increase Definition and 843 Threads

A resistance 'R' ohm and inductance of 'L' henry are connected across 240V, 50Hz supply. Power distributed in the circuit is 300W, and the voltage across R is 100V. In order to improve the power factor to unity, the capacitor to be connected in series should have a value of __. a) 43.7 uF b)...

I'm hoping this is a good place to start with this question. I'm the incoming president of my university's ASME branch and I want to find unique ways to increase interest. Maybe I'm being to idealistic, but I feel like the organization has seen quite a drop off in interest in the last few years...

Hey, In x-ray tubes, how come an increase in the voltage results in an increase in the intensity of the electrons. i.e. the no. of electrons emitted per unit time per unit second. Thanks.

Homework Statement A pump motor is used to pump water at a certain rate from a given pipe. to increase the rate of pumping of water 2 times from same pipe by how much times power of motor must be increased? Homework Equations The Attempt at a Solution

I read in Dr. Ivy's book* that testosterone blocks the effects of cortisol and causes cortisol levels to rise in response to this cortisol resistance but has a net pro-anabolic effect (I guess in part because it blocks cortisol's catabolic effects and the body will not totally normalize the...

There are rumors circulating recently on various forums on the internet that a net made of coiled up silver wires increases the efficiency of a gas range when placed on top of the gas burner while fuel is being burned. According to what manufacturers claim, this is done by using the reaction of...

I thought heat increased reaction rates, meaning that when something is at equilibrium, it should increase both the forward and reverse reaction rates... Is this wrong? Then why does Le Chatelier's principle predict that a temperature increase favors the endothermic direction?

Hi, I have a fundamental question Density is mass divided by volume. As you heat something up the volume increases so the density decreases. Ok, but can anyone explain with a physical(intuitive) example: that is why is it that when you heat up something volume increases??Any intuitive...

consider two wires of different diameter. when current enters from that of greater diameter to lesser diameter drift velocity increases. which force causes it to increase?

Homework Statement what is the increase in kinetic energy of the particle after being accelerated by a potential V/2? The Attempt at a Solution The textbook says it is q*V/2 but I just wondered why this is the case

Wow, a single 50% bump for the same service! If they plan to shift to a purely online format and to phase out the DVD rentals, I can live with the transition. But if they play games with online availability to force DVD rentals, I may be forced to start Redboxing it. I don't care about the money...

I have been thing about this, seems logical in a way, most reactions increase with concentration surface area, temperature and catalysts. Some of the factors are listed here:- http://library.thinkquest.org/12497/factors.htm They seem pretty similar to the one I put in the answers to my...

I thought capacitance was a function of geometry. So how come when we put in a dielectric in between a parallel plate capacitor it increases the capacitance. Is this because we can increase the E field in between without worrying about dielectric breakdown. Or does it have something to do with...

why doesn't capacitance decrease with increase in temperature?? It is known that conductivity increases with temperature.This is because heat provides kinetic energy to the electrons in a substance,thus increasing the rate of "flow" of electrons.Considering this,the electrons in a dielectric in...

I tutor at the science department's drop-in tutoring center at my university, and my supervisor seems worried about how students are learning things today. She says that she has noticed an increase in the number of students that don't really learn any material. They simply cram everything into...

Homework Statement You have a co-axial cylindrical capacitor placed in vacuum. The two co-axial cylinder tubes are made of copper. The outside tube radius a1 and inside tube radius a2, with overlapping length L; both tubes have a thickness of t. Say, the capacitor was designed to withstand 5...

I understand that the electrostatic field around a charged particle contributes to its mass. It is as though there is a cloud of mass/energy centred on the charged particle that travels with it contributing to its inertia. I have found that the mass/energy of this cloud can be enhanced by...

Hey guys and girls The first thing I should probably ask is why do fuels (Hydrocarbons) spontaneously ignite when they are compressed, this seems rather strange to my brain in fact it makes my brain feel like it's having a meltdown (if you have ever had that feeling). The whole idea confuses...

I'm a bit confused. Relativity states that we should observe a shortening of say a spaceship when it moves close to (c) correct? But isn't one of the reasons we can't accelerate mass to (c) because rather than reaching any higher speeds when getting close to (c) it would just increase in...

I understand that GR predicts that as an object's speed increases, so does it's mass. I wanted to know if there have been any observations that confirm this, by calculating the gravitational attraction of an object at varying speeds.

Can heat supplied to a body increase its entropy without even changing its temperature? I recall that increase in randomness is accompanied by a change in temperature.

Hi all Hope some one can help with this Calculate the increase in kinetic energy due to acceleration? 0.6m diameter Solid cylinder with a mass of 120kg, initial velocity of 20.94 rad/s and final velocity of 146.61 rad/s. I have found an equation for the kinetic energy lost at...

hi,please how much does the blood pressure in your brain increase when you change from a standing position to your head

Hi. I've been studying in details how a microphone works. I've found a type of microphones where capacitor is used to record sound. The idea is simple. Increasing and decreasing the distance between the plates of a capacitor (sound waves) results in the changing capacitance. Being connected...

What is the easiest, cheapest what to increase the range of this RF transmitter? Right now it outputs 8mW which gives it about a 500 foot range. I need it to be increased to about 40 miles line-of-sight. http://www.sparkfun.com/products/8946

Let's say you're mass is 100kg and you're traveling at 0.9C. The relativistic effect on your mass is roughly 2.3 so you now have a mass of 230kg. If you went whipping past me, would you appear to have a mass of 230kg or 100kg? Seems like a no-brainer. But it keeps tripping me up! TIA...

I'm doing a project for physics involving crashing cars into walls and recording the forces generated... I've heard that a seat belt actually causes most deaths in the instance of a crash... is this true? Thanks, "Practice is necessary to improve an athlete’s performance without it, the...

If you were to focus an extremely large area of light of a given frequency into a small area of empty space say from 300,000,000m X 300,000,000m into 1m^2...would you get an increase in frequency? I understand that the waves may collide and possibly summate... If the frequency of the light...

Homework Statement We have a lab in which there is a ramp with one end on the floor and the other end is on top of a few textbooks. Therefore, it has a slope, and an object is lifted using the ramp. What can we do to this set-up to increase the efficiency, OTHER THAN INCREASING THE HEIGHT...

Hi guys, I am trying to implement Analogue FDM on top of my single carrier modulation (eg: QAM and QPSK) of Multi carrier modulation (eg: OFDM). For an example, I have two different pair of I and Q channels, where first pair is upconverted at 2.2 GHz and the next pair at say 2.7 GHz and them MUX...

Please help me and calculate the amount of torque required to sustain a car ,3500 lb car medium wind drag. aproxamently 70 mph. I know without wind resistance you can not figure exact but a close estimate would be greatly appreciated. Im wanting to add a secondary mini diesel engine 662 cc...

Homework Statement 7. Mass m is oscillating on the end of a spring. How much mass must be added in order for the period of oscillation to increase by a factor of two? A.m B.2m C.3m D.4m E.8m Homework Equations f=-kx w= \sqrt{k/m} T = 2\pi\sqrt{m/k} The Attempt at a Solution...

I'm just curious, when light enters a black hole, does the black hole gain a little bit of mass? We think of photons as massless particles, but they do have energy, and energy has a mass equivalent, e=mc2 Would the mass gained perhaps be, = hν / c2 ?

Homework Statement On a day when the air temperature is 19 °C, a 0.15 kg baseball is dropped from the top of a 24 m tower. After the ball hits the ground, bounces a few times, and comes to rest, by how much has the entropy of the universe increased? Homework Equations ΔS = Q/T Also gravity...

Homework Statement After a rise in price of petrol, the driven mileage dropped by 6.7% , however the fuel costs increased by 4.5%. Homework Equations By what percentage did the petrol price rise ? The Attempt at a Solution isn't simply 4.5% ?

Hello, As I believe is normal policy, please don't give me the answer to the problem :) I would, however, greatly appreciate a bump in the right direction. Homework Statement Triangle abc: side a=12, side b=15, angle C is increasing at 2 degress/minute. How fast is the length of side...

Homework Statement How much heat energy is needed to heat oxygen, mass=10g which is on temperature t=27°C to make the volume go up by 3 times while pressure is constant, and after that increase the pressure 2 times while volume is constant. Specific heat capacity of oxygen is cp= 908 J/KgK and...

am nt sure if am posting in the right section bcoz this is my 1st post.. please could i get help in understanding how to increase the torque of a dc motor without changing the rpm.. n how are gearboxes designed exactly which increase torque.. i basically want a mechanism 2 deliver higher...

I am working on a project and am combining three laser beams in an effort to make artificial white light out of the end of the fiber. It is currently producing about 1 mw of power. How could I increase the power out of the end of the optical fiber?

Homework Statement We were given an assignment to place corn syrup, dish washing detergent, shampoo, water and olive oil in a beaker, along with 6 non-metal objects, to show how they would separate based on their relative densities. The last problem on the paper states: "Write a hypothesis for...

hi friends i am working on project that is to generate electricity by using turbine which is integrated in the front portion of an electric car to charge the battery in turn which is used to propel the car. may i know how much efficient it is and what are the problems may occur to implement this...

I have noticed that during traumatic events say, car crashes, Although the crash duration is less then a blink of an eye, it feels like takes much longer. I think horizon covered a research of time dilation perception that failed.* Anyway is it possible incredible powers of the crash increase...

Imagine you are in your spacecraft , and within your observable universe there is no other body. As far as you are aware, you are stationary. If you shine a light inside your craft you will measure its speed as 300,000kps, as you also will if you shine a light outside the craft. Nothing...

Homework Statement Linearize the equation y = Ae^{-\frac{b}{2m}t}, so that lny is the x variable and t is the y-variable. What happens to the slope and the intercept if you increase b? The Attempt at a Solution Taking ln of both sides, I get the equation t = -\frac{2m}{b} \ln y +...

I want to make sure I clearly identify myself as a noob. I have taken a speaker wire and spliced it 4 times throughout the length of my house and inserted an 1/8" adapter on each splice. The purpose of this is so no matter where I am at... (usually 1 of the four places) I can plug in...

I had 2 people telling me 2 different things...so I don't know the real answer. Does resistance go up or down with an increase in temperature?

I'm trying to calculate the temperature increase in a filament which a pass a current through. It's a very fine wire, so making direct measurements is difficult. Also, it's stainless steel 310 instead of a standard material. I can adjust the current, but want to correlate how the power...

Hello everyone, Ok so red blood cells break and release haemoglobin. Now I checked a book and it all it showed is that this haemoglobin binds to haptoglobin and goes to liver. Now billirubin is made by reticulocytes in spleen using haem. So does liver break this haemoglobin haptoglobin...

I want a step-by-step logical argument that show that the law of increase of entropy follows necessarily from the second law of thermodynamics . I know that this is found in many textbooks but I see that it is always incomplete.

Homework Statement Helium has the special property that its internal energy is directly proportional to its absolute temperature. Consider a flask of helium with a temperature of 20 C. If it is heated to twice its internal energy, what will its temperature be? 1. 293 C 2. 313 C 3. 40 C 4...