs? consider a self excited alternator, the voltage is...
  39. Villa

    Why pressure decreases with increase in velocity

    We know that pressure= force/area... If the area of the pipe is reduced then the pressure must increase... But according to Bernoulli's, the pressure will decrease ... How is it?
  40. caters

    How much does the radius at the surface of the water increase per inch?

    Homework Statement A truncated cone has smaller radius of 5 feet, larger radius of 10 feet, and a depth of 1 foot. Total volume is approximately 183 cubic feet. If I have water in there at x inches how much does the radius at the surface of the water increase per inch? Homework Equations f(x)...
  41. S

    Does n type doping decrease or increase the bandgap?

    Hi, I understand that a n type doping will increase the number of electrons, and those electrons will go to the conduction band since the valence band is already filled. I don't exactly understand the effect on the bandgap. Thanks!
  42. D

    Temperature increase in a fixed volume when adding mass

    Hello, I'm interested to know if that in a fixed insulated volume (e.g. 500ml), at some temperature (e.g. 293K) and pressure (e.g. 1 atmosphere), and you increase the pressure by a specific amount by pumping more gas (e.g. air at 293K) into the volume can you work out the expected increase in...
  43. S

    How does the universe so conspire that entropy increase?

    How does the universe so conspire such that ΔS≥0, entropy increases?
  44. B

    Reducing and increase of order and ODE

    Two questions: First: If is possible to reduce the order of an ODE increasing the number of equations, so, is possible do the inverse patch? In other words, is possible reduce the number of equations of a system of ODE increasing the order? Second: This technique of reducing and increasing of...
  45. I

    Various ways of doing work to minimize entropy increase

    [Moderator's note: Recategorized thread to "Basic".] While driving alone through the beautiful scenery of Banff and Yoho national parks, a question formed in my mind. Which of these modes of slowing down a vehicle by an equal amount is likely to minimize the resulting overall increase in...
  46. D

    Temperature increase with pressure in an open vessel?

    Hello all, new here please excuse if this is in the wrong area of the forum. My question is does temperature increase in a linear fashion when pressure is added? What formula can be used to accurately monitor temperature increase as pressure is added? Imagine having a set temperature, let's...
  47. S

    Temperature increase by light absorption

    Hi, I have a question. If a crystal absorbs light and the absorption process leads to some excess energy being released as heat . Can one calculate the temperature rise or an experiment would most certainly need to be done? Apart from the heat capacity of the crystal before light absorption...
  48. F

    Magnetic field to increase concentration

    can I apply magnetic field to increase concentration of a gas? or I will need too big magnetic field to surpass the 1000C molecular motion?
  49. K

    Time Dilation & Mass: Does 2x Mass Mean 2x Slower Time?

    I was wondering if time on a planet which is exactly twice the mass of the Earth would pass exactly twice as slow relative to Earth time? So after a year on this big earth, two years would have passed on earth? Thanks
  50. F

    Increase temperature of liquid in a box without heat convection or conduction

    hello I have a liquid or gas inside a metallic box (eg. stainless steel 5mm thick) how can I increase its temperature without heat convection or conduction?
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