Drop Definition and 876 Threads

Hi, this is my diode: http://img201.imageshack.us/img201/2862/untitledmq1.png Ok, I know Vcathode < Vanode in order for the LED to light up through the current sent through it. Now, my question is, if the three Diodes are connected to 0v, Vanode > Vcathode, therefore the LED will light...

In a brownout the power company's voltage drops. Assuming the voltage drop is small, how would I figure out how much of a voltage drop it takes for a 60W light bulb to act like a 50W bulb? The relevant equation I am guessing would be P=V^2/R. I also know the resistance doesn't change. I tried...

I need some help with a question please. If a helicopter has a speed of 5.50m/s moving upward vertically and when at the height of 105m above Earth a box is dropped from the window how much time will it take to reach the ground?

i take all 4 subjects right now:chemistry,biology,mathematics and physics.and i know that math and chem the most important of all. i am feeling a bit pressure studying a level now.i will start semester 2 soon.so i am wondering should i drop 1 of physics and bio. but i am not sure which job i...

Ok here's the thing: I have the classic egg drop project, but am not sure how to get it to work, so here are the requirements/details: The egg is a gresh, raw, grade "A" egg, Egg cannot be completely encased within another material besides a zip-lock bag. Device the egg is in can't exceed the...

Lets say water was rising vertically up a pipe at a lower pressure and lower velocity. Is the pressure drop the same in faster and slower moving fluids or does slower moving fluid lose less pressure from pressure drop.

Hello Everyone, I am a High school student who would like for some of the senior members to take look at some of my workings and maybe help me out when I run into trouble. I am presently out of school for the summer, 2 more years of high school, left where I hop to go to University to become...

Hi, I was wondering if anyone can help me figure out how much voltage drop is happening in this particular scenario. Here is my work: Given 200HP motor at 480V that is 300 ft. away from the starter. %VD(3phase) = [12(1.73)(300ft.)(240A)]/[(Circular mil) * (480V)] x100 I use 12 for...

Hi everyone I'm stuck with a few questions hopefully I can get some assistance. 1) A student repeating Millikan's oil drop experiment to measure electronic charge used an incorrectly calibrated voltmeter and obtained the following values for charges on the drops: Charges on drop / 10^-19C...

which drop of water has more "force" to hit ground? wish to know which drop of water has more "force" when hitting ground? http://img93.imageshack.us/img93/9831/image20nh.png and perhaps some "simple" explanation why you think so. thank you :)

My school went to Physics Day at Six FLags Great America and we were asked to draw conclusions about the ride the Giant Drop. Riding the ride is not necessary for answering this question, just a knowledge of forces, etc. I have tried answering this question MANY times and it has always been...

8 A voltage of 3.0 V is required to operate an alarm circuit. Only a 12 V supply is available, together with a number of resistors. The resistance of the alarm circuit is about 1000 Ω. A student selects four resistors of value 10 kΩ and sets them up in a series circuit. The voltmeter...

Hi, I am new to the forums here, I have a radar detector that I want to hardwire and remotely view the lcd in my rear view mirror. I'm using cat5e cable to make the connections, the length is about 8'. I finally got the lcd in the rear view mirror and soldered all the connections. It...

This is a long shot, but maybe someone will know or can point me in the right direction. I'm looking for an experimental value for the contact angle between tetrahydrofuran (THF) with both mica and graphite substrates. I've done numerous googling and also did a search on the web of knowledge...

I was thinking about a question where when 2 similar objects with different masses were dropped from the same height that they would hit tthe ground at the same time. It then occurred to me if the same would happen if the objects were given a horizontal component. i.e if they were rolled off an...

Hi, I have a question on Newton's second law. I have a box in which an egg rests inside. Egg is surrounded by some sort of padding. A force is applied to the box. (Force has an x and -y component. Are my conclutions right? 1) Force act on the box, not on the egg. Applying Newton's...

Hello everyone I have a slight problem. I am confused on how you know what path current is going to travel and also what voltage sources your suppose to add up to a specific resistor. For example here is my picture, already solved: The directions where to find the value of ix, the orignal...

a ball is dropped from rest at the top of a 6.10m-tall building, falls straight downward, collides inelastically with the ground, and bounces back. the ball loses 10.0% of its kinetic energy every time it collides with the ground. how many bounces can the ball make and still reach a window sill...

First of all I would like to apologize if I am posting in the wrong forum. I couldn't really decide if this belonged in the general physics, homework, or engineering forums since it involves principles of physics, is technically an assignment, and also has to do with engineering. Anyways...

Hi, I appreciate it if someone can reply and help me out with this problem. A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof 1 second later. Air resistance may be ignored. (a) If the height of the building is H m, what must be the...

So, I just got this test back today...75. The avg was a 59 and the guy gave us a 10 pts curve so I got an 85, which is a B. Problem is, our teacher is a grad student (teaching a 300 level class) and I don't really like him. I lost 22 pts on one problem for doing a dumb mistake. I know it was...

Can some one help me with this Milliken oil drop problem. Data from a Milliken oil drop experiment are given below. Calculate the value of the charge on an electron from this data: Voltage needed to suspend drop (V) Drop diameter (microns) 103------ 1.1 44.7----- 1.2 127------ 1.6...

Can some one help me with this Milliken oil drop problem. Data from a Milliken oil drop experiment are given below. Calculate the value of the charge on an electron from this data: Voltage needed to suspend drop (V) Drop diameter (microns) 103------ 1.1 44.7----- 1.2 127------ 1.6...

Hey... need some help with this quesiton: A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 3.2 seconds later. Ifthe speed of sound is 340 m/s, how high is the cliff? multiplying 3.2 by 340 gets me 1088 m which doesn't seem right. How do I go about...

A ball is droped from a stadium.It hits the ground 2.29 seconds later.How high is the stadium?Do I use this equation?.5at^2(Thant is wrong isn't it?) How fast is the ball going when it hits the ground?(what equation do I use on this one?)

Hey, I know there are already many of this threads, but I checked them all out and none can help me in my project. Well, in my project I have limited amount of materials, and I have already tried out various designs with no success, so any help would be great. Here are the details: Drop...

I'm a senior in high school, and we were just assigned the famous egg drop project... Here are the rules/restrictions/guidelines that our teacher gave us: You will design a container for an egg that will keep the egg from breaking when dropped from a height of approximately 5 meters (we're...

I am studying Maths, German, DT and Physics at A Level. I just finished my AS exams and got my results. Now I need to decide which subject I am going to drop, and which subjects I am going to carry onto A2. The problem is, I have lived in Germany for 13 years, so I speak fluent german. I am...

I was scrounging through my bag and noticed i have an assginment due tommorow... basically i have to make a paracute to glide an egg to the grund. on the end of my strings should be a hook to attach to an ovular suspention module... what size material etc should i use... ? ty for ur help

When we put a coin on a boardcard and both the boardcard and coin put on a glass. when we hit the boardcard,why the coin drop down into the glass.??

hi i have fixed a simple circuit for lighting up a led.i have included a potentiometer. as the led is white i know that the voltage drop of the led is around 4v.when the potentiometer is at min resistance the voltege drop is actuallu around 3.8v.the problem is that when i turn the potentiometer...

Hi ! i'm looking for some paper about the liquid drop model, and why we can use the langevin equation (initialy designed for brownian motion) to describe fission process (here brownian particle is collective variable such as quadripolar momenta) thank you

HELP me PLease I have my final in my class tomorow and I am freaking out. it is an Egg Drop lad. we are droping it from 10m high and we can only use 200g (includes Egg)im not very good at physics and i have to get a good grade can someone give me an idea on what to make for my package? i can't...

yes this is an egg drop project once again, i had the idea to use helium balloons, but the problem is that the whole thing must fit in a grocery bag. only two balloons fit in a grocery bag! that can't carry very much! we can't use paracutes, otherwise we can do anything. i tried just now to cut...

hi, I just got my project from physics, and its that annoying, classic egg drop situation. I have a lot of restrictions, and its out of 20 points, so its pretty hard. I would LOVE it if anyone of you could maybe contribute any ideas and suggestions and such. Thanks a bunch! Restrictions and...

My 5th grade cousin is doing an egg drop experiment and my uncle and I came up with putting the egg in Oobleck. Will this actually work if done properly? We tested it yesterday and the egg broke on the third drop. The first drop worked as did the second, but both of those the balloon of...

a ball is dropped from a heright of 4m and makes a perfectly elastic collision with the ground. Assuming that no energy is lost due to air resistance, a) show that the motion is periodic b) determine the period of the motion c) is the motion simple harmonic? a) I know that periodic...

I need to drop an egg off my school bleachers. I can't use any kind if padding, cushining, or packing material. The entire egg may be covered but does not have to be. The contraption also needs to be of the smallest possible mass. Please post any suggestions that you can. Thank you all.

I know there are several other "help, egg drop" threads in this forum, but my case if slightly different so here it is. I'm dropping an egg (free fall) from about twenty feet. The restrictions for the carrier are: (a) carrier must fit inside of the dimensions of a 2.5 inch cube, (b) together...

i need egg drop designs it is due tomarrow and i have no clue what to do please help rules- max. 2 different packing materials, 3 materials in all, egg cannot be fully covered and must be able to be removed without having to undo anything, no helium baloons, egg must be raw, no parachutes...

egg drop tomarrow and no idea what to do i need help really bad rules- max. two different type packing materials 3 materials in all egg must survive drop from gym rafters if it brakes i get 0 egg will be raw no parachutes egg cannot...

Let us consider the following scenario. Water is pumped to high pressure, but the water then faces a fork in the pipe. Two pipes lead back to the pump: large pipe L and small pipe S. Since the water can flow through either pipe, the pipes are said to be in parallel. Since this is so, the overall...

I want to do a Drop Test Analysis of my structure(Honeycomb like a box) from a height of 20ft...with free fall gravity...can i simulate this analysis in Ansys...will i have to purchase some specific module of this analysis in ansys...what is ASTM standard for this particular test?

I have an egg drop design contest. Here are the rules: We have to drop the egg from classroom height (about 6 feet) and from gym height (about 13-15 feet). The capsule cannot weigh more than 550 grams and cannot exceed 7"x7"x7". The egg shell and the yolk have to survive. You are...

This might be a silly one, but I'm a bit stumped: Suppose you have a 6V battery and an unlimited supply of 1 ohm resistors. How do you drop the potential from 6V to 4V using the resistors? Off the top of my head I think you just put two of the resistors into a series attached to the...

One of my physics H-work questions asks, If one inch of rain fell on an one arce field, how many rain driops hit that field. I figure that each rain drop has a volume of .5 mL. Does this sound about right?

EGG DROP! woohoo! Hello all! I have been getting frustrated with this certain physics project... the materials are as follows: 5 sheets of computer paper 1 meter of masking tape 1 raw egg THAT'S IT! any ideas on how to make the egg survive? parachutes? baskets? i know you have to...

How would I figure out the answer to this question (what formulas)? Here are the formulas I've been using for this homework assignment: PEe = -qEd V = W/q V = -Ed C = q/V Question: An oil drop having a charge of 8 x 10^-19 C is suspended between two charged parallel plates. The...

Okay, here's the deal: I am doing an egg drop tomorrow in my physics class. We are allowed only 25 straws, and scotch tape to do it. What would be the most effective structure to use for this? By the way, my teacher didn't tell us of any limit on the amount of tape we were allowed to use.

i don't even know how to derive an equation for this problem i am confused if someone would just show me how to derive the equation that would be appreciated not looking for an answer just how to do it. A roller coaster is designed so that after a large drop, the cars enter a circular path...