Drop Definition and 835 Threads

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...

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...

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...

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...

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...