Drop Definition and 835 Threads

Ok, let's say you have a 100v voltage supply and two 50 Ohm resistors in a series circuit. The total resistance is 100 Ohms, leading to a current of 1 amp. Now my question is, what exactly is voltage drop? I know the voltage drop across each resistor is 50 volts. If we were to look at one of...

Homework Statement http://imageshack.us/a/img197/3519/circuith.png Equivalent Resistance of circuit = 17.31 Ω Homework Equations V = I * R The Attempt at a Solution Total voltage of the circuit, if I'm doing this correctly should be: E = (3.00 A) * (17.31 Ω) = 51.93 V...

Homework Statement I did the lab and have to analyze the data to determine the quantized charge of an electron. I have used the data to determine the 'total' charge on the observed drops using the following equation.Homework Equations q = 3 ∏ r (E) η (Vup+Vdown) Where r is the known radius of...

I have a big exam on Wednesday. It's the last one before the drop date. I just need all of the help I can get. Any help would be appreciated. Here is where I am right now: I want at least a B on this test. Made very bad grades on first two tests. However, if I get good marks on last two...

The project requires me to build an Egg-Drop Vehicle that is ranked based on volume*mass (So ligher/smaller is better). And, of course, the egg can't break when dropped from 20 meters. critique my design please: http://img138.imageshack.us/img138/8872/eggdrop2.jpg Any suggestions or...

Millikan Oil Drop Experiment -- A few questions Homework Statement I'm currently doing the millikan oil drop lab; we're using a PASCO Scientific Model 300a (fairly ancient). Specifically, my partner and I are having major problems making any of the droplets in the viewing chamber go back up...

Hello, I'm struggling with the following problem. We have a dryer in our plant which evaporates acetone and with a blower the vapour is driven to a scrubber. However the efficiency of the scrubber is not sufficient and that is why I want to place a plate heat exchanger in the vapour line to...

I am a sophomore math and physics major who would like to go to study biological physics as a graduate student. My aim is not to go into the medical field, i.e. Hospitals, pediatricians etc. but my interest generally is to research ways to prolong the human lifespan. Lately I have been thinking...

Hello, everyone, I am doing an egg drop for my science class, (not sure where to put it so I put it here, sorry if it's the wrong place.) and I have developed a few designs. I would like to know which you think would be most successful. (Dropped from gym class bleachers.) Parameters: Must...

Having a little trouble with this latest advanced egg drop assignment. The main assignment has two parts - 1. Create a rocket that can reach a minimum height of 120 ft 2. Create a vehicle that can land with an egg for a passenger, and not have it crack. We also aren't allowed to use...

I've posted a thread awhile back about whether my work load for this semester is manageable. The courses I enrolled in were: QM II Nuclear and Particle Physics Mathematical Methods of Physics PDE Abstract Algebra After some serious consideration, I have decided to drop one of the...

Homework Statement Suppose I drop a ball from high enough in the sky that, at some point, it reaches terminal velocity. At this point, the ball is no longer accelerating. It is traveling at a constant velocity. Does this mean that at terminal velocity, the force of gravity on the ball is...

My chemistry teacher recently explained the Millikan oil drop experiment to us. However, he rushes his lectures to the point where it is almost impossible to ask him questions. What I was wondering in regards to this experiment is why is the positive plate used in the experiment? I...

Hi folks, my prof gave us some problems calculating pressure drop in two phase flow. She did some examples and somehow she got the density of water-liquid and water-vapor from steam tables, but she did not explain how. I have never used these. I am especially stumped on the density of...

I'm given a strange single-diode circuit where you must find out whether or not the diode is on. See the top diagram in the linked image: http://i.imgur.com/y1sn3.png (Current source is indeed 1 Amp, not 1mA as the 2kΩ resistor would suggest. Please do not try to correct the initial question...

First, this is just something I've wondered for fun...not serious, and just wonder if if the laws of physics make this possible. Would it be possible to create a drop pod shape such that a person could be dropped from a helicopter from a high altitude and have it hit the water (ocean) such...

hi guys OK, this has annoyed me for some time. I like my cups of noodles. The pack of noodles and sachet of flavour powder (obviously dry) go into the cup with hot water poured on them. Now if I fill the cup to the brim with the hot water, it will start to lower in level over a period of...

I am contemplating dropping out of school right now and taking a year off doing work. Then coming back to a school later, hopefully a less expensive one, where I can take classes only focused on the subjects I want to do in science. My interests are math and physics as well as biology and...

In the bean machine, we usually drop the balls from the center of the top right? That's the reason why most of the balls accumulate in the middle bin. If you drop the balls from the top right corner (say) then balls should fall in the bins in the right side, right? Thanks a lot.

I am doing a simple steel ball drop test on glass to see if the glass passes the standards. We are dropping 1.18 inches (0.535kg) steel ball at the height of 51inches (1.295m). Now, I can calculate final velocity at the impact, but cannot calculate the actual impact force. One of the method...

I completed the Millikan oil drop lab in class with as much accuracy as possible. I used the PASCO interface and used a very accurate Air pressure calibration. My final experimental charge of the electron derived from the equation in the lab was, 1.8 x 10 ^-19 C. When I turned in my lab, I was...

Hey guys, I am new here so I figured I would post a problem I am having and see what comes out. I am designing a circuit that will force a voltage across a proprietary load that I cannot divulge on, but for this example we will assume it's resistors. So far everything works great but I am still...

Hi Guys, I have a model gas turbine that is driven by an ecu ... the ecu starter output is 12.6volts but the starter motor is rated to 6volts. The ECU can easily supply 20amps although the starter motor is rated to 5amps max efficiency. I need to drop the voltage from 12.6volts to...

1. An electrically charged macroscopic spherical oil drop of mass M=5.449x10^(-14) kg is released from rest between two electrically charged horizontal plates that produce a uniform electric field magnitude of E=1.667x10^6 N/C that is directed vertically upward. If, after release, the oil drop...

Hey all, I'd need help with determining the pressure loss over an orifice in a pipe. I have an equation for the friction factor so no problem there, and I know the Reynold's number as well. What confuses me is choosing the suitable velocity for the pressure drop equation; \frac{Δp}{ΔL} =...

Dear Experts I just connect a diode to a battery rated at 4.2 volts. The diode takes about 0.8volts ( i thought should be 0.7v but measurement says 0.8v) and the battery is currently at 3.12v. The supply voltage is 5v dc. After some time, if the battery reaches 4.2v, would current...

Universe is expanding but is it due to drop in gravitational forces all over in the universe ? Gravitational force holds all the objects together in the universe ...? Universe is expanding means one object is moving away from another, Is this due to drop in Gravitational force ? If Yes...

Let initial preasure (P) = 10 bar,volume of container (V)=100000 cubic cm. At what time period pressure will become 5 bar.

Electrical question: I live in Mexico ( retired ex-pat ) and my electrical supply ( 240 volt single phase ) comes through a transformer that is almost 1 km away from my house. The supply lines are 2-0 aluminum. Because of the distance and from usage by others on the line, the voltage is...

I must have been asleep in physics when we did torque (well it was a while ago, before I discovered beer) and am re-visiting the subject afresh. I am trying to choose a motor to lift a pop-hole door to a hen house. The motors I'm looking at have a torque rating from 400 to 1000 gf.cm, which I...

So here is the problem I have. There is a box that is 27.5" tall and 41" tall with a mass of 480lbs. One edge is put on a 3.5" tall block while the other is raised 12" and dropped. The question is to see if the block will continue to rotate and fall on it's side. I have been able to find the...

Homework Statement A spring is standing upright on a table with its bottom end fastened to the table. A block is dropped from a height of 3.0cm above the top of the spring. The block sticks to the top end of the spring and then oscillates with an amplitude of 10cm. What is the oscillation...

I am just curious as to why people drop out of graduate school.

1. The question asks, why is the external chamber in the Millkan Oil Drop experiment so large? The Millikan Oil Drop is a classic experiment for determing the value of e, fundamental charge, on an electron. In my version of the experiment, I spraw droplets into an external chamber, and then...

Hi i built a circuit for a project and I am having some trouble working out important factors of the circuit. My circuit is powered by a 12V power supply, its wired in series, it contains 85 LED's that are connected with a 1kΩ resistor across 3 off the LED's. This is then connected to a PIR...

Homework Statement Trough a capillary with an inner radius r=1mm water flows in a form of small spherical droplets. What is the radius of the drops, the number of drops in m=10g water and the time needed the water to expire, if the surface tension of the water is =72x10^-3N/m, and the period...

I have just wired up a LED circuit in series of 3 with a resistor of 1000 ohms 1.6W on each 3. Its being supplied via a 12 V battery. The circuit is wired up to a PIR which when detects movement the LED's will light up. I need some help working out how much current will be running throughout...

in physics we have to drop an egg 30ft and the only materials we have is 60cm of half inch thick clear tape, three sheets of paper, and four straws I am thinking about making helicopter blades for it and putting it in a modded paper water bomb with straws and paper bits as cushions but idk if...

Homework Statement The values for the charges on oil drops are 3,99 6,65 2,66 10,64 3,99 and 9,31 all these multiplied with x10-19C. What is the largest value of the fundamental unit of charge that is consistent with the measured charges? Homework Equations Fundamental unit...

I want the LED to be off when there is a certain input voltage let's say 5v (the exact value doesn't matter), but when that voltage drops I want the LED to turn on. I would also like the LED to remain on even when the voltage goes back up to 5v. I was thinking of using some sort of logic gate...

Good evening. I have been wondering what causes quantum systems (or systems in general) to drop down to the lowest energy state. A hydrogen atom absorbs a photon, its electron "jumps" to a higher energy level, and that excited state lasts for only an instant before the atom emits the photon to...

Along a horizontal pipe I am getting a pressure drop of roughly 10-20 kPa every 20 metres in a 6.5" (OD) water pipe. This seems much to high and I am thinking the pipe may be stuffed and thus there is to much friction which is reducing the pressure of the water. Just wanted to get some other...

Homework Statement A ball is dropped from a height of 24m and rebounds to a height of 16m. If each time it rebound two-thirds of the previous height, find the total distance traveled by the ball. Homework Equations The Attempt at a Solution I thought this might be a problem...

I have noticed when sitting in the sauna that when you throw a couple cup sof water on the sauna rocks that the thermometer on the wall drops in temerature before slowly starting to climb back up, at the same time the thermometer drops your skin feel slike you have doubled the temprature! I...

In my Honors Physics class we were assigned to construct a egg drop contraption solely out of tape, popsicle sticks, and paper. The first time I constructed it I made a paper parachute and attached a paper cone to the parachute (to hold the egg). Unfortunately, the egg broke upon impact. Any...

hi everybody, I posted this in an engineering forum but I think it's more relevant here, because it's really just a question of fluid and Newtonian mechanics. I'm working on a project where I'm trying to measure raindrop parameters, and one thing I'm looking at is the sub-terminal speed...

Blood is in continuous contact with itself. Thus any pressure on artery blood is pressure on vein blood. So they have the same pressure. What am I missing here?

A 3v battery is connected to a capacitor and 2 light bulbs all in parallel set up 1. Where is the total voltage drop at t = 0 2. Where is the total voltage drop at t = infinity 3. Which light bulb is brighter? From my understanding, since this is in parallel set up at t = 0 the voltage...

Hello guys, so I had a homework and I couldn't understand the point of my teacher. The question goes like this: http://desmond.imageshack.us/Himg3/scaled.php?server=3&filename=21976607.jpg&res=medium So the question is, "Calculate the voltage drop over the TRAIN when it is at the...

Homework Statement An electron moving horizontally at 2.50 x 106 m/s enters a 150 N/C electric field exactly half way between two horizontal parallel plates and follows a parabolic path downwards. Both plates are 14 cm long and spaced 10 cm apart. Determine the vertical displacement of the e-...