Drop Definition and 835 Threads

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...

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...

[FONT="Arial Black"][FONT="Arial"][SIZE="5"] Question In flow over a flat plate, how to calculate pressure drop by knowing displacement thickness values at 2 points. Free stream velocity is known.

There is a spaceship in low-earth orbit, at 2000km above the surface of the earth. There are two balls in the spaceship that are dropped. The balls are 1m apart. How long will it take for their separation to increase to 1.01m? Assume that one ball is at 2000km, and the other is at 2000km+1m...

I have a 45kW VSD drive with pf of .9 and FL amp of 75A, I have a 350m run from the MCC to the VSD itself and I'm trying to calculate what size cable I need so that I don't exceed the specified voltage drop of 3%. The line-line voltage where the motor is to be placed is 400V and the cable...

800 kg roller coaster is initially at the top of a rise, at point A. It then moves 125 ft (38.1 m), at an angle of 40.0° below the horizontal, to a lower point, B. (a) Choose point B to be the zero level for gravitational potential energy. Find the potential energy of the roller coaster-Earth...

Homework Statement A 0.5 kg tennis ball is dropped from rest at a height of 5.6 m onto a hard floor. A flash photograph shows that the ball is compressed a maximum of 0.6 cm when it strikes the floor. b) Assuming that the acceleration of the ball is constant during its contact with the...

Homework Statement A 0.5 kg tennis ball is dropped from rest at a height of 5.6 m onto a hard floor. Homework Equations a) What is the speed of the ball at the instant of contact with the floor? v = m/s The Attempt at a Solution I need acceleration and I have attempted using...

Right now I have the following on my plate: 3 credits of Senior Lab (condensed matter) 3 credits of Solid State lecture 5 credits of EE Circuits Lab (diodes and transistors are the main topic) 3 credits of Independent Research for a professor Study for GREs Nov. 8th Each of it (except...

What are the variables that determine the maximum diameter of a drop of liquid that will not disintegrate while falling through a gas (e.g. raindrop falling in air)?

Homework Statement A ball of mass 0.35 kilograms is currently 1.1 meters off the floor and has a speed of 1.3 meters per second straight up. Assuming no energy is converted by air friction, how high will the ball go? Homework Equations PE=mgh KE=1/2mv^2 The Attempt at a Solution...

Homework Statement While riding on an elevator descending with a constant speed of 3.3 m/s, you accidentally drop a book from under your arm. (a) How long does it take for the book to reach the elevator floor, 1.1 m below your arm? s (b) What is the book's speed (relative to the earth)...

The max radius a fallling liquid drop can have without breaking apart is given by the equation: R=√(σ/gρ) where the rho is density of liquid (1000kg/m^3), and the surface tension is .7275J/m^2. g is gravity I am asked to determine the max radius of a drop in units of cm at 20...

when flowing fluid passes through throttling there is a drop in pressure and also there's a drop in temperature why?can anyone help??

A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof 2.00 s later. Air resistance may be ignored. (a) If the height of the building is 60 m, what must be the initial speed of the first ball if both are to hit the ground at the same...

This problem has really been bugging me. After several attempts, I don't even know where to start anymore. A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof 2.00 s later. Air resistance may be ignored. (a) If the height of the...

Help! Voltage drop is driving me insane! 1. If the Voltage Drop across a load increases due to its added resistance, what happens to the voltage drop across other segments on the circuit? 2 Why does resistance decrease Voltage (create voltage drop) if the Voltage is a Force "APPLIED" to the...

For pipes head loss causes pressure drop. If there is lower pressure at the end of the pipe, is the velocity lower? What I'm trying to figure out is if the average velocity in the pipe is constant. And how does it change if you place an object inside the pipe? Does velocity only change with a...

Hi all, Here's the problem! I am attempting to create a leakage current test suite. Basically it centers around cutting the voltage reference supply to a capacitor and measuring the voltage drop. Similar to the one in the attachment. I figured that to determine the drop it would be a...

Homework Statement A quantum mechanical particle with mass m and energy E approaches a potential drop from the -x region, where the potential is described by: V(x)=\left\{\stackrel{0 textrm{if} x\leq 0}{-V_0 textrm{if} x> 0}. What is the probability it will be reflected by the potential...

I am on home oxygen and receive the gas through a 50feet long tube about .1" inside diameter.If the Machine delivers a flow rate of two liters per second, what is the pressure drop through the tubing; What is the flow rate at my end of the tubing?

I was just looking for some insight on this problem. It is not a homework problem, my boss just asked me to figure it out. Now, there is 120V supply, with 600 feet of cable (copper) running to a load, and 600 ft neutral coming back to the supply. Ignoring the resistance of the load, he asked...

I’ve been searching for an answer to this question on the web for 3 hours. Thought I would find it quickly, but, noooooo. I’m trying to understand why crankshaft torque falls off at low RPM in normally aspirated piston engines. I think I understand the high end of the torque curve OK. At...

Im going to college first year in sept for Mechtronics and I am reading in advance for electricity which i know is guna give me problems. Right now I am stuck on this question. Dont tell me the answer but rather how if find it. 27) A 6V source is connected to a 100 ohm resistor by two 12...

Hi, I am having difficulty understanding why potential must drop completely over a circuit from the high side of the source to the low side of the source. I've seen this statement in several books now with no further explanation other than "it must". Consider a simple dc circuit consisting of...

1. A bullet is fired horizontally from the roof of a building 100. meteres tall with a speed of 850 meters per second. Neglecting air resistance, how far will the bullet drop in 3.00 seconds? 1) 29.4 m 2) 44.1 m 3) 100. m 4) 2,550 Since the horizontal speed should be constant throughout, so...

According to the US government Consumer Price Index, the price of gasoline dropped in April. I kid you not. I was a 0.2% drop. So how many of you experienced this drop in April? Some areas must have had a BIG drop to compensate for the BIG rise in my town.

Homework Statement a 200 volts battery is connected to three resistors as shown, see attachment. a) what is the potential drop across the 32 ohm resistor? b) the 10 ohm resistor is immersed in 60 grams of water at 20 deg celsius. how long much current flow for the water to reach 40deg...

Homework Statement the capacitor is originally charged to 100 volts. the switch is closed at t=0. how long does it take for the current to drop to 0.068 amps? circuit drawing attached Homework Equations capacitance C = Q/V where Q is charge, V is electric potential V = IR where I is...

Before I go too indepth, I wanted to make sure this was the proper place to post this. I stated in my intro I am doing a co-op work experience. I am working at a sawmill, and I have been asked to look at a few situations and things like that around the mill. I have been here for a couple weeks...

Homework Statement You would like to check if the battery voltage drops while it is supplying a current of 6A. You use a voltmeter designed to measure voltages up to 20V and having a resistance of 50,000 Ohms. See attachment**** This connection is in series so V= I (R1+R2) V / (R1+R2) =...

http://space.newscientist.com/article/dn13975-dark-energy-imaged-in-best-detail-yet.html Ever since accelerated expansion was observed in 1998 some people (like e.g. David Wiltshire) have been working hard to think up alternative explanations that could account for the observations without...

I am looking formula to calculate pressure drop in a liquid pipe and to determine a suitable diameter of pipe to use for the application.

Milikan's oild drop experiment is a famous experiment to dertermine the charge on an electron. In order to perform the calculations it is necessary to solve the equatuion that describes the speed of small drops of oil falling under gravity. This equation is: dv/dt = 9.8 - Cv/D^2 Where C=...

Hi I am currently doing physics a level and am in a spot of bother not knowing what to do next. Homework Statement My data analysis is to project a ball bearing down a curved ramp and off a 0.952m desk. After obtaining the results of how far away the ball lands I am now attempting to comapre...

Is the voltage drop across the emitter in an NPN transistor equal to 0? What is the purpose of RE (found immediately after the emitter?)