Building Definition and 891 Threads

A ball is thrown horizontally from the roof of a building 54 m tall and lands 50 m from the base. What was the ball's initial speed? I have been set this question and I'm a little stuck...here is the information I have extracted from the question: sv = -54 sh = 50 v = ? a = -9.81 I...

A mercury barometer reads 700.0 mm on the roof of a building and 715 mm on the ground. Assuming a constant value of 1.29 kg/m3 for the density of air, determine the height of the building. . My setup was finding the difference in the pressures for mercury and get 15 mm Hg Then use Hg density...

Question; Why does the US have a large building dedicated to offence, or murder or war? Why not poverty reduction? Is this democracy?

A mercury barometer reads 740 mm on the roof of a building and 760.0 mm on the ground. Assuming a constant value of 1.29 kg/m3 for the density of air, determine the height of the building. Okay I understand to find the h I use the formula h=patm/densityxg, and P2-Patm=pgh yet I am confused...

:eek: how do you even start with this problem: A 50 story building is being planned. It is to be 200 m high with a base 40 m by 70 m. Its total mass will be about 1.8 107 kg and its weight therefore about 1.8 108 N. Suppose a 200 km/h wind exerts a force of 840 N/m2 over the 70 m wide face...

Help Needed Asap! Please! Hi! I need to solve the following problem before tomorrow.. otherwise I'll be in big trouble. :rolleyes: I've already discussed it with classmates, but they also don't know how to handle it. Please help me! Ok this is the question: A ball A is thrown off a...

Hey! Im 16 and love physics, but I am starting to get board with the regular school course and want to start a little project of my own, i thaught a coil gun would be a good start:biggrin: . Any way, I've looked on google on how to make one but all the instructions suck so i was wondering if...

ok, I am in grade 10, i haven't even started physics class yet, i am working up the courage to go to a very good science teacher dr. charington but i am afraid of his reaction when he hears i am building an RPG, the CO2 cartridge full of black powder placed inside the rocket will add a...

I was going to post this in biology, but then changed my mind and decided that I probably should post this in GD since the solution to this might not be a biological one, but might be something physical/chemical/technological. This is probably futile anyway, but does anyone know of a way to...

I received this problem in 8th grade goemetry today, and its due tomorrow. i have looked at it for 2 hrs now and STILL can't think of how to figure it out. help PLEASE? Here it is: If you filled a closet with stacks of quarters from floor to ceilling and then put all the quarters in one big...

My school district requires that each high school senior complete what's called a "Graduation Project," in which the student makes a project of their choice that relates to their academics. There's no specific requirements about the actual project, just the completion of different components...

How would i go about solving this? A man falls off a building with height D. He travels 1/4D in the last 1 second of fall. How high is the building?

I have done most of the work on the problem written below, but the more I look at it, the more I am not sure whether I should leave the pounds as they are instead of converting them to kilograms. If I leave it as 200 lbs, are the number plug-ins going to be wrong? I am using the formula g...

Hello, I am new, so sorry if this is in the wrong thread, if it is please move it. But anyways, I was wondering if there is a place online which explains how to build a trebuchet (preferably with Popsicle sticks)? Thank You

okay I know my the top of my head hasnt been exposed to much sun so it will burn easily since I shaved it BUT isn't it good that it gets SOME exposure to sun so that it will build resistance to it? Thanks

I need to simulate a test weight of between 10 and 20 Kg on top of a product. I am planning to do this by compression, via a steel plate directly attached to the arm of a pneumatic cylinder. The product, (and steel plate), dimensions are 5 1/2" x 1 5/8", (or 14cm x 4.1cm for you youngsters!). Am...

Building 7 was hit by no aircraft or debris. It had several small fires and amazingly collapsed in symmetrical fashion at free fall speeds. We saw in Madrid a building burn at intense levels for MANY hours but not collapse. Is there any scientific explanation for such a catastrophic...

Has anyone here ever built a small Jet engine? Just generally interested in how you did it and from what parts thanks

Through random chance, I decided one day that I would build a proton accelerator. I understand the concepts of the physics that are involved well enough, but the actual construction is a bit of a mystery. There is a surprising number of rescources on the construction, but they mostly involve...

can it be done? I am not engineer or anything and i was just wondering if it would be possible to build a railgun using batteries as the power source. my idea is to have around 25 electromagnets on two rails with an aluminum tube in the middle which houses the projectile. then each...

Hello! I've been working on this problem for a while and our book doesn't have a solutions manual. It has 4 parts to it and I've solved 2 already, (I think) and the last 2 are just getting to me. -A ball is thrown from the top of a building and is given an initial velocity of 30 m.s...

hi i wish to build a battery charger using a 3/4hp240voltac motor driving a 55amp car alternator will this work has anyone done this before and will my caravan batteries be oka i have a gen set to drive the electric motor all these questions i hope to be reveled rolly

Hello everyone. I'm finishing up my diploma in Computer Engineering Technology, and it is time to start thinking of final projects. Basically we have to build something that incorporates a microcontroller and we can do pretty much anything we want. I have decided to build an equatorial...

Hey, I never used to like electronics, but after doing a unit last semester it has really interested me. I've gone out and bought simple circuit components and have built a whole heap of simple circuits just because I wanted to learn more of how things behave. Anyway I still have the notes...

Greetings, its the noob again:) Recently I had a discussion with a friend of mine who claimed that he knew how to set up his own computer (putting the parts together, not making the parts themselves). When I asked him if he's ever done it, he said no, but he said that he knows what most of...

For my project I need to transform the power from a 3000 watt, 120V AC generator to a high voltage DC, say 30,000V DC. Are such transformers easily made or of low cost? Bob Clark

I'm Currently Making A Water Rocket And I Want To Obtain More Information About The Factors That Might Affect It From Launching Higher. Thanks For Your Help Really Appreciate It.

Can anyone provide advice for this? We will be putting them in the school's pool and racing them. But I really want some advice. (1) Formulas to find if the boat will float or sink (we'll be able to make measurements and stuff). (2) Plan ideas. (3) Stuff to focus on in building. We...

Does anyone can help me on this please? Ball A is dropped from the top of building at the same instant the ball B is thrown vertically upward from the ground.When the balls collide,they are moving in the same direction,and the speed of A is 4 times that of B.At what fraction of the height of...

Which of the following are true ? (a) Proteins range from a MW from about 3,000 to 1.0e6 g/mol (b) Fibrous proteins are the main component of Muscle,hair and cartilage (c) Building blocks of proteins are the beta-amino acids (d) Polar amino acid side...

Hey, I bought a Western Digital hard drive to put into an enclosure. I have an HP pavilion zv5000 notebook. I have no idea what jumper setting on the hard drive I should use. Should I leave it as cable select, move it to master, or call tech support? The box from the enclosure says...

If I decided to build a rocketship would you guys help me? How about if I made a totally safe wormhole connecting Holland, Colorado, London, and Guam? We could build it in my backyard. Sh*t we could go to the moon, and do the moonwalk, in a moonwalk, on the moon. We'd have to play football with...

Is there any free E-Book or online resources for building simple robots ?

Hey guys, I was wondering what is the best way to build muscle if I run the track. Is it wise to eat a lot of fat, then run my buttocks off for the muscle? Or eat light and low carbs and low calories? What becomes muscles then?

This thread is a continuation of my previous thread, except this one is primarily focusing on the contruction of an amp hour meter and programming it, rather than the gathering of parts for it. (since the parts have just arrived, very slow mail order) I am getting very confused when looking...

Seeing as the US is a good and nice capitalist system... and you seem to be able to buy practically anything otherwise... does anyone build WW2 aircraft? Wouldn't it be so cool to buy like an F4 Corsair... Hell if i had the money, id buy one just to stare at outside...

hello. i have to build a "quake tower" for my high school physics class. it must be made from bolsa wood and be able to hold something like 10 pounds and be put on a vibrating table and not collapse. has anyone ever done a project like this before? do you recommend any specific designs? any...

there is a three story building, with a total of 12 people in it. it rained. and the roof leaked. the people from the third floor asked the second floor people if they could go down to the second floor. the second floor people then said they could only acomodate (on the second floor) the same...

i am building a human powered boat for my physics class. does anyone have any design tips or powering mechinisms that could be of use? please help me!

does anyone know of recycleable materials (strongest and less dense than water) that can be used to build a human powered boat?

Hi guys! I need to design and build a traffic light with an accompanying DC power supply. The DC power supply must be a 5V source obtained from a 240V AC (50 Hz) mains source with a short circuit current of 200mA. This will be used to drive a digital logic circuit controlling the traffic...

Hello, I would like to build a basic automated robot. Is there any recommendations on what resources I should look at? Edit: Currently, my objectives for the robot is: -Ability to move along a 2-D flat surface (with wheels) -Able to pick up and transfer an erasor (using optical (IR)...

im working on building a simple thermal energy storage system...im using water as phase change material.The PCM will be injected into spherical capsules and dropped into a storage tank.Now my problem is that the freezing process initiates only at arnd -12 C.Remember it is under pressure...

Hi I'm trying to build a simple circuit but my physics is shaky. Could someone be kind enough to take a look at what I've done and notice any rookie mistakes? Thanks! The top side is positive.

Hey everyone, I'm building a rocket with my friend from scratch. I have calculated the specific impulse of the rocket engine that we have designed and it turned out to be around 235 Newton-seconds. I was wondering what the maximum weight of rocket this engine would get off the ground, and...

Does anyone have any tips on how to make/build a mouse trap car, with the mouse trap being the only source of energy? I have an idea of what it should look like, and how it should work, but I'm really not sure. Is there any helpful hints that I might need while building my project for my physics...

Does anyone know how to make a bone oscillator for the use of bone conduction? Thanks.

I'm building a cart which must be powered by TWO elastic bands only, it must ran at least 2 meters, which isn't hard, but my goal is at least 12 meters, which isn't very hard either(the longer the better). I have some ideas of how to power the cart and please help me to choose...

Does anyone know anything about building roller coasters on Roller Coaster Tycoon? We have to build them in Physics and I'm stuck on finding the sum of PE and KE for the model.

http://www.newscientist.com/news/news.jsp?id=ns99996781 "The construction of what will be the world's tallest building is set to begin in Dubai, United Arab Emirates" "The Burj Dubai tower will stand 800 metres tall - just 5 metres shy of half a mile - once completed in 2008. That will be a...