Weight Definition and 1000 Threads

Homework Statement Imagine standing on a scale and riding in an elevator at constant speed in a radial direction from the center of the Earth to a distance 3RE above the surface- I'm supposed to plot weight vs time so what I'm looking for an equation(s) I can use to find weight. *Assuming...

I work in the IT department for a small mining company and recently discovered during some product research that one can determine the weight of material in the bucket when given the following: The angle of the boom The angle of the arm The orientation of the chassis The hydraulic pressure...

Homework Statement A rectangular prismatic box, which is floating on water has a length, L=1200 mm, breadth, b=800 mm, height, h=500 mm, and a mass of 52.00 kg. When the box is loaded with the suspended hexagonal mass, the depth of its immersion is 300 mm, and when the mass is placed inside...

Hi, In a similar vein to the weight of flying birds in a sealed van etc. Let's say a woman weighs exactly 10 stones 7 pounds on the morning she is due to give birth. She starts to dilate etc. and heads to hospital. She gives birth to a beautiful baby girl weighing in at exactly 7 pounds...

Homework Statement Determine the specific weight of water at a pressure of 100 KN/m2 absolute and 10˚C temperature. Homework Equations I was thinking it's p=γh The Attempt at a Solution But there's no height?

Homework Statement This isn't exactly homework...but I'm not sure where to post it. I was reading a textbook, and got myself in a mental predicament. I understand the reasons the book gave, but I want to *really* understand. So my question: "Why does air resistance decrease as the...

Just started with physics, I am not very good. Homework Statement A weight with the mass m is hanging in one thread (C) that is connected to two other threads (A and B). Thread A is completely horizontal, while thread B is forming a angle of 45° with the horizontal plane. All threads are...

I am currently working with Lie algebras and my research requires me to have matrix representations for any given Lie algebra and highest weight. I solved this problem with a program for cases where all weights in a representation have multiplicity 1 by finding how E_\alpha acts on each node of...

Homework Statement An easily moveable, thermally insulated piston of negligible mass confines a sample of air of volume ##V_0=8\,\, \text{litre}##, at a temperature of ##T_0=300 K##, into a thermally insulated cylinder of cross section ##A=1\,\,dm^2##. The cylinder is fixed to a horizontal...

Is there any particle in physics that has a constant weight regardless of the environment it is in, with respect to gravity? something like light, roughly 300000000m/s always, but in terms of weight instead of speed. Everything that I have seen at this point is always relative to something its...

How do I calculate the acceleration of the falling weight? It is hanging from a string which goes through a wheel, and is attached to a sphere with thin walls. The string doesn't stretch and the wheel and the sphere spin without friction. The fact that the weight is connected to multiple...

Q. In order to estimate the total weight of rice of 100 bags, a sample of 25 bags was weighted, giving the average weight of 50 kg. If the population standard deviation is 1.5kg, estimate the total weight of 100 bags and find the standard error of the estimate. Sol: Here sample mean is 50. So...

Homework Statement A cord 7m long has its ends tied to a horizontal board 5m apart. A weight of 50 N is suspended from a ring so that the weight is free to slide along the cord in a vertical plane. A horizontal force pulls the ring to a position such that the cords on either side of the ring...

Dear Advisor, I tried to read books and searched all around before posting new topic here... I'm carying out testing a hoisting winch at load 400 kN through a system as in picture. My problem is that due to fiber rope i only can measure exactly wire tension by a load cell installed through...

Hi all, is my solution correct? I was rejected because of this... Homework Statement Consider a mass point (mass = m) constrained to move on the surface of a sphere (radius = r). The point is subject to its own weight's force and to the elastic force of a spring (elastic constant = k, rest...

A sphere weighs P kg what is the weight of the higher straight circular cylinder that can cut from the sphere? Answer sqrt(3)P/3

I have a basic question concerning strength and weight of materials. Please forgive me if my question is extraordinarily naive, but I'm an elderly retiree and my education is woefully lacking in this area. Thank you for your patience and understanding. Let us say we have a block of X material...

Homework Statement AB is homogeneous with mass of 180 kg, goes 1.2m in the page and is hinged at A and resting on aa smooth bottom at B. All fluids at 20 C. Find height of water that will result on 0 force at B Homework Equations M_s = \int\int_s \ (\vec{r} \times \hat{n} )PdA...

Homework Statement A particle is connected to a spring at rest. Because of weight, the mass moves a distance \Delta x. Calculate the value of the elastic constant k Homework Equations U_{PE} = \frac{1}{2}k\Delta x^2 U = mgh F = ma (in general) F = kx (Hooke's Law) The Attempt at a...

Mechanics -- factored self weight of an object How would you find the factored self weight of an object, suppose you are given the the dimensions and mass per metre of the object. Would you find the unit weight first by multiply by 9.81 and then multiplying the volume to find the UDL?

Homework Statement a worker who carries blocks of cement from a flight of stairs to an apparatus that is 8 meters high. Every block weighs 1.50 x 10 to the second power Newtons and the worker carries 2 blocks every minute. How much work will he realize in 10 minutes and in 60 minutes...

Hi there Just wondering: all objects fall at the same speed, right(not taking into account air resistance)? So if I dropped a feather and a bowling ball on the moon, they'd fall at the same speed. So far so good. But my physics book's definition of weight is "The weight of an object is the...

I have a table and I want to get the weight of the table. I only have one scale. I weighed the left side then the right side. I believe this is a simple statics problem but I can't figure it out. I have broken this down into this: A beam with points A, CG, and B. A is the left side, B is the...

if i am holding a motor in my hand and the moter is lifting some weight (electrically).Will i feel the additional weight?

Hello, I know there are many different representations of temperature, there's 4, 1) Fahrenheit 2) Kelvin 3) Celsius then there's 4) T = 460 + F In my fluid dynamics review book To calculate specific weight γ= P(pressure) / (R * T) = lb/ft^3, it explained that T should be...

hey, So i need a formula that will help me calculate the torque required to run 2 wheels that support a certain weight. The things i know are follows: Total weight of the vehicle: 650-700kgs Wheel Diameter: 16-17 inches Average Velocity i will require the vehicle to move at: 10m/s...

I am not a physics professional. I have just found an interest in physics on my own. My question is as follows: Imagine a 50 pound weight here on earth. It's mass has a weight of 50 pounds in 1g gravity. This mass, weighing 50 pounds, has a certain amount of resistance to acceleration...

I have two closely-related questions, which are probably just one question: 1. On the National Weather Service website (http://www.srh.noaa.gov/jetstream/atmos/ll_airweight.htm),it says "When we measure air pressure, we are measuring the weight of a column of air 15 miles (24 km) high...

Hello all. I need to build a weight supporting structure with the following requirements. At this point, I'm still in learning mode and need help understanding the appropriate terms and formulas to search for. Of course solutions are awesome too, but any direction forward would be most...

Homework Statement Draw graphs of weight against time for the following 1) man stands on scale very gently and then gets off again very gently 2) man jumps onto scales and then jumps off again 3) man stands on scale and let's his knees unlock so that he drops, then stops. For each of...

Homework Statement In this project, the methodology of Finite Elements and convergence of numerical solution is explored. A cable has the following properties: weight per unit length of wo = 5 N /m length l= 24.2m The cable is suspended with its two ends a distance of L = 20 m...

Hey guys I found this forum and very informative i must say. My question is i found a similar thread but i am wondering. I am building a punching bag frame for 14 punch bags between the weight of 100-120lbs. The span is 23' by 20'. The span of 23' will be broken up with a support in...

Firstly, I am sorry for what is likely stupidly simple question however I can't find a helpful answer in Google so I must be missing obvious. Can you determine the initial force that moved an object by knowing only its current velocity and weight? So if a 1kg object is moving through space...

Hi! For my finally year design project, I intend to try and solve the problems with existing shower bathing aids for the elderly and disabled. I won't go into details of what problems and how, etc, but I will give you an overview of the mechanism I intend to use. My product is essentially...

Homework Statement A diver weighing 784 N stands on a diving board 13.6 m above the surface of a pool. The diver steps off the edge and falls into the pool. The pool does -12290 J of work on the diver. How far below the surface of the pool (depth) does the diver reach? Homework Equations...

Homework Statement I am trying to determine the apparent weight while on a trapeze/pendulum. So far, I have heard that the apparent weight is either: a. the Fnet of all vertical forces (aka Centripetal force) and b. it is the force of tension. I am not sure which it is. Homework Equations a...

Homework Statement The density of iron is 8 times larger than the density of water. An iron block has weight 800 N when it is weighed in air. When the block is weighed when completely submerged in water, the apparent weight is... The answer is 700 N but I don't know how this is determined...

I really don't understand this concept: If an object is at rest initially. The object has mass 10 kg. Then if we apply 100 N (g=10m/s/s) in upward direction. How does it move in a constant velocity? Because the way I understand it, the object should be at motion initially to go in a...

First off Id like to say hello and I am glad I found this forum. Reading threw some of the threads, it sounds like we have a great group of people here. I am trying to come up with a way to calculate the amount of chocolate being held in the chocolate reserve tank at my place of employment...

1. In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 600N, to the top of the...

I have a large vessel that I would like to add a 10 psi purge to. There is a relief valve on it that is set to lift at 0.5 psi (essentially a flat circular plate 1 ft in diameter), so I am simply looking to keep this closed so that I can build up 10 psi inside the tank (don't worry, the tnak is...

A compound contains boron (40.3%), nitrogen (52.2%), and hydrogen (7.5%) - by mass. If 6.32g of this compound if dissolved in 100g of benzene, the solution freezes at 1.30 celcius. If the cryoscopic constant is 5.12 and freezing pt of benzene is 5.48, what is the molecular weight of compound...

Hi, I have been looking everywhere for an answer on what weight actually is so I joined the Physics Forum as it looks very promising. I have looked in many many places for a definition of the weight force and get completely different answers so I am now very very confused. All the textbooks I...

Homework Statement I need to find the weight of a person who has mass 71 kg, and is riding an elevator, at different time intervals. The intervals are 1,5, and 9 seconds. I was given a velocity vs time graph, so I'll try to describe as best i can: The graph starts at (0,0), the slope is 4/1...

Homework Statement A Ferris wheel has a radius of radius of 15.0 m. It rotates at a constant angular speed, and makes one full revolution in 25.0 s. Calculate the apparent weight of a rider (mass = 60 kg) when at the bottom of the wheel. r=15 T=25s v=(2*pi*15)/25 a=((2*pi*15)/25)^2/15...

Homework Statement Water falls without splashing at a rate of 0.230 L/s from a height of 2.40 m into a 0.630-kg bucket on a scale. If the bucket is originally empty, what does the scale read 2.90 s after water starts to accumulate in it? Homework Equations m1vi+m2vi=m1vf+m2vf The...

Hi, I measure weight of : column of water + water + effervescence tablet + cover (hermetic) When I put effervescence tablet (give a lot of small bubbles) in water and close very quickly the cover, the weight decrease of 0.2g with a precision of 0.01g for the weight-balance. The weight...

http://en.wikipedia.org/wiki/Topological_basis#Weight_and_character The 4th bullet says that if B is a basis for a top. space T, there is a basis B' that has a cardinality less than the weight of the space, but right before, the weight was defined to be the minimum cardinality of a basis...

Homework Statement The pressure in the tyres of a vehicle is 280 kPa. The contact area of each of the four tyres on the ground is 0.012m^2. Calculate the weight of the vehicle. Homework Equations Force = Pressure x Area The Attempt at a Solution 280 kPa = 2800000 Pa Force =...

Homework Statement "You are a 115-kg football player. You go stand on your bathroom scale, but the scale is not perfectly horizontal. It is instead inclined at an angle of 40° from the vertical (which makes it rather hard to stand on, but whatever). The scale is screwed into the floor so it...