Drop Definition and 835 Threads

Homework Statement I was wondering if you guys could see if my equation on bullet drop is correct. I know there are more factors than what I am presenting, but this is only a simplified version... The distance an object with 0 initial vertical velocity falls is d_{drop}=\frac{1}{2}gt^{2}...

Homework Statement Has anyone ever been on one of these. (I admit I have always been too chicken.) Can anyone explain to me what was felt at the bottom of the first drop and the physics why that was so. Also, estimate the time when the car began to slow down as a fraction of the total...

Okay, I am totally baffled here. For our final project in Algebra we have one class period to build an egg drop carrier. The egg will be dropped from 8 feet, and we have VERY LIMITED materials. - 8 Straws - 1 6x6 Piece of Thick Paper - 3 Tissues - 2 ft. of Masking Tape Another rule is that...

Homework Statement 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...

Homework Statement heres a picture of the problem. Please don't give me the answer just tell me what are the steps to complete it. thanks. http://i307.photobucket.com/albums/nn296/alan1592/download-1.jpg Homework Equations V=IR The Attempt at a Solution 1/6+1/3=2 Ohms

Hello everyone, If this is a vessel the hydrostatic pressure would drop along the vessel due to resistance. My question is why does hydrostatic pressure drop if hydrostatic pressure is due to gravity. Gravity is always there, even if the molecules lose hydrostatic energy, they would gain it...

So we have an egg drop project due at the end of the semester for my introductory physics class. We're dropping it from the second story, which is about 3 meters down I believe. The materials we are given are 20 drinking straws, 30 cm of tape, and 1 8x11 piece of paper that we can cut/fold and...

On a test in college I was asked to find the current flowing through a resistor and lightbulb on a simple circuit with a battery, resistor and lightbulb. I was told the resistance of the resistor and was given a voltmeter so I measured the voltage across each of the components but when it came...

Homework Statement I'm doing an experiment on the relationship between the time it takes for a line of dominos to drop and the constant distance between each domino. I plan to try different distances to get different times, but I don't know what my graph should look like, nor do I know if a...

Air pressure drop in Space (please help!) Homework Statement A space capsule, which may be treated as a sphere of radius 10 m, is hit by a micrometeorite which makes a hole of diameter 2mm in its skin. Estimate how long it will take for the air pressure to drop by 30%. (Answer should be...

Homework Statement A space capsule, which may be treated as a sphere of radius 10m, is hit by a micrometeorite which makes a hole of diameter 2mm in its skin. Estimate how long it will take for the air pressure to drop by 30%. Avogadro's number is about 6 \times 10^{23} Homework Equations...

Homework Statement I have designed an egg drop project that performs just as I had hoped and portected the egg perfectly. I would need to make the object as stable as possible while it is falling. My container is the foam molds that held the screen for my computer. The structure of the foam...

My textbook says that electrons in a wire begin with electric potential energy- they are then accelerated by the electric field and their potential is converted to kinetic. Once inside a resistor, they collide with molecules and their kinetic energy is converted to thermal energy. However, it...

[FONT="Garamond"]Homework Statement So, as you all know, everyone has to do an egg drop project sometime. Well, I got mine today. Yes, I know there are other similar topics, but they all the ones I found had a bunch of restrictions that didn't apply. Rules: -Any materials may be used -no kits...

When designing an orifice plate to reduce the pressure of a constant flowing liquid, is it best to have one large hole in the center or multiple smaller holes? One example: Pipe diameter = 10 inches, Flow = 2800 gpm water, pressure drop = 150 psi, temperature = 115 F. The hole diameter...

Okay so we are going to drop an egg from three stories high. The only materials we are allowed to use is popsicle sticks, glue, string, and garbage bags...HELP!

Homework Statement Homework Equations V=IR (Ohm's Law) The Attempt at a Solution Now I'm able to get V=0 for when R=0 but I'm not sure as to how to solve for I when R=0. Can I ignore the 10 Ohm resistor as it's a short circuit as R=0.

Homework Statement in a Millikan oil drop experiment, a uniform electric filed of 1.92 x 10^5 N/C is maintained in a region between two plates separated by 1.5 cm. Find the potential difference between the plates. Homework Equations mg = q x E The Attempt at a Solution in order to...

Consider this circuit with R1 = 30 ohm, R2 = 10 ohm, R3 = 10 ohm, R4 = 20 ohm, R5 = 60 ohm. (the circuit is attached) A. What is the current across the resistor R2, if a voltage of 110 Volt is applied to the two terminals at the bottom of the figure? B. What is the voltage drop across R2...

Hello! Ive been trying to understand mechanisms of blood pressure and so far the more I read the more confusing it gets. What I really don't understand is this - why does the pressure drop is largest in arterioles? The physiology book I use says that they constitute a high resistance and as...

Is it posible to make a telescope using water drops? (water drops are to be on transparent plastic or glass, set at desired distance; convex lense is a free drop, concave is a water drop in a ring (because of surface tension))

Drop chance probability http://www.wow.com/2010/01/13/drop-chance-probability/ For some reason, the explanation provided in that document is not clear to me. Could anyone offer a different explanation?

I'm having trouble understanding expansion valves. Gas leaving a diffuser increases its pressure as the cross-section increases (i.e as the gas expands), like in a compressor. We convert kinetic energy in potential energy. That I understand. But in a expansion valve, pressure drops as the...

At what speed (flow/volume for that matter) does air leave an outlet when you know it holds x bars in the pipe? (It goes from x to zero (or athmospheric) -- you know the pressure difference) I assume you can neglect relative roughness, resistance, and so on as the pressure drop is over...

Hi, I want to know how high the flow rate trough a pipe is (outlet), but I only now the pressure difference (0.7MPa or 7 bar), and the diameter of the pipe. At what speed (or for that matter volume) does air leave a pipe when the pressure difference is 7 bar, and the diameter is 25.4mm...

Just curious: is the voltage drop across a load an expression of how much energy that device uses? If it is, what is the difference between voltage drop and power? Power is also used to determine the energy usage of a device, right? These aren't very important questions. I've just been...

Fluid Problems :( 1. Water is running out of a faucet, falling straight down, with an initial speed of 0.500 m/s. At what distance below the faucet is the radius of the stream reduced to one-half its value at the faucet? I tried doing this by using Bernoullis equation and replacing r with...

I have a number of difficult questions regarding this topic! 1. How to find the coeffients of the Liquid Drop model? I have a table of atoms with their masses, and total binding energies. Do I just fit the curve of the B/A vs A to get the coefficients? 2. In a Liquid Drop model, what...

Please see here: http://www.youtube.com/watch?v=n5bsQ_YDYCI&feature=player_embedded# First - wow. Second - I'm not sure I understand the mathematician's explanation. Why would there be a thin layer of air to begin with? Is this correct? Is there a different explanation for this...

The egg drop rules are that the container must be less than 1600 cm cubed in volume, wiht no dimension greater than 25 cm and a maximum mass of 1 kg. The eggs must be able to be easily removed after the drop from 2.5 meters. Parachutes may not be used and the device must be in one piece. Three...

I want to have an easier semester and I'm thinking about dropping either Globalization or Philosophy and Social Ethics. Which of these classes is usually harder? I know this may vary by professor and the university but in general which of these subjects is more difficult? Based off the...

Oil drop weighs 5.8 x 10^(-15)N. It is suspended in a uniform field produced by a pf of 363V between 2 parallel plates 6cm apart. 1. Calculate charge on drop. 2. How many excess electrons does it carry? My question is, why are the electrons excess? The answer is 6, which is basically the...

Homework Statement My physics teacher is making us do an egg drop after only being in school for two weeks. We can only use up to four 8.5" x 11" sheets of regular computer paper and as much tape as we want. The tape cannot be used as more than a form of attachment. Meaning that the tape...

Homework Statement In Fig. 28-5a calculate the potential difference across R2, assuming = 14 V, R1 = 6.0 , R2 = 3.0 , and R3 = 2.0. (image isn't working online, but it's a simple circuit- all the resistors are in series) Homework Equations V = IR The Attempt at a Solution Req...

Car A is dropped at 4000 ft where directly below is an x on the road. At the instant Car A is dropped Car B is exactly 4000 ft from the x driving down the road at a constant velocity of 142 mph. Does Car B make it past the x in time to avoid disaster? It's such a simple kinematics problem...

Does anybody happen to know what it is, or how to find out the voltage drop of a particular transistor?

Hi, Which equation should i be using to find the pressure drop across a channel. I know the length of the channel, the hydraulic diameter and the reynolds' number. Thank you

Dear All, I’m facing some problem when I try to determine the total voltage drop (%) from the source to the load. Assume the condition as follow: 1. DB-A is serving 3 number of individual load (#1,#2 and #3) , each 100m away from DB-A, single phase, 5kw, pf=0.85, V=240V,by using...

Hi guys, i want to ask why is there pressure drop across valves? Because if you look at bernoulli's equation, the head will be the same in 3 points, before the valve, at the valve and after the valve. The only thing changes when a fluid flow through a valve is its pressure and velocity at the...

22 Dec 2009 21:16 Voltage drop question Hi All; Total noob, first post:smile: I'm working on a small robotics project. I have an embedded computer (5V) and 2 motors with a controller. It's all powered from a 4.8V NIMH battery. The problem I'm having; As the battery gets...

Im working on a project that involves me making a electrical circuit that will supply initially around .52 amps of current for and then drop the current to at least .40 amps of current to a actuating wire that uses current to cause wire to contract. The way i have my circuit made is that i have...

Homework Statement Prove that for a line having resistance R, and reactance X, and supplying load of P+jQ has an approximate voltage drop of: Vr = [RP+XQ]/Vs Homework Equations none given. The Attempt at a Solution I made a diagram, with R, X, and P+jQ in series. Vr is the...

Is voltage the potential energy difference between source A and B in a circuit? If so in absense of resistance and the presence of a 3V battery does point A have 3V to begin with and at point B there is 0 volts. Is all potential energy converted to kinetic energy when moving from A to B? A is...

the depletion region is resposible for voltage drop all that is fine but in forward bias there is no depletion region hence there can be no voltage drop but it is mentioned in my book that the voltage will drop by .7 volt how come this can happen also i have many doubts in transistor...

Homework Statement A spherical drop of oil, 1 mm in diameter, falls on a water surface. The oil spreads out to cover a circular patch of diameter 60 cm. The oil spreads out until it forms a uniform layer on top of the water, only one molecule thick. What is the thickness of this layer...

Hi Experts :!), I tried to use a 5v dc voltage source to power a normal handheld 3v radio using a resistor to regulate the voltage. The voltage drop across the resistor seems to fluctuate constantly by about +/- 0.8 volts. So, the voltage drop across the resistor fluctuates between 1.5v...

I recently made a small version of Lord Kelvin's "thunderstorm" while I was bored at school one day, and I'm still mystified as to how such a large potential gets generated. I have two hypotheses, but I haven't had a chance to test them yet and I was wondering if anybody knew how the generator...

Dear all, I am trying to solve a simple model with Comsol to find the pressure drop in a rectangular channel W=5mm, h=0.6mm, L=10mm. When i try to set the inlet velocity to 0.5m/s the solver shows the error message "Maximum number of Newton iterations reached". The solver works fine if i set...

Homework Statement For my Calc based Physics class we will be given an egg, a required height and a bungee cord (non-linear). We're to have already come up with a formula for this bungee cord to compute the required length so that we'll be able to drop the egg from the height and come as close...

What is better to possibly get a C in a class or just drop it and retake it after I transfer somewhere else? I have a really bad Linear Algebra course that is taught by an inept instructor who is well "past his prime." Complemented with a very obscure and difficult to understand book. I've...