increase Definition and 866 Threads

Hi, I'm wondering why the Sun's luminosity has increased over time. I have learned that every star in the main sequence also tend to increase their luminosity but I haven't figured out why. Luminosity is related to star's radius and temperature so does these parameters rise during the...

1. What is the pressure needed to increase the melting temperature by 20 centigrade degrees? Given: Molar Volume (solid) at normal melting temp is 18.92 cm^3 Given: Molar Volume (liquid) at normal melting temp is 19.47 cm^3 Homework Equations delta H (s>l) = T(melting point)* delta S(s>l)...

If so, wasn't it confirmed when we saw an increase in ice levels at the poles this year?

http://www.tgdaily.com/html_tmp/content-view-39973-113.html Also notice the stubborn misunderstanding: Run http://geosci.uchicago.edu/~archer/cgimodels/radiation.html with the basic inputs to get an output radiation of 287.844 W/m2. Now put zero in the CO2 box to get 318.396 W/m2, then...

There is a spaceship in low-earth orbit, at 2000km above the surface of the earth. There are two balls in the spaceship that are dropped. The balls are 1m apart. How long will it take for their separation to increase to 1.01m? Assume that one ball is at 2000km, and the other is at 2000km+1m...

Homework Statement You run a race with your friend. At first you each have the same kinetic energy, but then you find that she is beating you. When you increase your speed by 21%, you are running at the same speed she is. If your mass is 77 kg, what is her mass? Homework Equations...

Hi All, This isn't really a physics course related question or anything (i barely passed secondary school science). But this seems like a place I might be able to find my answer. I'm trying to find the calculation to work out what the increase in speed is of air flowing over a planes...

Homework Statement The radius of a circle is increasing at a constant rate of 0.2 meter per second. What is the rate of increase in the area of the circle at the instant when the circumference of the circle is 20pi meters? Homework Equations The Attempt at a Solution I have no...

A sealed and thermally insulated container of total volume V is divided into two equal volumes by an impermeable wall. The left half of the container is initially occupied by n moles of an ideal gas at temperature T. Which of the following gives the change in entropy of the system when the...

Hi all, I'm a little stumped with how the dielectric increases capacitance. The general solutions all involve using the formulas, but don't really treat it conceptually. I realize that inserting a dielectric decreases field strength, and hence decreases the voltage across the capacitor. But...

not able to pick up a 1 kg iron object off the ground by overcoming the gravitational force between Earth and the object. Consider this : It can pick up a 1 gram (iron) object easily. Then, the increase (from 1gm to 1 kg) would be by a 1000 times. Clearly that increase cannot account for the...

Homework Statement The area of the Earth that is covered by water is 361×10^{6} km^{2}, the volume of the water is 1.4×10^{9} km^{3}, and the mass of the water is 1.4×10^{21} kg. The density of liquid water, as a function of temperature, can be approximated by ρ = 1008 − T /2 kg/m^{3}, where T...

I have two questions about infinity: 1. Can infinity increase? In other words if a number can increase, wasn't it less than infinite before the increase? 2. If a number is finite, must it have a limit? The folks over in cosmology can't get through to me on how the universe can...

Has anybody ever tried adding mirrors around a laser tube cavity where a lot of spontaneous emission can be reflected back into the tube? The idea is like this - if there is a low probablitity of absorption, perhaps the emissions will be induced to occur down the main laser tube where the...

Two loops have current flowing through them (see picture). The top loop lies directly above the bottom one. When the current in the bottom loop is increased, what happens to the top loop's current? Does it increase, decrease, go to zero, doesn't change or it depends on the relative values for...

Six days ago, the Dutch government added a flight fee at Schiphol, the Amsterdam airport, to be used to lower Earth’s atmospheric carbon dioxide (CO2) levels. The Netherlands is one of the four countries that tax carbon put into air in response to advice from the UN-sponsored Intergovernmental...

So they decided to give me an electrical problem at work, and I am completely lost. They're worried about 120V from the wall crossing over onto a 22 AWG wire and causing it to heat up. Is there a way to calculate temperature versus time for this situation? The length of the wire will change...

Homework Statement A hot water heater is operated by using solar power. If the solar collector has an area of 6 m^2, and the power per unit area delivered by sunlight is 1000 W/m^2, how long in hours will it take to increase the temperature of 1 m^3 of water from 20C to 60C? (1 cal=4.186 J)...

Homework Statement how much work is done in increasing the charge on a 3 microfarad capacitor from 300 microcoulombs to 600 microcoulombs? i am supposed to get work W = 0.045 joules Homework Equations capacitance C = Q/V where Q is charge in coulombs, V is electric potential in...

Wavefunction collapse ==> increase in entropy?? I just read an article in Scientific American by Sean Carroll, called something like Does Time Run Backward in Other Universes. In it, he says that the reason wavefunctions only collapse and never un-collapse is because collapsing represents an...

Homework Statement A 40mm diameter bar of aluminium is 2.5m long the bar is has its temperature raised from 20°c to 40°c. Determine the increase in length of the bar in mm. Take the Al = 24 × 10-6 °C-1 How much heat has been transferred into the bar if the SCH = 0.9kj/kg °C Homework...

Homework Statement By how much does the mass of the Earth increase each year as a result of sunlight reaching it? Radiation from the sun reaches the EArth at a rate of 1400W/m^2 of area perpendicular to the energy flow. Assume 100% absorption. Homework Equations I'm sorry but I haven't...

Inspired by http://www.news.com.au/story/0,23599,23696646-13762,00.html" . Would running before you spit increase the distance your spit travels? I figure, most of the energy comes from your mouth, and you'd probably stop at the end of your run, so would a "running start" increase the distance?

how can we increase the efficiency of brakes in an ATV specially? I'm working on an ATV these days n plan to use disc brakes... i read about cross-linked braking circuit...can someone tell me how efficient is this system...should i try to employ it?iv heard it has been used in Audi before...can...

If gravity on Earth were to increase overnight by 10% how do I go about calculating the way this would affect my movements, how fast I could walk, run, swim etc and how this would affect my muscles? I'm presuming my body would be working harder so I would find movement more tiring and would be...

Hello, could someone help on this question?? ok, I'm trying to find out how much a piece of wood expands and contracts with changes in humidity and temperature, I'm sticking a strain gauge on the wood to detect the expansion and contraction of it. my question is if the temperature increase...

Hello All, glad to be a part of this elite community, i have been following the forum threads for quite few days now, i am really interested to hear from Mr.Berkeman. here is my problem: we are facing a problem at the rectified output of our power supply, we have used a bridge rectifier to...

If an atom with more protons have tighter electron orbitals than atoms with fewer protons, why doesn't the "atomic radius" decrease up the periodic table? Instead it increases, why is this?

Hi all - this (seeming) paradox has been brought up on a few other forums with less than illuminating results. I'm curious to see what the solution is. Okay, so, you're watching a massive object approach the speed of light. From your reference frame, you are measuring the increase in apparent...

Ok, I need to calculate the increase in temperature of a nail hit by a hammer with force of 500N. The length of the nail is .06m, so the work done and, I'm assuming, the energy added to the nail (Q) is 30 Joules. The specific heat capacity of the nail is 450 J/kg *C(degrees Celsius). By using...

This is the problem: The limit of continuous absorption for Br2 gas occurs at 19750cm^-1. The dissociation energy that occurs is: Br2(gorund) = Br(ground) + Br(excited) The transition of ground bromine atom to an excited one corresponds to a wave number of 3685 cm^-1: Br(ground) =...

I'm relatively new to physics. I know that dropping 2 objects, at the distance from the ground, they will land at the same time. But what would happen if you dropped objectA at 2 meters height, and held objectB at one meter height, and only let go of objectB, when ObjectA has already...

In testing the loss through a fiberglass panel I experienced instances where the received power level increased. I have checked and double checked my setup and changed the distances between the horn and panel, I still am seeing odd results. Has anyone had any experiences such as this. I am...

What I've learned is that when going at a fraction of C, the energy put into the acceleration is transferred into mass. However what is strange is that its gravitational strength does not increase. People keep saying that gravity is a property of the invarient mass and that alone. So then...

hi, I am 21 years old 180cm tall and 73kg, I'm an ex smoker. I'm in the process of an army application but need to improve my peak flow. will increasing my vo2 max help and are there any other ways to increase peak flow.

an experiment^^ in a closed container, means tat it has a constant volume. when i increase the air pressure inside(without heating), the result is the temperature will increase. why? can i hav a theoretical explanation? thx for reading

Homework Statement A freight train has a mass of 1.2e+7 kg. If the locomotive can exert a constant pull of 8.4e+5 N, how long does it take to increase the speed of the train from rest to 82 km/h? Homework Equations (mass*velocity)/time=force The Attempt at a Solution (1.2e+7 *...

A warning is often given that if one wants to have a spaceship traveling at relativistic speeds (usually to get to another star), the ship's mass increases, making acceleration more difficult. But if it where an antimatter propelled ship, with mass being turned into energy, then wouldn't the...

Does knocking out SCH9 and SIR2 in mice increase their lifespans by 6 times? Longo said age-dependent mutations increase at a remarkably low pace in organisms lacking both SCH( and SIR2 but does that apply to mice as well as yeast?

OK, i have a final coming up, and i need a little help... i need to know how and why an object moving faster acquires more mass... it doesn't make sense... mass is how much matter somethign has as far as i know, but when you speed up, you acquire more mass? this goes hand in hand with the length...

Alright, i have a final and i have to explain just three parts to einstein's theory of relativity... they are space travel (time slowing nearing the speed of light), increase of mass with speed, and length contraction... the space travel makes no sense, and the mass one, i have mixed feelings...

Situation: Start pressure: p1=1 bar; Volume: V=36m3; Temp.: T1=T. Now I need to increase the pressure to 6 bar, but the volume remains unchanged. So: End pressure: p2=6 bar; Volume: V=36m3; Temp.: T2=T. So volume and temperature remain unchanged. What amount of gas (m3) do I need...

How can we increase our interpersonal skills?

I understand that physics is mostly based on empirical evidence, but sometimes it's interesting to know how some things are explained. My questions about friction are: 1. Why does friction increase as velocity increases? 2. Why does it take time for friction to become equal to the...

Suppose we have box with a volume V which is divided down its middle. So the box is split in two sides with equal volume (V_1 = V_2) and gas molecules (n_1 = n_2). Now, we remove the partition and the gas from both sides mix. Is there an entropy increase in the system? The whole process is...

Homework Statement You're in an airplan whose two engines are running at 560rpm and 570 rpm. How often do you hear the sound intesity increase as a result of wave interference? Well, i know that the intensity will increase when the wave interference is constructive, but point me in the...

I know this is a simple problem, but I don't know where to begin. Please help! A small immersion heater is rated at 350W. Estimate how long it will take to heat a cup of soup (assume this is 250 mL of water) from 15 degrees celsius to seventy-five degrees celsius

I'm trying to design a synchronous logic that uses a negative edge flop to shift data out of a chip (as part of the IEEE1149.1 standard). The input to this negedge flop is muxed from a whole bunch of shift registers within the chip, and these registers are all on posedges. Ideally, if...

hey guys imm new here i got a question in my book i can't figure out it says: an athlete executing a long jump leaves the ground at a 30 degree angle and travels 7.80m (a) what was the takeoff speed? (b) if this speed were increased just 5.0 % how much longer would the jump be? anyone...

an increase of $0,15 on a price of 2,50 is an increse by a fraction of 0.15/2.50=0,06 expressed as a percentage,therefore a 6% increase I don,t understand this and why we put 0.15 is numerator