Rise Definition and 269 Threads

I'm not sure if this question belongs in the forum or the physics forum, I guess I'll post it there as well. I'm trying to calculate the temperature rise in a coil of wire (27AWG) wound around a toroid. The current through the wire is ~0.5A with a calculated voltage drop of 14.64mV across the...

i have a 30 ft pipe - 10" diameter. there is a constant water flow at the top, keeping the water level constant ( the pipe is always full to the top). at the bottom the water just flows out of the basin and away. the pipe is is just 1" underwater in the pool underneath. the yellow object is a...

Hi, Im just wondering, why the fermi level rise up with raisng up the temperature when donors are present in Extrinsic semiconductor? thanx

I need help with a circuit. I need to run the signal in first image through a circuit that can clean up the exponential rise and fall edges and make it more linear. Can anyone help. http://picasaweb.google.com/davidanthonypitts/SignalWaveforms?authkey=5iLxB--Xdqs#

i have a 30 ft pipe - 10" diameter. there is a constant water flow at the top, keeping the water level constant ( the pipe is always full to the top). at the bottom the water just flows out of the basin and away. the pipe is is just 1" underwater in the pool underneath. the yellow object is a...

Hello, I'm learning EM from Bleaney & Bleaney and got stuck on Ex2.1 (can do Ex2.2-2.7, though...) - If the polarization charge on the surface of a spherical cavity is -s.cos(theta), prove that the field strength at the centre is s/3e0. If I expand V(r) within the cavity as A.r.cos(theta) +...

What gives rise to natural frequency? Resonance is when an oscillating force has a frequency that matches the natural frequency of a system... but what gives rise to the natural frequency of the system?

Will oil prices rise in 2009? Or will the economy keep the prices down for a while?

Hi All, Could someone please help me with the calculations & an example of Watts consumed to Air Temperature rise in a given area: Eg: If we have a closed sealed container with no outside influences of area say 1 cubic meter, well insulated with an electrical heat source of the best...

Homework Statement A pulley fixed to a rigid support carries a rope whose one end is tied to a ladder and a man and the other end to the counterweight of mass M. The man of mass m climbs up a distance of h with respect to the ladder and then stops. If the mass of the rope and the friction in...

Homework Statement A bicycle pump is a cylinder 20cm long and 3.0cm in diameter. The pump contains air at 21.0C and 1.0atm. If the outlet at the base of the pump is blocked and the handle is pushed in very quickly, compressing the air to half its original volume, how hot does the air in...

The rise and fall of evidence-based natural philosophy. The way we think of the external physical world — natural philosophy -- has in the past often been coloured by anthro’centric prejudice and personal egotism. This perspective has gradually been eclipsed by the secular ideal of...

It is the largest single day rise ever recorded for crude prices; I think they said it is an $11 dollar rise in one day. Some analysts are predicting that we hit $150 by July.

The probability of a rise or fall in blood pressure?? I have developed a database program that searches for all blood pressure readings that are similar to the readings of any given patient. The program then retrieves the following day’s data from all the matching patients to find out what (if...

Please help me . (1)- A gun is fired vertically into a 1.4 kg block of wood at rest directly above it. If the bullet has a mass of 21 g and a speed of 310 m/s, how high will the block rise into the air after the bullet becomes imbeded in it ? (2)- A rocket of total mass 3700 kg is...

Another statistic i wonder is true. http://www.ncpa.org/pi/crime/pd081299h.html

First i thought that smoke used to rise upwards due to a 'projection' created by a chimney.. but lately when I was looking at an essence stick.. the smoke could literally go anywhere. Even the same with a burning piece of coal. Even the smoke generated at the bottom part of the coal 'envelopes'...

But here's the catch http://www.pbs.org/newshour/bb/business/jan-june08/dollarsworth_03-04.html streaming video optional So, where will the long-term balance of trade leave the US standard of living?

A freeze in southwestern U.S. and Mexican fields has resulted in damaged crops and inflated prices for imported produce such as lettuce, broccoli and cauliflower. Describe how this would be interpreted on a supply and demand diagram. Do not draw graph. *Please include one(if you can) so I...

How do you know if an atom can give rise to singlet, doublet, triplet, and quartet states? I'm having a hard time understanding this

What might be the calculated sea surface rise from a total Greenland melt? http://en.wikipedia.org/wiki/Sea_level_rise" Volume of ice in km^3 /surface area ocean km^2 = rise in km. S.A. of Earth is 510 x 10^6 km^2. ocean is 71% of S.A., or 361 x 10^6 km^2. http://en.wikipedia.org/wiki/Earth"...

The problem is: The sun is 1.5x10^11 meters from the earth. Energy from the sun is received at the Earth's surface at the rate of 1.4 kilowatts per square meter. I'm trying to find two answers: 1. This energy flux from the Sun falls on a pond of water 100 square meters in area and 0.1 meter in...

http://www.physorg.com/news115220493.html In this context, I think it is important to avoid debate about causes [AGW], and focus on the best means to avoid disasters and respond to the emergencies. San Diego did a fabulous job of managing the fires this year, but many homes were lost. Much...

Homework Statement A projectile is launched from the surface of a planet (mass = M, radius = R). What minimum launch speed is required if the projectile is to rise to a height of 2R above the surface of the planet? Disregard any dissipative effects of the atmosphere. Homework Equations...

Homework Statement A water trough is 10m long and a cross-section has a shape of an isosceles trapezoid that is 30cm wide at the bottom, 80cm wide at the top, and has a height of 50cm. If the bottom of the trough is being filled with water at the rate of .2m^3/min, how fast is the water level...

if gravitation is present, will there be a capillary rise of liquid in vaccume?

Homework Statement A triangular prism has end peices in the shape of inverted isosceles traingles with bases 60cm and heights 40 cm . It is 4m long and water is being pumped into it at a rate of 9 L/s. How fast is the level of water rising when the water is 10cm deep. Homework Equations...

http://www.denverpost.com/ci_5579483

during the sunrise and sunset, we find the sun reddish in color...why is it so...my view is that as the distance to Earth during these times is longer than mid-day, and applying doppler effect, as the sun nears the apparent wavelength decreases and so is the perceived color...is this approach...

everybody knows that hot air rises. but on thinking about heat as the knetic energy of molecules, heat transfer just becomes another word for collisions between molecules (looking at a gas) right? so surely hot air, in it's attempt to rise from the bottom to the top of a container, would...

Here's the question: If the pressure of a substance is increased during a boiling process, will the temperature also increase or will it remain constant? It seems like it would increase because boiling is basically the release of pressure to create equilibrium. Is this right? Thanks a lot.

Does warm water rise or fall in cold weather? I think it falls Does it have to do with convection??

A Venturi device has a diameter of 4mm at one end and a diameter of 2cm at the other. Air enters at 1200cm^3/m. Mercury is in the botom of the device. Assuming mercury's density to be 13700kg/m^3, and air's density to be 1.2kg/m^3, find how high the mercury rises. Assume air to be an ideal...

Algebraically calculate the Rise Time value for the sinusoidal signal at an arbitrary frequency f_0 (expressed in Hz). Assume that the signal has zero average, that is V_{min}\,=\,-V_{max} Express the Rise Time in units of the period T\,=\,\frac{1}{f_0}. MY WORK SO FAR...

http://www.latimes.com/news/local/la-me-ocean30jul30,0,7764272.story?page=1 "...In many places — the atolls of the Pacific, the shrimp beds of the Eastern Seaboard, the fiords of Norway — some of the most advanced forms of ocean life are struggling to survive while the most primitive are...

Here's yet another problem causing me trouble. I just don't understand(yet again) how to begin the problem. A little nudge in the right direction would be very much appreciated! If a heater supplies 1.8 x 10^6 J/h to a room 6.5m X 4.6m X 3.0m containing air at 20 deg C and 1atm, by how much...

Here's my question... The 1.20 kg head of a hammer has a speed of 6.5m/s just before it strikes a nail and is brought to rest. Estimate the temperature rise of a 14 gram iron nail generated by ten such hammer blows done in quick succession. Assume the nail absorbs all the energy. The...

scheduled for release by Houghton-Mifflin in September https://www.amazon.com/gp/product/0618551050/?tag=pfamazon01-20 The Trouble With Physics: The Rise of String Theory, The Fall of a Science, and What Comes Next I think the reference must be to the rise of an exclusive string research...

HI! This problem has been killing me... The Q is the following: A canon fires a canon ball which weighs 50 grams vertically at an initial speed of 600 m/s. 3 Km on top of the point where it was fired, the speed is only 50 m/s. calculate the heat during the canon ball rise. I don't know...

this is what I did: I attached a hose to an empty plastic bottle, sealed it with plastic paste and put a cork in it. When i turned the water on the pressure started builiding up. What I noticed was that when it reaches about 2 bar it gets a lot hotter. I don't know why, do you? When the cork...

If i have a barometer which reads 76cm of hg when kept in an elevator when the elevator is at rest . now the elevator starts going up with some acceleration . will the barometer read less than , greater than or equal to 76cm of hg . also explain why . what will happen if the barometer is under...

Is rise over run the way you find slope?

Ok, I already posted this a few days ago but I am bringing it back because i don't quite understand a man sits in a bosuns chair that dangles from a massless rope, which runs over a massless frictionless pulley, and back down to the mans hand. The combined mass of the man and the chair is...

A gun is fired vertically into a 1.4 kg block of wood at rest directly above it. If the bullet has a mass of 21g and speed of 210 m/s how high will the block rise into the air after the bullet becomes embedded in it? the total momentum in the system is 210 x .021 = 4.41, after the collision...

Hi Guys! well! I am studying vapor powered cycles nowadays. The topic which I am studying currently is The Rankine Cycle. I came across a question in my book . which i want you to help me out. It is said that in the rankine cycle, in the condenser, 2000 kg/s of cooling water is used to...

http://www.washingtonpost.com/wp-dyn/content/article/2005/04/26/AR2005042601623.html Why is it thought that aggression will lead to less terror? Particularly pre-emptive aggression? This is from a few months ago, and I don't know if it has been discussed already. I searched for relevant...

I'm building an electric furnace using a coiled resistance heating element. The wire is a high temp alloy made for kilns and furnaces (Kanthal A-1 if you care.) Anyway... I can't find a way to calculate how hot the wire will get based on the current load and amount of wire. If the wire is too...

EP = mgh as an object moves further and further away, the value of g decreases and approaches 0.. if this is true, then wouldn't potential energy approach 0 as well? According to my book, this is not true, the gravitational potential energy constantly rises the further 'up' you go If...

if I threw a ball straight up (including air friction), would it take longer for the ball to drop back to its original position from its max height or longer for the ball to rise up to its max height? here's what I'm thinking, on the way up, there is air friction and mg going agaist the...

ok... So, we see the sun everyday, right? So let's say you are standing on one point of the Earth looking at the sun rise... At where must you point a laser cannon in order to hit the sun dead centre? and why? :confused: