Drop Definition and 876 Threads

My physics class is doing the popular egg drop experiment. We may only use wooden strips no larger than a 1/4" by 1/4" in cross section (ex: toothpicks, popsicle sticks). We may not use bamboo as it is a grass not a wood. We can only use glue, cement, superglue, or hot glue to hold it...

I have a fixed object of known mass (12kg) being impacted by an air pistion of known force (), I desperatly need to be able to calculate what height an object would have to be dropped to have the same force imparted to it that a specific known piston would. what equations do i use and what...

How did he determine the mass of an oil drop and the charge of the electron?

Homework Statement You drop a stone from rest into a well that is 7.35 m deep. How long does it take before you hear the splash? d=7.35 m v=343 m/s (because the disturbance is air molecules and the medium is air not water) Homework Equations d=\dfrac{1}{2}gt_{1}^{2} \lambda=4d and v=\lambda...

I have an egg drop project, in which we make a container on the ground that can cushion the fall of the egg. The limits are: 8 cm height max, and 45 x 45 cm box max area and the egg must not break even if it bounces out after hitting the container. It'll be dropped first from a height of 2...

Homework Statement A 1.50x10-14 kg oil drop accelerates downwards at a rate of 1.80 m/s2 when placed between two horizontal plates that are 9.40 cm apart. The potential difference between the two plates is 980 V. Determine the magnitude of the charge on the oil drop. Homework Equations...

I have to design an egg drop experiment for a teaching project. I'll describe the project and how everything works, then the students have about half an hour to create a container to shelter the egg so that it doesn't break from a fall of about 20 feet. The sticking point is the time limit. I...

Hi, I'm prototyping a non electrical refrigeration system and need some help with a calculation. I have a 2 litre bottle. I pump in air until the internal pressure is 5 bar. I allow the heat increase to dissipate back to the ambient 20 C. I release the air. What will the temperature of...

I was taking with my dad and we got on the subject of what would happen if you dropped a spring into the ocean. Well, I said nothing it would sink to the bottom and not compress because pressure is pushing on it equally from all directions. He agreed. Then I said what would happen if you...

Hello Ok, there's been another news in my area that a young woman was drying her hair, while she was in bath. Smart, huh. And the dryer fell out of her hands, and now she's dead. My kids hear those news and they're shocked and all, but I'd like to explain my kids what actually happened...

Hi I working on a 2 cell lipo pack and need to drop the volts from 8.4 to under 6 volts. I have been using diode to do this but now I need to know what amps it will handle and which diodes to use. the setup I have now runs one servo that might pull 0.25 amps but now going to a system that will...

Homework Statement an oil drop carries six electronic charges, has a mass of 1.6 x 10^-12 g, has a mass of 1.6 X10^-12g, and falls with a terminal velocity in air. what magnitude of vertical electric field is required to make the drop move upward with the same speed as it was formerly moving...

Homework Statement Hello! I'm looking at a situation where there is a finite potential Vo for x<0, but zero potential for x>0. For a particle moving from left to right, I'm wondering what coefficients for the solution to the Schrodinger equation are equal to zero, and also how to prove that...

Homework Statement I'm doing Millikan's oil drop experiment in a lab. I've got a set of measurements and all that, but in analysis of the data I can't seem to get values for the charges on individual drops that seem reasonable. I find that each drop is carrying between 10 and 300 elementary...

Homework Statement In my honours lab we are performing the Milikin drop experiment, and we've come into a slight problem, where when calculating the radius of the drops and the charge on the drops, the charge seems to vary with change in E-field. When performing the experiment we first...

Homework Statement An ice cube, weighing 100g, is dropped in 1kg of water at 20 degrees C. Does the ice melt? If not, how much remains? What is the final temperature? The latent heat of fusion of ice at 0C is 6.025 kJ/mol, and the molar heat capacity of water is 75.3 J/K mol Homework...

This is not a homework question. Why is the voltage drop on an inductor opposite the electron flow? "When the current through an inductor is increased, it drops a voltage opposing the direction of electron flow, acting as a power load. In this condition the inductor is said to be charging...

So the voltage drops across closed circuits I get that is P = V^2/R to get the power and then you will use P=I^2/R to get the current running through the circuit and in the case the current flowing through the closed circuit is equal in every resistor and so is the voltage drop. The part that I...

Egg Drop Project Help! I have to make a egg drop from approximately 25 meters. The egg has to be directly covered by: 1 latex glove 3 pieces of newspaper 2 rubber bands 1 piece of string (30cm) 1 zip lock bag 12 inches masking tape 100 tooth picks glue only to connect bits and pieces...

Homework Statement Revered members, Kindly see my attachment. Homework Equations The Attempt at a Solution When the charged oil drop is balanced, electric force = weight of oil drop. Eq = mg Eq = F + U, where F is the viscous force and U is the upthrust force. Since the oil...

Hi, I need to perform drop test of a product, whose mass varies from top to bottom, when i drop it from 8ft high, Whether the orientation of dropping point and destination point (where it hits the ground) varies according to the mass

I have a circuit with 3 meshes for which I have to find the mesh currents, and I have. However, I just thought that there might be a voltage drop over the dependent current source in the circuit, which would change the mesh current equations. The CCCS is shared by two meshes. When I did the...

Homework Statement A ball is dropped from the roof of a building. An observer looking outside the window sees the ball just outside. If the window is 3.99 m tall and the ball is in view for 0.897 s, how far below the roof is the bottom of the window? Homework Equations "Kinematics...

Homework Statement You drop a tennis ball from 4.36 m. It rebounds to height of 2.45m. If the ball is in contact with the floor for 10.0 ms, what is its average acceleration during that contact? Homework Equations we know initial height to be 4.36 m acceleration due to gravity to be...

Homework Statement While a person breathes in, a typical alveolus expands from a radius of 0.13 x 10-3m to 0.15 x 10-3m. The alveolus behaves as though it has a single surface which is described by P =2γ/r ote the following. The gauge pressure in the alveoli of the lung is denoted Palv...

PLease ask me questions if I am unclear. So here goes. It was a few months ago I asked this, I am taking an analysis course that basically is killing me. Months and months ago, just before the spring term ended (near the end of April), I asked the professor who was teaching the course...

i have problem to conceptualize this old galvanometer readings for voltage drop. i plot a diagram of circuit of interest for bether explanation of what's bothering me. so, in DC circuit with some resistor in series, electric current is constant and is of some known value. and if i want to use...

I finished my undergrad last year and joined this phd program in fall. I passed the qualifiers in December, and over the two semesters, I have completed all the necessary phd courses, taking no master's courses. Early in the year, I was contacted by a Professor in hep-exp to try out his group...

my teacher said he will just drop from the spot he jumpe up from, not continue moving in the direction of the plane for a while. Is this the same when i drop a object i am holding out of the car window in a moving car?

Hi. I'm hoping someone can help me out with a pretty simple physics question. My electrical circuit skills are pretty rusty, so please bear with me. I'm using a 19V DC laptop adapter to power a 12V DC pump motor. The pump is rated for 3.5A. I have an on/off switch between the power supply...

Here is a question for the physics experts. Some people been debating about the impact force on a bike of a bike rider riding off a 6 foot drop to a flat landing. Mainly the debate is about if speed would lessen the impact force on the bike because of the impact angle. So, if a bike rider...

the atomic nucleus mass is given by but why is it a minus away of binding energy / c2 = mass of the empty parts of the nucleus? shouldn't it be a plus? mass of nucleus = proton mass + neutron mass + mass of empty parts of the nucleus?

Hi i want to calculate the concentrated pressure drop in a tube having 90 round bend and other one having 180 round bend. The equation that i know is: dP (concentrated) = 1/2 * b*r*v^2 where: b=specific coefficient for concentrated pressure drop r = liquid density (kg/m³) v = average...

When we take down voltmeter readings from the terminals of a Rectifier (rated 12V), we get the voltmeter reading as 4.5V. Does that mean the rest of the voltage is lost in the form of voltage drop? or is it because of the current drawn by the load? I would be glad if someone could please post...

Hi, I'll make a valve open and close for some degrees that I have to calculate, the valve motion will produce a pressure wave in the pipeline. I have to know how many degraus I must open the valve to produce a pressure drop that I want. Someone know how I can calculate it? Is there an equation...

Homework Statement Two resistors, R1 and R2, are connected in series across a potential difference, ΔV0. Express the potential drop across each resistor individually, in terms of these quantities. The Attempt at a Solution R1 + R2 = Req I = V0 / Req drop at V1 = V0 / (req) * R1 V2...

I am so tired I tried many times to calculate the pressure drop profile. What is the right equation? Please help me

Hello everyone. I have natural gas (methane) flowing through some piping, and the last little part of pipe is where I'm concerned. The gas goes through a drawn aluminum tube, about 5.08 mm ID (it's a very small tube). The tube has three 90 degree bends where it ejects out of an orifice. It...

Homework Statement A staircase contains three steps each of 10 cm high and 20cm wide(refer attachment).What should be the minimum horizontal velocity if a ball rolling off the uppermost plane so as to hit directly the lowest plane? Homework Equations s= u*t + 1/2 a*t^2 The...

just a question on our test today. what's the right answer? a) the mass to charge ratio of an electron is very small. b) the speed of electrons is very great c) the electron has a negative charge d) the proton has a negative charge e) there exists a smallest fundamental negative charge...

I am needing a project to withstand the impact of a 15lb wood 2x4 traveling at 67mph in a horizontal fashion. I want to test my project before the final test. I want to vertically drop a 15lb wood 2x4 fixed to additional weight at a height of 10ft. The additional weight will be released just...

Homework Statement 1. the average velocity of the air to meet the required volume flow rate, 2. the pressure a fan needs to produce to overcome the frictional losses in the duct, 2. Relevant Information Duct size - 600 mm x 600 mm which operates at 3 Pa/m. The air path is 87 meters from...

Peter Thiel's "20 Under 20" Announced - will pay these 20 students to drop out http://thielfoundation.org/index.php?option=com_content&view=article&id=26&Itemid=19 Interesting. twofish-quant might like this. I wonder how they'll fare if they later decide to return and apply to grad school.

Let's say I have a container and it has an opening. I drop it into the ocean and let it sink to the bottom of the deepest part about 36k feet down. Now it's at the bottom and full of water and I seal it then I bring it back to the surface. If I open it will it decompress pretty violently since...

Dears, I am going to find out the required pressure for the air to pass through a bed of stone in a cooling tower. I have read the book: Handbook of pneumatic conveying engineering (by David Mills) and it said that it can be determined by permeability of the stones (15-20mm size). The...

I have a general sort of structural question. I have been reading a lot of maths papers lately, and it seems there are some isomorphisms that people omit from their calculations. For example, in a category with a terminal object, 1, A \cong A \times 1 where the isomorphism is given from left...

For pressure drop of PWR, what is the plenum to plenum pressure drop?

Resistor Capacitance Circuits.Say there is a resistor before a capacitor connected in a wired circuit; and there is a battery as the emf source (10V for example). How can the capacitor be charged to approx. the voltage of the battery if the voltage drop across the resistor = the voltage of...

I have written this problem myself to present to my professor. He teaches HVAC and Electrical for the department of Construction Management. Some of the problems and solutions we do in class are inconsistent with the material I was taught in physics. He really appreciates my criticism and I...

My textbook tells me that the voltage in an electric circuit only drops across a resistor. I don't quite understand this; doesn't this suggest that the electrons in the current are moving at a constant velocity? I would think that, since they are moving under the influence of an electrostatic...