Platform Definition and 150 Threads

Google invested $100-200 million in social gaming company. What does it mean for the future of gaming?http://stats.wordpress.com/b.gif?host=virtualnavigator.wordpress.com&blog=11498882&post=123&subd=virtualnavigator&ref=&feed=1 More...

Homework Statement A 78kg man, standing erect, steps off a 2.6m high diving platform and begins to fall from rest. The man comes to rest 1.7s after reaching the water. The acceleration of gravity is 9.8 m/s^2 What average force did the water exert on him? Answer: 1091.94 N Homework...

Hi, I have a problem that I am working on and I am running into some questions. The question states (the image is attached): This system consists of the disk D and the bar B that is welded at point Q. The other end of this bar is fixed at point O. Assume that the disk rolls on the thin...

Hello .I am a first year Engineering student we are meant to build and design a platform structure made from flour-based dough (kitchen concrete) that can stand on a smooth hard surface and support 2 kg. You may use up to 2 cups (250 mL each) of flour, with one hen’s egg (though some people say...

Homework Statement A platform moves up and down in SHM, with amplitude 0.035 m. Resting on top of the platform is a block of wood. What is the shortest period of motion for the platform so that the block will remain in constant contact with it? Homework Equations...

I'm planning on building a platform for Olympic weightlifting. I'm trying to minimize the weight, so I'd like to be able to properly estimate the sturdiness. The first one is for a piece of wood sitting on beams of some sort. I know that as the beams move father and farther apart, the board can...

I'm planning on building a platform for Olympic weightlifting. I'm trying to minimize the weight, so I'd like to be able to properly estimate the sturdiness. The first one is for a piece of wood sitting on beams of some sort. I know that as the beams move father and farther apart, the board...

Hello everyone, I have a degree in Computer Science/Engineering and have more recently been studying Physics. I've been really interested in the possibility of creating plasma in such an ordered state that virtual positrons begin to affect electrons non-chaotically and accelerate the electrons...

the frequency of radiation emitted when electron and positron are annihilated in the moving carriage is more than the the frequency of radiation emitted when the same experiment is done on railway platform .Is it not enough to decide that the motion of the train is real while platform motion is...

I'm trying to determine the most efficient method for a mining project I'm involved with doing with an expansion platform that expands and contracts repeatedly into different substrates (from sandy to gravel to dense muddy material). So whatever design I use will have to be able to open and...

hello, I have a simple question. a long vehicle' s velocity is 26 m/s , a person on the vehicle runs at -6 m/s, what is his velocity ? I think it is 20 m/s from an inertial frame However, imagine this situation, an elevator is at free falling and just before it collide it has 26 m/s and a...

This question is about a multibody kinematic describtion of a Stweart Platform. We are doing some experiments with a Stewart platform, which is a six-legged parallel manipulator and is well described in literature. You see this robot in my top figure. For the first situation I want to find a...

If a cylindrical tank of radius 1m rests on a platform 5m above the ground. Initially the tank is filled with water up to a height 5m. A plug whose area is 10-4m2 removed from an orifice on the side of the tank at the bottom.(density of water = 103kg/m3, g= 10m/s2). i wanted to ask what would...

Homework Statement An 80.0-kg man jumps from a height of 2.50 m onto a platform mounted on springs. As the springs compress, he pushes the platform down a maximum distance of 0.240 m below its initial position, and then it rebounds. The platform and springs have negligible mass. What is the...

Homework Statement I'm not given any signs of a correct answer in the book, so could I get a check here? A car is driven on a large revolving platform which rotates with constant angular speed w. At t = 0 a driver leaves the origin and follows a line painted radially outward on the...

I am just starting to learn about attitude estimation and control of a flying(or actually, a freefalling) vehicle. There will be inputs from accelerometers and gyroscopes, Kalman filtering to estimate the correct attitude and control algorithm to achieve the desired attitude. I am still...

How exactly do I compile and run C++ code in eclipse as though it were in pico? I've wrote code that I know works, just a simple "Hello World" program, but I can't figure out how to make the one file program run!

I'm not quite sure where the best place to ask this is so I thought I would start here. Anyway, I'm a member of an undergrad engineering research team. We are trying to figure out if there are any companies that might make some type of a prefabricated test stand or platform for experiments. We...

A large horizontal circular platform (M=120.1 kg, r=3.45 m) rotates about a frictionless vertical axle. A student (m=73.3 kg) walks slowly from the rim of the platform toward the center. The angular velocity w of the system is 3.9 rad/s when the student is at the rim. Find w (in rad/s) when the...

Hey all, I trying to get somewhere with the following problem and am not having much luck. Any tips or suggestions would be appreciated! I found that the block leaves the platform at y=2.5 cm though. A platform is in SHM in the vertical direction with an amplitude of 5cm and freq. of 10/pi...

Hey all, I trying to get somewhere with the following problem and am not having much luck. Any tips or suggestions would be appreciated! I found that the block leaves the platform at y=2.5 cm though. A platform is in SHM in the vertical direction with an amplitude of 5cm and freq. of...

Hi, nice to find a physics forum. I had a quick question. I'm a television producer and developer, primarily in the unscripted TV area. We're developing a quiz show which utilizes a center circular platform. It's divided into thirds, with a different person standing on their own third...

Hi there, I have a version of WIMS-D5 code which cannot be run on Windows XP. Also I don't have its source code to recompile it. Anybody has a version of WIMS_D5 which can be run on WinXP? Thanks a lot.

A horizontal circular platform (M = 92.1 kg, r = 3.49 m) rotates about a frictionless vertical axle. A 73.3 kg student walks slowly from the rim of the platform toward the center. The angular velocity of the system is 3.5 rad/s when the student is at the rim. Find the angular velocity of the...

Homework Statement A point mass rests on a horizontal platform which can be made to describe vertical s.h.m. of amplitude 0.10m and frequency 2.0 Hz. The mass makes contact with the platform as it rises from its lowest point. At what point, if any, will this contact be lost? Homework...

I'm trying to build a book scanning platform, and I need a thin sheet of clear material which will be used to hold open the book in order to image the pages. I was contemplating using plexiglass, but glass is certainly an option as well. I am more concerned about the cost than anything. I...

I am designing a book scanner (I will be using a digital camera), and I need some advice for constructing a platform that will properly support large books. Through much research I have determined that a V-shaped cradle will be the best platform since this will tend to reduce the curvature of a...

Given: a platform which is 4m high. On the edge of it is a brick wall with height Y. The launch site is some way behind the wall. The landing site is past the wall and beyond the platform. The launch angle is 40 degrees. Find the range. x=vot cos @ (where @=angle) y=vot sin @ range=(vo^2...

pendulum! help! Homework Statement A pendulum 2 meters long with a mass of 1kg is mounted on a circular platform on the Earth's surface that's spinning at constant angular velocity. The pendulum is mounted on a pole that's perpendicular to the platform at a distance of 5 meters from the...

1. A child of mass 25kg stands at the edge of a rotating platform of mass 150kg and radius 4m. The platform with the child on it rotates with an angular speed of 6.2 rad/s. The child jumps off in a radial direction. (a) What happens to the angular speed of the platform? (b) What happens to the...

Homework Statement What is the maximum acceleration of a platform that oscillates with an amplitude of 2.70 cm and at a frequency of 6.40 Hz? Homework Equations a(t)=-\omega^2x_m\cos{(\omega t=\phi)} \omega=2\pi f The Attempt at a Solution a(t) will be maximized when a'(t)=0 (or...

I need to know how to figure out the moment of inertia of a system that consists of a spinning circular platform with a student standing still on the platform. I figure that it would just be the sum of the moments of intertia of the platform and the student. I can figure out the platform's...

A massless platform is kept on a light elastic spring. When a particle of mass 100g is dropped on the platform from a hieght of 24cm it strikes the platform and compresses the spring by 1cm. From what hieght should the particle be dropped to cause a compression of 4cm? [text book answer: 396cm]

This is a "paradox-type" relativity problem that I cannot figure out. Hope it's OK to post this here. Sorry for English errors, it's not my native language. Here it goes: Railway. Platform (1 km) by side of it. Train (100m). Train approaches platform very high velocity, so that (in train's...

I have been working on this problem for an hour and can't seem to figure it out. I know there must be something fundamental that I must be doing wrong. Can someone give me a pointer? A platform of mass 0.8 kg is supported on four springs. A chunk of modeling clay of mass 0.6 kg is held...

I recall my teacher explaining this concept in class, but he did not go over how we would solve these types of problems: Bob the monkey (20 kg) is on a small platform (2 kg), which is attached by massless rods (R = 3m) to a frictionless pivot, and initially at rest...

Mmmm if it's not too much of a problem could someone help me with the following question?: A late passenger sprinting at 8.0m/s is 30.0m away from the rear end of a train when it starts out of the station with an acceleration of 1.0m/s^2. Can the passenger catch the train if the platform is...

Hello all, I am working on a question as part of an assignment, and while I think I have the correct solution, would just like to check if I have gone about this the right way. Question: "At the beginning of each term, a physics professor named Dr. Zeus shows the class his expectations of...

A platform of mass 0.8 kg is supported on four springs (only two springs are shown in the picture, but there are four altogether). A chunk of modeling clay of mass 0.6 kg is held above the table and dropped so that it hits the table with a speed of v = 0.9 m/s. The clay sticks to the table...

I wondered if you could float into space on a balloon. After a quick search on Google I found an answer that left me with more questions. This is what it said:"Could a helium balloon float all the way up into space? A helium filled balloon can float very high up into the atmosphere, however...

A platform of mass 0.8 kg is supported on four springs (only two springs are shown in the picture, but there are four altogether). A chunk of modeling clay of mass 0.6 kg is held above the table and dropped so that it hits the table with a speed of v = 0.9 m/s. The clay sticks to the table...

Hi there. I have got very good help from this forum in the past and I have yet another question. Take a square platform with a thruster at each corner. Put a weight in the centre of it. Now, with the weight in the centre the platform is stable but as you move the weight to one side the...

How do I run a Perl program from a Windows platform? I installed Collie Perl Shell for the text editing, and I installed ActivePerl for Windows... but.. what part of ActivePerl should I use to give command lines to run a program? :rolleyes: I've been going through the user guide, but it's...

An 80 kg person standing on a 20 kg plateform is suspended by a rope passing over a stationary pulley that is free to rotate. The other end of the rope is held by the person. The masses of the rope and pulley are negligible. You may use g=10 m/s/s. Assume that friction is negligible and the...

The Question: A 45kg child runs at 3.0m/s and jumps tangentially onto a stationary merry-go-round. The moment of inertia of the merry-go-round is 360 kgm^2 and the radius is 2.0m. What is the angular velocity of the child and the merry-go-round? My attempts: I'm not sure how to...

Hi my problem is I have a platform that is rotating and it \omega_0=8\pi and the question is how long does it take it to stop. All my work up to here is correct and I have \sum\tau=I\alpha where my \sum\tau=3.75Nm and I=1.91kgm^2 and \alpha=1.96rad/s^2 so I wanted to use the \omega=...

Here's the question that is giving me problems PLEASE HELP! Leg Presses. As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. When you push the platform, you...

A person stadns on a platform, initially at rest, that can rotate freely without friction. The moment of inertia of the person plus the platform is I_p. The person holds a spinning bicycle wheel with axis horizontal. The wheel has momemnt of inertia I_w and angular velocity \omega_w. What will...

This is a new launch plaform idea to assist Nasa in meeting it's extra-planetary goals. It seems that a large helium-supported platform in the upper atmosphere could save a lot of launch energy and pollution. The platform might be quite large, perhaps 0.5 to 2 km in diameter, and could be...

I have no clue on this, I am stumped anyone have an idea. a platform is rotating at an angular speed of 2.2rad/s.A block is resing on this platform at a distance of 0.30m from the axis. The coefficient of static friction between the block and the platform is 0.75. Without any external torque...