Drop Definition and 876 Threads

i am trying to figure out the relationship between diameter of a drop of liquid, its density and its shape. Can somebody explain to me the following two lines?

Homework Statement I'm trying to calculate the voltage drop across a 60uF and a 30uF capacitor in series, powered by 60V. Is the formula for voltage drop across capacitor opposite of the formula for resistor, where resistor is R1=R1/(R1+R2) while capacitor is C1=C2/(C1+C2)? Homework...

Hello! I am studying the mentioned topic I am confused in calculating the average value of friction factor in sub channels ... please help ?? thank you in advance

Hello! I am studying the mentioned topic I am confused in calculating the average value of friction factor in sub channels ... please help ?? thank you in advance

i am a physicist now i am doing Ms in nuclear engineering ... i need to understand basic concepts ... neutron transport equation ? what is the transport phenomenon actually ? and pressure drop calculations in core ... please help thanks in advance

Homework Statement I have recently performed an experiment where the voltage drop and current through a diode were measured. I am wondering why the voltage drop across the diode changes. Theoretically, the voltage drop should stay the same as there is a certain amount of energy required to get...

Homework Statement [/B] Determine the resistance of a conductor and the volt drop per ampere metre at 70°C for a 95 mm2 pvc/swa/pvc copper cable. The temperature coefficient of resistance is 0.004 per °C. Homework Equations [/B] R70 ( resistance at 70 degrees ) = R20 [ 1+( temperature...

I don't understand why the voltage drops only when the charges in an electric circuitnpass through resistors or electric devices, but don't drop as charges move through the wire. As charges move through the wire due to electric potential differences, from a high potential to a low potential...

I've came across many references for pressure drop calculations for dilute phase pneumatic conveying, but I've yet to encounter any for dense phase. Anyone has any idea how do i calculate that? Thank you

Homework Statement Suppose a rain drop with mass ##m_0\neq 0## is falling due to gravity with initial velocity ##v_0##, assume ##\frac{dm}{dt}=k=##constant. Solve the differential equation and determine the velocity as ##t\to\infty## Homework Equations ##F=\frac{dp}{dt}=\dot{m}v+m\dot{v}## The...

I have several problems regarding this/these topics. Is anyone available to tutor me right now? Thank you.

I've been admitted to UT Arlington with 100% tuition scholarship. However, even after the scholarship, the living expenses are quite a bit for me (however, with on campus jobs and all, I believe my family will be able to manage so I think that I'll leave the financial issues aside). I'm not...

I have a scenario where a specific nozzle is defined to have a flow of 900cc/min. The flow co-efficient for this nozle is defined @9.8 MPa -> flow co-efficient= 0.85. If I then run fluid through this nozzle at say 200 MPa and I would like to calculate the pressure drop. My understanding is taht...

Dear All, I know this may sound a bit of a broad approach for a question but I would like to know what equipment I would need to create a very high electric field in order to levitate a non-highly conductive droplet (from water to water + salts but not metallic, in the milli-microscale). I will...

Homework Statement A tennis ball has a mass of 75 g that is placed above a basketball has a mass of 590 g. Both are stationary and They were dropped from a height about 1.2 m ( The collisions are perfectly elastic) 1) Calculate the speed of the basketball when it reaches the ground 2) Calculate...

How do I determine the pressure drop of air across an opening? For example if I have 3,000 L/s (3 m3/s) and an opening of 8.4 m2 I know the velocity is 0.4 m/s. If the free area is 80%, the velocity increases to 0.45 m/s. What I'd like to cal is the pressure drop in each case. Cheers

Homework Statement The classic double ball drop question: a ball of mass m is placed directly above another ball of mass M, and assume that m is not negligible. Both balls are dropped simultaneously. Find the mass m such that, upon the second collision (m with M), M has a final velocity of...

Homework Statement "In a jump spike, a volleyball player slams the ball from overhead and toward the opposite floor. Controlling the angle of the spike is difficult. Suppose a ball is spiked from a height of 2.30 m with an initial speed of 20.0 m/s at a downward angle of 18.00°. How much...

Homework Statement When Millikan first performed this experiment, he used water droplets instead of oil. He found he could not suspend the droplets; they would start to move up. Why did this happen? Homework Equations N/A The Attempt at a Solution The water droplets would have been so small...

Homework Statement A voltage divider with two resistors R1 and R2 is given. The output is connected to a transistor so VB is always equal to the base emitter voltage=0.7v. Homework Equations How can i explain physicaly (wath happens to the electron flow and such) why when R1 is verry high, VB...

Hi all, I am currently taking calc 2, physics 1, engineering statics and two gen eds. I am struggling in my statics class mainly because I am having a very difficult time understanding vectors. My academic schedule has me actually taking it my third semester (i'm currently in my second...

What is the reason that the pressure drops in the central circulation?especially if you go from arteries to arterioles you get a huge pressure drop. If you look what is changing if you go from arteries to arterioles then it is that you get many many branches this leads to an increase of total...

Our class is making an egg drop design but the rule is we can't use any tape or glue and we can only use these materials Balloon, toothpick, string, paperclip, straw, cotton ball, pipe cleaner, rubber band, paper, cup, newspaper, and plastic sheet

Homework Statement as we all know , D=4R , D=hydraulic diameter , in the equation of P= (8μLV_avg) / (R^2) , i would get (128μLV_avg)/ (D^2) , am i right ? why the author gave (32μLV_avg)/ (D^2) ? Homework EquationsThe Attempt at a Solution

Homework Statement Power station produces AC power at 2.5Mw, I = 100A. Transferred along 100km line with a resistance of 50 ohms to a factory. Calculate power lost and % efficiency Homework Equations P=VI P = I2R The Attempt at a Solution Initial power at the station is 2.5x106 . Using I2R...

Homework Statement I have an egg drop project in my high school physics class, dropping 2 eggs in one device from 6 meters up. There are some certain guidelines. I was just looking for some tips or ideas of what I should do. So here are the guidelines: - Device has to hold 2 eggs. - It must...

I am trying to understand the physics of dropping a bomb from an airplane for a bombsight simulator. In particular I'm trying to understand the effects of drag on the bomb in flight. Let's say that a bomb, shaped like a blunt bullet, has lower drag in the forward direction than it does...

All the videos I've looked at uses straws, but doesn't wood absorb the impact better? Is there a way to do a hybrid wood/straw setup for maximum absorption? Also, how is my idea? I am going to make a bedding from yarn and make it fairly tight. Then I'm going to connect to 4 popsicle sticks...

Hello there, So I'm 23 years old, been passionately studying physics for some time now. Oh it's been fun and fascinating, I wouldn't trade it for anything. I could apply for my B.S. in physics any day now. I've always been great at physics. My conceptual understandings, my neat and unique...

Hello, I read something about the pressure drop across a valve and it was specified this is a singular pressure drop equivalent to K*U²/g (Borda formula). My question is, can we used the Bernouilli formula for a permanant incompressible flow to determine the flow rate function of the pressure...

Hi, I have a egg drop competition coming up, and I am only able to use: Duct tape Hot Glue Egg 50 Wooden Craft Sticks I have no idea where to begin. The egg will be dropped from 3 meters. Any ideas?

Homework Statement The question is: What's the voltage drop between point A and B ?? (Suppose that E2 > E1)2. The attempt at a solution First, I need to solve the current flowing in this circuit, which can be done using KVL. The current flowing is ##\frac{E_2-E_1}{R_1+R_2+R_3+R_4}## (which...

Homework Statement In an oscillating series RLC circuit, with resistance R and inductance L, find the time required for the maximum energy in the capacitor during an oscillation to fall to 1/5 its initial value. Assume q = Q at t = 0 Homework Equations ## U(t) =...

Homework Statement For my egg drop project, the requirements are different than anything I have seen on other forums. Basically the only rule is that it can't be bigger than 3x3x3 inches. We can use any materials except anything peanut related (allergies) and will be dropping our containers...

A building has a water pipe inlet. I have found that at if I open the valve at this location fully, then I get 180 liters per minute at a residual pressure of 0,2 bars (static pressure is 5,4 bars). Is there a fixed relationship between the flow and pressure drop so that I can easily predict...

Objective: Design/construct container to safely land a raw egg when dropped onto pavement from top of bleachers. Materials: Standard Toothpicks, Standard Straight Drinking Straws, Standard Sewing Thread, Cardboard, Masking Tape Requirements: Egg cannot crack. Container mass < 30 grams without...

Here's my situation: Undergraduate at university as a sophomore with around 100 credit hours right now. (took a lot of electives, still have a lot left). Coming into this semester I had the lofty idea of going for 3 majors (Phyiscs/ Math / Earth and Environmental Science). I soon realized that...

Homework Statement Homework Equations Hello, i have been thinking, what couses a dc motor to have let's say 6volts drop across him. I was thinking that since it is just a coil it should have a verry little voltage drop, but afted testing on breadboard i figured out that it have near 6 volts...

Hey Guys! Anyone able to help out here? I have already happily solved for T2 = 369.91K and m2 = 11.492kg However, for question 2.3, I'm terribly stuck. I'm not even sure what to make my control surface. How can I relate pressure outside the valve with the two thermodynamic states I have...

I have not found a straightforward explanation on how to perform voltage drop calculations for cables used for instrumentations purposes. Suppose you have Current Transformer (CT) and Potential Transformer (PT) connections coming into a relay (IE SEL421). If we have a cable that runs from the...

Homework Statement [/B] Our teacher has given us the weekend to go and work on the Egg Drop project. He's restricted us to 20g total mass and 6cm * 6cm * 30cm in size. Food, foam, bubble wrap is prohibited. Parachutes can be added but can not make it exceed 12cm * 12 cm * 30cm. So that's what...

Hi guys, I don't know if you can help me, or if I am asking my question correctly but your feedback will be greatly appreciated. I have a 2" piping system that connects a scrubber that is rated for 675 psi (36" OD x 7'-4") to another scrubber rated for 75 psi (84"ID X 24'- 0") ; there is a...

Just a thought: The momentum quantum number given for s states is l = 0. If an S state electron dropped in energy, and emitted a photon with l = 1, what would take place? Am I correct that the electron could only drop to a lower l = 0 (an S state) orbital?

i am wondering would that be possible to make a prince rupert's drop with metal.. would it end up having similar properties? (ie high compressive stress => stronger) or does molten metal flow too quickly?

Homework Statement A hot air balloon containing an AP Physics student ascends vertically at a constant speed of 8 m/s. While ascending, he accidentally drops his rubber duckie from the gondola of the ballong. Seven seconds after it is dropped the duckie bounces off a roof at point A and hits...

Hello I'm relatively new to teaching physics and was wondering if you anyone had advices as to the parameters to put on this challenge. How high should I drop their containers from? 2nd or 3rd story? When I was in school, I think we could only use glue and toothpicks, but I don't remember...

Hey guys! I am a 4th year Physics university student and I wanted some advice on what class(es) I should consider dropping. I am taking too many challenging courses and I really do need to drop one or two classes. Here are the list of classes that I have and a short description (and a personal...

Hello, I want to calculate the Thevenin/Norton equivalent of a circuit with a dependent current source. I tried to analyse the circuit using loop equations but i don't know how to calculate the voltage drop across the current source. Any help would be appreciated.

if an voltage is applied in an electric circuit connected to a resistor voltage drops across the resistor right? how much time it takes in that process? does it occur instantly?

In synchronous generator, how does armature reaction cause a 'drop' ? How is it different from the leakage reactance of stator windings? I can't visualize it..Please help..