Drop Definition and 876 Threads

I have a packed bed with an inlet pressure of 108psig and an outlet pressure of 88psig to give a total pressure drop of 20psi. The packing is becoming damaged due to the 20psi pressure drop. I have thought and looked for an answer for a long while, why does the packing only experience the...

Hello all, I have some performance data on a particular radiator, and I want to model the system and see if I can't get a simple analytical model to match the data. The problem I'm having is with the air flow rate through the radiator. The only relevant data made available to me is the...

I have a centrifugal pump that gives flow of 56 lit/min at 50 psi. Media: clear water, Temp. ambt The discharge pipe size: 1 1/2", Material: SS Total pipe length: 14 feet At 3 feet from pump discharge there is 90 degree bend and again at 6feet there is 90 degree bend. My question is what...

1. What would happen if you drill a hole that ran from the North pole to the South pole and then drop a bowling ball into the hole? 2. If you fire one bullet straight up (90 degrees from horizon) and one bullet at 45 degrees angle to the horizon which one hits the ground first? 3. If you spin...

Homework Statement Hi everyone. Hope I'm not breaking any forum rules, because I've alread wrote this one in another thread by mistake. Here is where it should be. Two balls of different mass are dropped one in top of the other, with the light one on top. After they collide with the floor...

OKay, i have to do the egg drop for class and I can't think of any ideas. All my trys have failed and the parameters are killing me. It has to be: -made up of 100% biodegradable products. No plastics, metals, rubber, sponges, real sponges, not even biodegradable styrofoam. Basically I can...

I'm having a problem with this problem: Two balls of different mass are dropped one in top of the other, more precisely the one with the smaller mass on top. How can i figure out the velocity of both balls after the collision with the ground? I know this is a very trivial linear momentum...

Hi, For my physics class I have to design some sort of encasement around an egg so that it will survive a 3m drop. The encasement (including the egg) can be no larger than 150 cubic centimeters. Any ideas? Thank you

Egg Drop Design Help! 1. Ok, I need some ideas for an egg drop project in my class. A. Dropping from 7 Ft, then 12 Ft, and then 25 Ft... Consecutively. B. Can't be more then a Meter in height. C. Allowed to use the following: 1. 15 Popsicle Sticks 2. 15 Straws...

Homework Statement An oil drop with a mass of 7.20*10^-16kg moves upward at a constant speed of 2.50 m/s between two horizontal, parallel plates. If the electric field strength between these plates is 2.20*10^4 V/m, what is the magnitude of the charge on the oil drop? Homework Equations...

My own weird idea I thought of about a year ago. Be interested to see the answers... A longish strong pole (about 2 metres) could theoretically save a life if someone used it when jumping from a cliff edge. It would be used just before they hit the ground to decelerate themseves more gently...

Info coming soon, have to go to lunch. ----- Materials we are Given: Raw Egg 2 Full Sheets of Newspaper 2 Rubber Bands 6 Toothpicks Glue (Unlimited) ----- You can only use materials from parts department. Materials cannot be returned. You must eb able to take capsule apart during...

This is not homework, I'm just curious. Perhaps it belongs in the Engineering Forum, but the last one of these I posted there just got left in the dust. I have a rather specific question to ask those of you who are familiar with paper airplane building/structure/dynamics. How would I go about...

Hello, I am wondering how to determine the pressure drop due to fittings such as Tees and "Y's" when there are two flows coming in and one coming out. So for example there is a Tee where there are two flows coming in opposite directions (180 degrees from one another) and they combine and exit...

Looking at the liquid drop model of the nucleus and the semi-empirical formula for the atomic mass of the nucleus. I understand the formula but I'm trying to figure out why some nuclei are unstable against both beta- and beta+ decay. Any ideas? I assume it's something to do with the...

Homework Statement A 10 μF capacitor and a 25 H inductor are connected in series with a 60 Hz source whose rms output is 112 V. Find the voltage drop across the inductor. Answer in units of V. Note: Sigfigs do not matter Homework Equations I = V/Z where Z is the impedence XL =...

Homework Statement A power station delivers 440 kW of power through 3 ohm lines. How much power is wasted if it is delievered at 12000v? Homework Equations v=IR P=I^2R P=IV The Attempt at a Solution I believe you are supposed to solve it like this but I do not understand why...

Hey guys I am completely new to this site and electronics so forgive me. I've uploaded a photo of the question. I am trying to work out at what values does just D1 conduct D1 and D2 conduct then finally all of them. Im really stuck here. i know that the diodes start conducting when the...

Hi guys, I have a very simple question but which is messing with my mind. I'm trying to figure out the voltage drop across a diode when it is reverse biased, and I'm just not getting anywhere. Can someone please take a look at the attached image and explain to me what the voltage drop across...

I need ideas to build a design that will prevent an egg from cracking or breaking. Guidelines: Design has to have a mass of <300g. Must fit into a Sterillite Plastic box Cannot simply be wraped in something (i.e. a pillow, bubble wrap, t-shirts) Cannot reduce velocity (wings...

We know that free fall acceleration is independent of mass. 9.8 m/s^2 on the Earth Surface and 1.63 m/s^2 on the Surface of the Moon. But what would happen if you dropped the Moon on the Earth or, the other way around, dropped the Earth on the Moon? Which acceleration would it be? Is...

Compute the voltage drop along a 25 m length of household no. 14 copper wire (used in 15A circuits). The wire has diameter 1.628 mm and carries a 15 A current. Vdrop=I*R R=rho(L/A) I just plugged the resistivity of copper wire which is 1.72*10^-8, length, and area into find the...

The batteries in this cicuit create a total voltage difference of 6 volts across the circuit. Assume A is 6 vols in each circuit, Record the voltage of the lettered locations at the time when the circuit is first connected, and later when it is fully charged Note: bulbs below are identical...

Homework Statement a ride at a them park is a vertically ascending/decending ride. The total mass of the 10 person carriage is 750kg (people included). the ride rises up to the top of the ride until stationary waits for 2 seconds and then drops at a rate of 10ms-2 for 3.5m. when near the...

i'm in my 4th year in college, double majoring in physics and applied math. I'm looking for applied math or mechanical engineering for grad school, probably computational fluid dynamics or heat transfer for ME i haven't taken any ME classes, all the ME profs I asked to help research with...

I've been assigned the infamous egg drop project, and have been brainstorming as many ideas as possible. However, I have many restrictions, and the one I am having the most trouble with is size. My container cannot be any larger than 4"x4"x6", though it must protect the egg from a fall of...

Our instructor has given us the task of coming up with a container to drop an egg from a distance of 30' and not break. Container can't be any larger than 12"x12"x12" and no parachutes or anything that will affect fall/normal gravity. Egg must remain accesible to verify that it hasn't broken. No...

i'm currently a physics and applied math double major, looking at mechanical/aerospace engineering after graduation (i'm in my 4th yr but will stay for 5th) i'm taking my 1st engineering class ever this semester, which is Feedback and controls since i heard it would be a good class for me to...

Short Version: I goofed up and received an F on the first calc III midterm. It looks like the max I can get in the Class is a C. That wouldn't be a problem except for I already have 2 other C's. Long Version: I am a sophomore in engineering physics, looking to go into nuclear engineering in...

I'm not understanding something very basic here. I know what voltage drop is. At least I thought I did. Here is a question: Assume you have a power supply in a control panel of a building. 500 feet away is the load device. When doing voltage drop calculations for the wire (500 feet...

Homework Statement The left plate of a parallel plate capacitor carries a positive charge Q, and the right plate carries a negative charge -Q. The magnitude of the electric field between the plates is 100 kV/m. The plates each have an area of 2 × 10-3 m2, and the spacing between the plates...

Homework Statement The terminal velocity of a 3×10−5kg raindrop is about 5m/s . Assuming a drag force , and Drag Force = -bv 1. Assuming a drag force determine the value of the constant . 2. Assuming a drag force determine the time required for such a drop, starting from rest, to reach 63%...

Hi all, I have a heat transfer problem. In this problem, a water drop (assume sphere) is falling from a very high building. The outside temperature is below zero say -20 degree centigrade. How much time will it take to freeze? I am not able to understand how to model this problem. Which...

I need to determine if a valve can handle a flow rate of 50 GPM, this valve being: 2/2 Way, Normally closed, w/ 2-pilot control, and coupled solenoid. I also need to determine pressure drop... it is a burkhert model - 457361D the valve specs indicate: Cv = 35.1 pressure...

Homework Statement Next lesson, I am doing a water drop experiment. The basic idea is that a drop of liquid food colouring will be dropped from an eye dropper at different heights. The diameter of the wet mark that is left is then recorded for all these heights. I imagine I'll then plot a...

I have a problem when calculating the temperature drop after a pressure release in a water sample. I use the following expression for the adiabatic temperature change: (delta T/delta P)= alpha*T*V/Cp where alpha is the thermal expansion coefficient, T is the temperature in Kelvin, V is the...

Researchers have found that cell phone signals can alter four essential features of fertile, grade A sperm: 1. Mobility -- How well they move; 2. Viability -- How tough they are; 3. Sperm count -- How many there are; 4. Morphology -- Proper composition. In men who use cell phones, multiple...

Credit: Wattsupwiththat.com http://wattsupwiththat.com/2008/12/16/Earth's-magnetic-field-has-massive-breach-scientists-baffled/" It seems the magnetic field is weakening, perhaps getting ready for a polar switch, my hypothesis is that the weakening magnetic field is allowing excessive...

1. To determine how high a cliff is, a llama farmer drops a rock, and then 0.800 s later, throws another rock straight down at a velocity of −10.0 m/s. Both rocks land at the same time. How high is the cliff? 2. I know some kinematics equations must be used 3. I am stumped...

Im doing Final exam review this is the first question please check! Thank you! Homework Statement 1. Water balloon drop. You and your physics major roommate devise a plan to drop water balloons on classmates entering your dorm. Just as they cross a mark that’s 3.0 m from the door, you’ll...

[b]1. 2) A tennis ball starts from rest rolls down a hill and at the end of the hill becomes airborne. (diagram) Find the horizontal range that the ball drops in. [b]2. d=v(2h/g)^.5 [b]3. How do you go about solving this problem?

I would like the formula that describes the reduction in pressure that results when a constant flow (cfm) of compressed air travels from a 3" diameter pipe through a bell reducer that provides a smooth transition to a 1.5" diameter pipe. Also, in the same piping configuration as described...

Ball Drop Impact test - equations?? I'm hoping someone can point me in the right direction here. =) I'm testing a bunch of materials by dropping a steel ball from increasing heights until the materials break. So I have a bunch of data that looks like this: Material A - broke at 18cm...

Homework Statement The rate of evaporation of a spherical drop of liquid is proportional to its surface area. Derive R(t) assuming constant density, where R(t) is the radius of the drop as a function of time. Homework Equations I know that the surface area of the sphere is A = 4 \pi...

Homework Statement Does the photocurrent drop to zero when a potential across it is equal to the kinetic energy of electrons?, because i found this not to be the case, the photocurrent reached a steady value that didnt decrease further, as i increased the potential across the anode and...

So in projectile motion, an object launched horizontally traveling over a certain displacement (Δx), fall time remains constant regardless of what this horizontal velocity was. I understand that in this equation: Δx = v(avg) × Δt as horizontal velocity increases, displacement also...

A friend and I recently read this article in Scientific American: http://www.sciam.com/article.cfm?id=new-quantum-weirdness Now, it seems that this allegedly "new" quantum weirdness/anti-tunneling is nothing more than what you learn in your first semester of undergraduate quantum, i.e. the...

Homework Statement If the charge to mass ratio of a particle, e/m, is known derive a formula to find m, and then by proxy e. Drops of oil are allowed to drop down through a potential difference. With the electric field you can keep a particle suspended for however long you need, droping...

Hi I am trying to find at what hight i need to drop a egg from 2-6 meters. We will start with 2 meters. The weight of the egg and device holding the egg is .11kg together. I no the formulas for EPE and EP " EPE=1/2KX^2 AND PE=mgh. The question is now how to find where on the elastic band to...

Hi I am trying to find at what hight i need to drop a egg from 2-6 meters. We will start with 2 meters. The weight of the egg and device holding the egg is .11kg together. I no the formulas for EPE and EP " EPE=1/2KX^2 AND PE=mgh. The question is now how to find where on the elastic band to...