Drop Definition and 876 Threads

Homework Statement Two horizontal metal plates are 1cm apart in air. An oil drop bearing a charge of one electronic unit is balanced between the plates when the potential difference between them is 800volts. Find the mass of the drop. Homework Equations I may need to use some...

Hello everyone, curious about something here. I saw a demonstration lately were a magnet was dropped down a copper pipe and the magnet dropped very much slower than expected. What I got to thinking was, if you replaced the copper pipe with the same quantity of insulated copper wire in a...

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% ?

Why can't I add the voltage drop?? Homework Statement What are the expected readings of the ammeter and voltmeter for the circuit in the figure below? (R = 6.00Ω , ΔV = 6.00 V.) The Attempt at a Solution I already solve for the ammeter, but the voltmeter is confusing me...

Homework Statement Measure the Voltage drop and current in all element of the circuit, given the figure which has the following Resistance and its Ideal emfs; R1=20ohms, R2=70ohms, R3=55ohms, R4=45ohms, R5=30ohms, R6=20ohms, R7=70ohms, E1=15v, E2=5v, E3=5v. Homework Equations...

I am currently doing my final year project and have a few queries. I would be really grateful if someone could answer the following questions for me as soon as possible. • The requirement is to drop the pressure from 140-150 bars at the inlet of a pipe to 2 bars at the outlet of the pipe. •...

Homework Statement Problem: Create a means for the egg to land on an uneven dirt surface from a great height without breaking. Restrictions: No parachutes (or wings, or any other velocity-slowing addition,) packing materials/padding, balloons, or thick liquid substances. The project must...

Homework Statement Three batteries and four resistors are connected in a loop as shown (see attachment). What is the voltage drop across the top left resistor? Homework Equations V = IR The Attempt at a Solution This is part 3 of the 3 questions for this problem. On the other...

"Egg Safety Vehicle" (Egg Drop Project... in a car!) Hey! This is my first post so sorry if I do anything against protocol. I need to design a sort of egg protection vehicle. I will put the egg inside of the car which will in turn be rolled down a ramp and crash into one of my classmate's...

1. During a Millikan oil drop experiment, a student recorded the weight of 5 different oil drops. A record was also made of the Electric field intensity necessary to hold the drop stationary between thew two horizontal plates. Data: Weight x 10^-14 N 1.7 2.9 4.0 5.6 6.1...

I failed the first aerodynamics exam. The score makes it pretty much impossible to scrape an A in the class. So would it look worse if I withdraw from the class and retake next semester, or take the B+/- that's coming? I want to get into grad school for aerospace engineering. I currently...

I wonder if there is no table or graph with which I can make a quick estimation of the pressure drop in relation with pipe diameter and flowrate ( for 90° bends only ) ... can anyone help me with that ?? Thanks !

I am a little unsure about why the ideal diode can't have positive voltage drop... Looking back at my notes, it just simply says that "It's not a feasible solution" and that only when voltage drop is zero or negative can there be a solution.

Hello. I have been asked to calculate the pressure drop across our fuel system. It is a large system with many fittings and bends. My numbers don't seem to make sense to me Please help... Before I begin, I use equation dp=(K*density*MeanVelocity^2)/(2*g) to calculate pressure drop. To...

First, I am very confused as to the difference, if any, between head loss and pressure drop/loss. Can someone help me? Also, I know that the Darcy-Weisbach equation for head loss due to friction is hf=fL/D*V2/2g and you can plug that into get an equation for delta p that is dp=fL/D*pV2/2...

I'm currently in a Statics course, even though I am not really interested in being an Engineer (nothing against them, it's just not my favorite thing in the world). I go to a small school that doesn't have a lot of Physics courses so I just take them all. So the first test in the class didn't go...

Homework Statement I'm dealing with dimensional analysis in subject called Petroleum Engieering Fundamentals. I was told do devise the apparatus to gain the values of constants a1,n2,n5 stated below.( they are all the members of real numbers) here is the task "Your challenge is to devise an...

This is for a mechanics class. I'm sort of re-learning how to apply calculus and differential equations in this class, so I get stuck trying to figure out how to apply the math I learned 2 or more semesters ago. Any help would be greatly appreciated. Thanks, m.g. Homework Statement...

So this is the question... In the direct circuit diagram below (please see the attached file), Resistors 1 and 3 have fixed resistances (R1 and R3, respectively), which are known. Resistor 2 is a variable (or adjustable) resistor, and the resistance of Resistor 4 is unknown. Show that if...

(FYI, not a homework question) How would I calculate the temperature drop on a liquid contained in a glass bottle as a function of the ambient air temperature around it? Basically what I'm attempting to figure out is how to drop red wine to its optimal temperature of 60-65 degrees F, with...

I have a source of 800 Kilo Ohms and I want to power an LED with that source. Which I would presume the LED would have a resistance of 9.5 to 10 Ohms if I'm correct. When I connect the LED to the source the voltage drops from 12 volts DC to around 1 volts DC. If my thinking is correct the reason...

Hi, ok so everytime I think that I have understood the concept of Energy transmission, losses and voltage drop, I get even more confused about things. I have searched several threads on this forum and the physics forum but failed to find anything that directly answers my query. So I...

In Milikan's experiment, an oil drop of radius 1.64x10^-6 m and density of 0.851 g/cm^3 is suspended in a chamber where the downward electric field of 1.92x10^5 N/C is applied. Find the charge on the on drop. I know that F=qE, but the drop is suspended so it can't really a force because it...

Forgive my naivety. I used to know math, but have sort-a fallen off the bicycle some 30 years ago. I hope I don't go all ballistically ignorant. I have a problem trying to calculate muzzle velocity for pellet rifles. Specifically, I assume there is a way to do it without a chronograph and come...

If I drilled a hole all the way through the earth, and then dropped a ball down one end, what do you think the speed versus distance plot would look like? I am interested in the centre point of the Earth primarily - instinct tells me it would overshoot by quite a bit, but how far? assume...

OK well as the title says I have to do an egg drop using only a foot of tape, 3 sheets of computer paper, and 2 straws (they have the bendable end). So is there any suggestion of what will work best? The egg will be dropped from 10cm to begin with, and then the drop height will increase until it...

Homework Statement Water drips from the nozzle of a shower onto the floor 215 cm below. The drops fall at regular (equal) intervals of time, the first drop striking the floor at the instant the fourth drop begins to fall. a) Find the location of the third drop as measured from the nozzle of...

For a science project we have to make an ''egg protector''. It has to have: -parachute and -base to hold egg in (I just joined 30 minutes ago and could not find a forum like this. So sorry if this is a duplicate.) Aaaaaanyways, our group has to drop it from a 5m tall height, the...

http://www.flickr.com/photos/39972563@N04/3674854817" Its for my physics project and i have tried searching everywhere but couldn't find it. It is drop zone of kings dominion and i want to find the weight of the object people are sitting on. Basically the whole circular thing. can...

Hi, I am currently trying to do a project for my final year in engineering.I have not been able to find any software that's helping me in simulating and obtaining results for pressure drop through an orifice plate. i have tried the fluid option in ansys v10 dinn't understand how to use it...

Anyone here in the states going to be watching the ball drop on television tonight? I am.

Hi all, This is my first time making a somewhat complicated circuit, with the help of an online schematic. (http://www.dprg.org/tutorials/2005-11a/index.html ) My goal is to make a New Year's Eve ball-drop, which has a motorized controlled-release lit-up ball (on a separate power...

I have a question about network flow pressure drop. In a piping system with several identical components in parallel, is the pressure drop across the supply and return header equal to the pressure drop across one of the components? Or is it the inverse of the sum of the inverses? To use...

so I'm working on a physics lab report, and I've derived the following formula V=-N∫dB/dt(dot)dA then I used the chain rule to turn it into V=-N∫dx/dt * dB/dx(dot)dA my question is, can I pull the dx/dt out of integral? I was doing the experiment, and measured the voltage drop, and...

I am trying to help a student understand the concept of voltage drop but I'm not sure I fully grasp the concept myself. From Conceptual Physics 9th edition "The total voltage impressed across a series circuit divides among the individual electrical devices in the circuit so that the sum of...

Homework Statement A fluid of relative density 0.86 and viscosity 0.003 pa flows through a pipe of 12cm diameter. The flow rate is measured using an orifice plate with a 6cm diameter orifice, with pressure tapping connected to a differential U-tube manometer using mercury (density = 13600 kg...

Dear all can anyone explain to me the semi-empirical mass formula and liqiud drop model, I really don't understand what is the difference between them and which one came before the other. I really confused

1. The problem statement Ok so I have to have an egg drop from 6 meters onto a mechanism then from a primary sruface over a construction cone onto a secondayr surface and then the egg has to trigger a mechanical deivce that captures the egg in a unique way, trasnferring its energy back to...

Homework Statement Our lab was to predict the distance a bungee jumper will fall before coming to rest. I already found the spring constant When we have the spring constant we had to find the minimum safe drop height for a bungee jumper before being stopped by the spring. The following...

greetings what is the difference between voltage and voltage drop? in text i read as follows and i could not get When the voltage on the base is very close to 0.6v, the transistor is just at the point where it is turned ON and the voltage on the collector will be say 8v for a 9v supply...

Homework Statement ac with R-C coponents. Determine the tensiondrop over a capacitor in a circuit with ac. Homework Equations The Attempt at a Solution In the solution they use components of the V in sin and cos for the V of the capacitor but should it not be squared and then the...

Homework Statement Hi all, i have a question on thin film interference. Lets say there is an oil drop on the surface of water. Light reflected from the oil drop is observed from above. Explain why interference fringes are not seen when the thickness of the oil drop increases...

Homework Statement [PLAIN]http://img87.imageshack.us/img87/9964/impactforceonbike.png A roller is rolling with a constant speed before and after the drop. How do i figure out the impact force exerted on the wheel when it just touch the floor from a height h? Assume, angular velocity...

I'm doing a report on the principles of physics involved in a motorcycle helmet drop test. After some research I decided to talk about an example from this one article. It talked about hot a helmet strapped onto a headform, dropped onto a steel anvil, in a controlled manner, from a certain...

I don't understand the Vce voltage drop of a BJT. If I try to think of the BJT as 2 diodes - Base emitter diode and base collector diode. Vce is the voltage across the cathode of the base-collector diode and cathode of Base-emitter diode. How can it be 0.2V(when the BJT is saturated). I don't...

Hi everyone, So I'm doing some research on fluorescence and I'm puzzled. I understand that running a current through fluorescent gasses like neon cause the valence electrons to jump up an energy level, and I understand that photons are emitted when they fall back down into their default...

Homework Statement What is the focal length of a drop of water in the form of a sphere with radius 4mm given that the refractive index of water = 4/3 Homework Equations The Attempt at a Solution Here, i think i will need to assume that the light rays are coming from infinity...

Homework Statement The top of the roller coaster is 77.7m above the earth. From this height what speed can be reached when it reaches the bottom of the drop? This problem must be solved using work and energy equations not kinematic equations.. Homework Equations Wg=-(mgyf-mgyi)...

Homework Statement Ram/Ballistic = 6 Foot long 225 lbs Suspended 12 Feet by 2 Cables Homework Equations Drop required to achieve 10 fps Velocity at lowest point? The Attempt at a Solution = 10*10 / 5.36

Hi, This isn't actually a homework problem, but rather I'm just trying to understand a few things. It's pretty simple though, so I thought this would be the best place to post. I don't care so much that I'm getting the correct answer, as much as I care that I'm understanding the situation...