Drop Definition and 835 Threads

Say we have a rectangular wire frame about 7 inches in size, see: http://www.schillereng.com/EggDrop1.jpg Let an egg of mass m, say 40g, be suspended in some type of "seat" as in the above jpg. with rubber bands going from the the eight corners of the frame to the egg seat. Let us say the...

Voltage drop is how much energy a device uses. Wattage is the rate of energy transferred into the device per unit of time. Aren't both essentially the same thing? Or am I just confused?

Homework Statement A Ball is dropped onto a step at point A and rebounds with a velocity Vo at an angle 15 degrees with the vertical. Determine the value of V0 knowing that just before the ball bounces at Point B its velocity VB forms an angle of 12 degrees with the vertical. Homework...

Homework Statement A ranch hand sitting on a tree limb wishes to drop vertically onto a horse galloping under the tree at the speed of 9.28 m/s and the distance from the limb to the saddle is 3.84m. a) What must be the horizontal distance (m) between the saddle and the limb when the ranch...

Homework Statement I have a couple of questions about one of my homework assignments any help would be greatly appreciated. 1. How do you find the Voltage drop of a Resistor in an AC Circuit is it similar to DC? V=IR The Resitor value is 68 ohms and there is an 80mH inductor in front of...

A Major league pitcher can throw a ball in excess of 41.3m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches a catcher who is 17.0m away from the point of release? So Ay=-9.8 X=17m t=? Vox=0 V=41.3 y=(Vy^2-Voy^2)2g I thoguht i would use this...

Hi guys I am currently using Comsol to model a single rectangular channel, a typical one found in a fuel cell (with symmetry boundary). Dimension of the inlet and outlet area is of the order 10e-3 and the length of the pipe is 0.1 m. I am having difficulty getting the expected result. The...

Basically I am taking the lab concurrently with the class, unfortunately we learn how to do the lab a few weeks after we do it so its becoming quite depressing. I could probably slide out of it with a B or C and get absolutely nothing out of it. I should have waited to take it butI didnt realize...

Hi, 20m straight length horizontal pipe (60 mm internal diameter), steam flows at rate 0.5 kg/s, at midpoint there is a valve in the line. inlet pressure to this section of line is 5 bar (gauge), pressure at end of line is 3 bar (gauge). mass quality of steam is 0.8 and 2 phase flow occurs in...

Homework Statement Solve for all unkown i's and V's EDIT: there is a seventh resistor that is right under the negative side of the source. Vs=12V Homework Equations V=IR The Attempt at a Solution I got the I's by finding the voltage across the entire 2 loops to equal 0, then...

Homework Statement Determine Req, the missing I's and V's? Homework Equations V=IR The Attempt at a Solution First problem is that I thought I learned that R2 and R3 are in parallel so you have to use the recipercal rule, but looking back at my notes for Interpetation...

Homework Statement A small drop of water measuring 0.6 mm in diameter, hangs suspended above the ground due to the Electric field of the Earth (140 N/C). How many extra electrons are on the drop of water? Homework Equations i know k=8.99 x 10^9 abs(f)=K((q)/(r^2)) The Attempt at a...

As my name indicates, I enjoy archery (specifically bowhunting). I am in the process of determining the ideal weight (measured in grains) for a set of arrows that I am making. I want to have the heaviest arrow possible (i.e. for optimal momentum and penetration), but I want to still have...

Homework Statement We all know the egg drop, and I am stuck as to what to do with the extreme little amount of materials we are allowed to use. Here they are: 1 regular supermarket egg 5 sheets of printer paper 1m of scotch tape We are to drop it once from the ceiling of our...

Hi I am designing a heat exchanger. I know the mass flow rate required for cooling. I have calculated the pressure drop for current design. How do I work out if the size if the heat exchanger can handle the flow rate ? Does the mass flow rate depend on the size of the heat exchanger tubes ...

Someone on YoutTube stated... Each magnetic pole drops off by 1/R^2. Once you get away from both poles (Cavendish setup) they they start canceling each other out and it ends up as 1/R^3. Comments? Here's the link if you need backup info...

Hello, We did a lab in class yesterday and we are expected to write a report and graph our results. The lab was a simulation of the Millikan oil drop experiment. We used graphing calculators to do the simulation and took down 15 results. One thing i don't understand is how to come up with the...

I was bored, my internet was out (from the rain), and so was TV. So all I could was sit there and think... So I started asking myself, how much energy does a single rain drop have and how much electricity could THEORETICALLY (100% efficiency) be produced from falling rain? So when my internet...

There are situations when a water drop falls on a really hot metal surface and, instead of evaporating, it kinda bounces on the surface. Why?

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...

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%...