Drop Definition and 835 Threads

i don't know how to describe the relationship between surface tension and the shape of a liquid drop. Also what are the attractive forces that increase surface tension?

heya, I've been given a set of data and told to do some calulations with it, the data was collected from an experiment where a mass was dropped through a light gate from different heights and the speed was measured. I have some basic things I know how to do but after that I'm not sure...

My fluid dynamics is rather weak and i was wondering if someone could please tell me how to calculate dynamic head of the flow in the a tube and how to calculate pressure drop of a hole in a tube? Some formulas would be handy thanks engineering

So do you ever drop your baggage and fantasise? to date mine is finding a fabulous gold hoard and becoming independent.

Homework Statement Below, I have attached a schematic that was on a test question for me. (NOTE: R4 = 4*r) We were supposed to find the current leaving the battery in terms of R, C, and Vb. The thing was, I had no idea what the voltage drop across the capacitor would be since there is no q...

I'm in need of some assistance in calculating some flow vs pressure specifications, in order to make some changes to the system. I have a PRV valve that has a preset setting of: PRV NO.1 & 2 SET PRESSURE = 1034 KPA (150 PSI) @ 0.63 L/S (10 USGPM) Meanwhile the design criteria states the...

Alright, I am in Physics and my teacher is doing the typical egg dropping experiment BUT! we have rules 1. the volume of the container can be no bigger than 12in. by 12in. by 12in. 2. we can only use raw eggs, and the egg can't be drained 3. the container can't contain any fluids, or gels...

I am currently taking 5 classes and a lab. Dynamics Electromagnetism Circuits Intro to Computer Engineering Differential Equations -Intro EE Lab I am kind of feeling overwhelmed, I just transferred to another school and I guess I kind of got overanxious and took too many classes (not used to...

Homework Statement A refrigerator is marked 80W and 250 V. What is likely to happen if the voltage falls to 50V? Homework Equations P=V^2/R V=IR The Attempt at a Solution --------------------------------------------------------- R=V^2/P =250*250/80 =781.25 ohm Assuming the...

Homework Statement Can an electric field drops exponentially? (in free space)Homework Equations Starting from a hypothetical potential, V = F(x,y,z)e^{-y^2} which decays exponentially in the y direction \nabla^2V=0 The Attempt at a Solution \nabla^2V=e^{-y^2}(\frac{\partial^2F}{\partial...

Is there any situation where the electric field drop exponentially in free space? thanks

Homework Statement You are on the roof of a physics building, which is 46.0 m above the ground. Your physics professor, who is 1.80 m tall, is walking alongside the building at a constant rate of 1.20 m/s. If you wish to drop an egg on your professor's head, how far from the building...

Hi all, I'd like to ask for your help in solving a problem. I'm currently working on building a small ground robot for a certain research problem. The robot is powered by batteries, and consumes a continuous 80A @ 12V when all of its systems are active. The batteries provide capacity for...

Find the voltage drop across the capacitor In a circuit where a voltage source is connected to a capacitor and resistor in series and then connected to another resistor, shouldn't the current going through the capacitor be 0ma after 5 time constants, resulting in a Vc being 0?

Hi everyone. I'm currently in the second semester of my second year, doing a combined degree in physics and astronomy. I really love physics, and have no doubt I will continue in that direction. However, I've always been interested in astronomy outside of school... So it seemed like the...

Homework Statement A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 8450 N/C. The mass of the water drop is 3.80 10-9 kg. (b) How many excess electrons or protons reside on the drop? Homework...

Hi, I am new here so please bare with me. I know a bit about electrical and Electronics but I do not recall the formula for this application...it is a long question..please help! Here it is. Six cells are connected in series to form a battery. Each cell has a rating of 1.5 volts and 1 amp...

Why don't we drop medical waste and nuclear waste into active volcanoes? Aren't the temperatures in these volcaneous high enough to obliterate hazardous waste?

Homework Statement A package is to be dropped from an airplane so that it hits the ground at a designated spot near some campers. The airplane, moving horizontally at a constant velocity of 140 km/h, approaches the spot at an altitude of .500 km above level ground. Having the designated point...

My back story is below if you care to read it, but my questions to you are: What was your experience after quitting your PhD program? Do employers look down on the fact that you got out of a PhD position without completing it? Did you continue to pursue employment in the same field that you...

Hey Guys, I know that this has been posted before, but mine is slightly different. Our instructor only provides: 5 medium rubber bands 5 sheets of 8.5 X 11 paper 20 inches of scotch tape 20 inches of string We can only use the materials he provides us. Can you please give me...

Homework Statement I am currently doing an investigation into the reaction between different acids and magnesium metal. I want to try and show that by using a large volume of acid the concentration drop as the reaction progresses is significantly reduced. Is there any way of doing this...

Im doing millikan's oil drop experiment as my A level physics coursework to eventually calculate the electronic charge. I am fine with all the theory but what I am really struggling with is the actual practical experiment. I have seen the oil drops a lot and have managed to manipulate them...

Homework Statement Hi everyone, I am working on Millikan's oil drop experiment. The first 2 columns were given to us, while we figured out the rest (chart/formulas below). I now have to complete another column beside "Mass" with the caption: "Excess Electrons" My teacher said that he...

Hi, I am having a problem with my lab report and am hoping somebody can help me understand it better. Here is my problem: I set up a series circuit with 5 resistors of 427 ohms each. The voltage of the battery was 8.70V to start. Once the battery was removed from the circuit its...

Homework Statement Hey, I was wondering what the proper section to post this in, and if it is okay to post it: I have to do a project that goes something of this sort: Basically build a vehicle no more than an empty mass of of 50 +/- 5 grams, and drop it from a point of approximately...

Homework Statement In a ride called Drop Out, riders are spun in horizontal circles of radius 5.5m, which forces them to the outer wall. When they are spinning fast enough, the floor drops out, and they are suspended by friction. The coefficient of static friction is 0.28, how many rev/s must...

If you are standing atop a 2 story building and fire a bullet vertically towards the ground and drop one from the same height will they arrive at the same time? I am not a physics person but my girlfriend is in it now and tells me that they would arrive at the same time. I don't see this to be...

I know there are already many threads on this topic but i could not find any that relate directly to my guidelines. I have to drop an egg from a height of about 40 ft., and i can only use cardboard and tape to protect it. The more it weighs, the lower my grade is, and the egg must be visible...

Homework Statement A pair of power transmission lines each have a 0.850 Ω resistance and carry 779 A over 9.85 km. If the rms input voltage is 39.5 kV, calculate the voltage at the other end. Homework Equations The Attempt at a Solution

I have to do an egg drop lab (be able to drop an egg from 10m without it cracking) what should i use- toothpicks and glue for "controlled crushability". In other words, the egg would break the toothpicks when it lands so it would not crack. This sounds good but the problem is that the parameters...

Homework Statement In a Millikan experiment the distance of rise or fall of a droplet is .60 cm and the average time of fall (ie field off) is 21.0 s. With the field turned on, the observed successive rise times are 46.0, 15.5, 28.1, 12.9, 45.3 and 20.0 s a) Prove that charge is quantized...

yes, the famous egg drop experiment. i really need help with ideas on what to construct...i was thinking that i would put a small box cushioned inside with toilet paper or tissue paper and lined with folded(like an accordion) paper / inside a bigger...the problem is: • The over all dimensions...

Homework Statement A 6V DC voltage source is connected across both a 5kohm resistor and a 10 nF capacitor in series. The voltage drop across the resistor is what? Reply With Quote Homework Equations Q=CV The Attempt at a Solution Q= (10*10^-9 F)(5000ohms)

Homework Statement Im sure most of us have heard about and done an egg drop project sometime in our lives, and right now is the time to do mine. We will be dropping the egg that is inside of our project from the second story of a building, and then from the third story. We are allowed to...

How far will a column of a fluid with density p1 fall if it is inside of a tube (open to atmosphere at the top), inwhich the tube is inside of a tank of another fluid with density p2 (p1 >> p2)? Assuming that the tube was intially plugged at the bottom while filling it with the higher density...

Friends: Let's say a 1 kg. mass is droped a negligible distance above a table. What is the maximum force exerted on the table? What would the force be if the object were dropped L meters above the table? Thanks amigos! -MigsP.S. This is not a homework question! I finished M.E. a long time ago!

My chemistry professor was discussing Milikan's oil drop experiment today, and she said that he determined the mass of the oil drop by measuring its speed as it fell. (I found this further description online) If that's the case, why doesn't air resistence appear in the equation Eq=mg from which...

Hi, 1) Can anyone explain to me from a conceptual standpoint, why increased current leads to an increased voltage drop across a resistor? Mathematically, I know V=IR. But it doesn't make sense to me why increasing a current across a resistor would lead to a greater drop in energy per...

hi! i want to calculate pressure drops in a pipe having various elbows ,bends & valves.whts equation should be used to calculate the pressure drop. thanks gaurav

By passing warm air through a cotton sock acting as a wick immersed in water, how can I calculate the maximum evaporation to achieve the gratest temperature drop in the air flow? What is the typical formula for temperature drop in evaporative cooling models?

angle of incline is 45 degree, length of the incline is 30m, and the the time of drop is 2.14 1- what should your velocity be at the base of the drop (frictionless)? my answer: average v=d/t v=30/2.14=14.0*2=28m/s 2- what is you velocity at the base of the drop...

In an early set of experiments, Milikan observed that the following measure charges, among others, appeared at different times on a single oil drop. What value of elementary charge can be deduced from these data? 1) 6.563 x 10^-19 C 2) 8.204 x 10^-19 C 3) 11.50 x 10^-19 C 4) 13.13 x 10^-19...

Hey, is there any program that's easy to use for writing formulas on the computer (I'm thinking like a drag and drop type deal), preferably one that translates the formula to LaTex? I'm on Mac OS X. but I'm sure there has to be a web applet somewhere on the net that does this? thanks!

A positively charged oil drop is injected into a region of uniform electric field between two oppositely charged, horizontally oriented plates. If the electric force on the drop is found to be 8.60 × 10−16 N and the electric field magnitude is 153 V/m, what is the magnitude of the charge on the...

Homework Statement A spherical drop of water evaporates at a rate proportional to its exposed surface area as it moves.Set up its differential equation of motion.Find the time needed for complete evaporation.What is the velocity at that time? Homework Equations The Attempt at a...

Hi, I need to make a simple and cheap device that I can water droplet at a constant rate (from a bucket of water). The size of the droplet doesn't matter, it just needs to be dropping at a constant rate (at least for a day). So I was thinking, can I achieve that by putting half of a cloth...

Anybody know a good way to stop the force from reaching or crushing an egg using poster board tape and balloons? I was thinking bout making a pyramid or rounded pyramid and making the tip heavier and then putting multiple layers of baloons and the egg at the farthest point from impact... Any ideas?

How do u calc pressure at each end of pipe if u know its turbulent and u don't know the length. Just got viscosity, density, temp diff at one end, D. Cheers.

I missed a week of school last week, and came back to class to find that we have a naked egg drop project due tomorrow. I need to do the entire thing tonight. Does anyone have any suggestions on how to make a good naked egg drop platform (base the egg is dropped into). the egg will be dropped...