Weight Definition and 1000 Threads

Summary: How much weight can the bars support? Three one-meter-long bars with cross-section area A = 1 square centimeter support a rigid plate of weight W. For steel, E = 200 GPa and S = 400 MPa. Determine the maximum weight W the bars can support for three cases: (i) all three bars are...

Here, i have provided the description of the mean molecular weight from my course notes as well as my workings. I'm not sure about my values for X and Y. It states that X=1 if all of the hydrogen is ionised which i think the 1 represents 100% hydrogen but the core is also made up...

In class we do Science and I have faced with the problem between Weight and mass. Tutor told us that the weight is the force that causes everything to move. Mass is the kg .Why then, people ask other people what weight are you? Explain please. Thanks

When I place an object in a table, how is the weight distributed in the four legs? Is there an mathematical calculations for that?

Found myself wondering about this recently, though I can't recall the context. When Mendeleev proposed the periodic table of elements, I believe that it was known that atomic weights of the known elements were multiples of hydrogen's atomic weight. Presumably also with substances like oxygen...

Hello there, Given a Lie Algebra ##\mathfrak{g}##, its Cartan Matrix ##A## and a finite representation ##R##, is there a way of determining its highest weight ##\Lambda## in a simple way? In my course, we consider ##\mathfrak{g}=A_2= \mathfrak{L}_{\mathbb{C}}(SU(3))##. It is stated that the...

Hi, My attempted solution is in the image: I choose the edge on the left side, but the solution should be similar on both sides (just substitute C for A). (I missed to multiply by "g" in F_2.) Is this the correct way of thinking? I'm not sure about the distance "D".

Hey guys, so I am a little stumped on this problem. Can y'all help? I think for a) it is true but am not sure For b) I believe is is false because the angular acceleration would cause the angular speed to increase For c) I think it is true since acceleration is constant so T=ma is constant Does...

Let's first consider a cube side length a, mass m, Young's modulus of the block is E. How do we calculate the decrease of the height of the center of mass of that cube ?

Homework Statement A dose of 5 Gy of X-rays is required to destroy 63% of a particular bacterial population. It requires 1 Gy of beta particles of mean energy 1.0 MeV to accomplish the same result. What is the wR for the beta particles in this population of bacteria? Homework Equations H= (wR)...

Here is diagram for Tower Crane. The Rack weight P=700kN, and the maximum load capacity for this crane is W=200kN. The long beam length is 12 metres, and the balance object weighs Q. The short beam length is 6 metres. What is the weight of Q to keep the crane's balance at all situation?

I am a total physics novice, so please bear with me. I would like to know if it would even be possible to achieve this result. Assume I have a fixed abject like a table. Would it be possible to "redistribute" the weight of the table such that the front end of the table bears more of the...

When an object is resting on a surface such as the floor, there are exerted on it two forces: The normal force - force of the ground - and the weight (the force of gravity, the Earth pushing the object down), the forces drawn on the left. What are the forces on the right? Are they the same as...

I've been searching the web for an answer to my question without success, My question is... Is it possible to equate the gravity weight we experience on Earth with the PSI you would experience in places as deep as the Mariana Trench at 10,994 meters which would approx. equal 16,000psi? ex. Would...

Hello all, as my final project to attain my bachelors, I have tasked myself with designing some sort of device to collect insects from the canopy of soybean plants that can be suspended under a UAS (quad copter/drone). What I am trying to do is essentially build some sort suction device. The...

Ok so I've asked my physics teacher and a statics teacher as well and I couldn't get a straight answer from either. So here's my questions... Correct me if I'm wrong, but isn't the gram a unit of mass? Not weight? I thought that for mass to become a unit of weight, it has to have to...

I was 302 pounds now I am 271 pounds after three weeks of consistent dieting. I am wondering why have I lost weight? I eat basically one massive tuna sandwich a day and that is it and I eat everyday at the same time which is 12 o'clock. Also how much of this weight was water weight? Because I...

Is the weight of a small satellite in its orbit zero?

Is there any research or study which is to estimate the weight of genetics in preventing one or more diseases compared to other factors? A lot of time, for example, explaining how a particular kind of cancer occurs in someone, genetics is often mentioned, in addition to other factors, but how...

Homework Statement n the diagram below, the horizontal bar has a length of 4m. The force due to the wire angled at 30 degrees is 1200N. What is the weight of the horizontal bar? Homework Equations T=F⊥rThe Attempt at a Solution I know that I need to add the three( the bar, the wire, and...

Homework Statement A physics student . stands on a bathroom scale, calibrated in Newtons, while riding in an elevator. How will the reading on the bathroom scale compare to the normal reading for the following sequence of the elevator's motion? elevator starts to descend; elevator descends at...

Homework Statement [/B] 2. Homework Equations Fs = Nμ W = mg Fy = Fsin(θ) Fx = Fcos(θ) The Attempt at a Solution [/B] Hello all at PhysicsForums, I have a question on angled force and static friction. From my attempt below, I think I have found the maximum force required and would need...

Homework Statement A Ferris wheel 26 m in diameter rotates once every 14 s. What is the ratio of a person's apparent weight at the top of the ride to her apparent weight at the bottom of the ride? Homework Equations [/B] FNT/FNB = mg - mv^2 / r / mg + mv^2/r The Attempt at a Solution...

if I apply a force constant F=100N en ##y## direction to a body of mass 2kg, it is elevated 3m and I know that the force of gravity is in ##y## direction too. What is the work that I did? I think: ##W_{me}=(F_{me}-F_{g})\times 3## it is correct? and the work made by gravity is "0".

Hi - Question: A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated. (a) How much work does she do against the gravitational force ? (b) Fat supplies 3.8...

Hello everybody, I need a help, primarly a confirmation about my reasoning. I have data from a MonteCarlo simulation of collisions between particles at LHC (made with Madgraph). I have plotted some variables, for example the angle between two final leptons. Then I have normalized the plot to a...

What could be the method for measuring weight of gas in inflated balloon? Thanks & Regards, Prashant S Akerkar

how does vertical distance affect a given weight? for example...does one lb act heavier, thus requiring more force to raise, the higher its lifted? I want to know if 235lbs lifted 38 inches vertically takes the same amount of force to lift the same amount of weight (235lbs) 48 inches high...

1. The problem statement Consider the case of 10 oscillators and eight quanta of energy. Determine the dominant configuration of energy for this system by identifying energy configurations and calculating the corresponding weights. What is the probability of observing the dominant...

Hello and thank you for bothering to read this long mess . I have just finished high school and after researching the best universities for majoring physics I've decided to try getting admitted into MIT (I don't live in the states and my country [Israel] has mandatory military service so don't...

Hello! This is my first post here, and I look forward to many more! This is a sort of riddle I was told today, and left me full of doubts. So, the 'puzzle' was the following: " There's a man carrying behind his truck an enclosed trailer full of birds inside it. All the birds are standing on...

Hello all... I have a question about an engine-driven propeller. While a propeller is being spun, the air resists it and the maximum power of the engine will turn at "max rpm" when the drag from the air interacting with the propeller becomes equal to the torque generated by that engine. Now...

Hi, I have a pin-loaded pulley weight home gym machine. There are 9 weight plates that are 10 lbs each, so for each exercise the maximum weight that can be done is 90 lbs. However, there is a chart in the manual that shows the weight resistance for various exercises based on how many plates are...

So far I have not found a satisfactory answer anywhere on the internet for this one. I have read the "race car suspension class" section but could not find the bit I am interested in. I am trying to simulate vehicle spin out / oversteer by reducing traction on the rear wheels when cornering. My...

I am no basketball expert. I have never watched an entire basketball game in my life. However, several times in my life I have watched a few minutes of basketball games here and there enough so that I am familiar with the basics of the rules and objectives of each team in the sport of...

Homework Statement How to get the atomic weight of O atom 16g/mole to amu? Homework EquationsThe Attempt at a Solution As I know, 1 mole of O atoms = 16g 6.023 x 10^23 O atoms = 16g So, 1 O atom = 16 x 1/6.023 x 10^23 1 atom of O = 16 amu [1 amu = 1/ Avogadro's number] But I am confused about...

Does molar mass include an atomic weight for single atom and molecular weight for molecules?

I'm curious of what the weight of fuel would be to land and take off from Mars would be? I know it all depends on payload, but would it even be possible to blast a rocket from earth, with enough fuel to get to Mars, land on Mars, blast off from Mars, and then return to earth? My guess is that...

Homework Statement I have a roll of galvanized iron sheet steel. Its width is 19mm and thickness 0.25mm Density 7850 kg/m^3 Weight of the roll is 75kg I want to find how long would be the roll if its unwound. Homework Equations Density D = M / V Length L = V / A Area A = Width * Thickness The...

Homework Statement A force of 180 N is required to slide a loaded box along a horizontal floor. If the coefficient of friction is 0.32, what is the weight of the box? The Attempt at a Solution I'm not knowledgeable about any solutions able to retrieve the correct answer since the mass of the...

Has anyone ever looked for reversible weight changes while materials are subjected to uniform, strong magnetic fields, such as those involved in nuclear magnetic resonance imaging (MRI) or spectroscopy? I suspect no one ever has, for lack of a reason, and any such effects would have to be...

Hi, I am working on a project where the normal process has been to push a single linear plain away from a given area. I am now considering lifting the single linear plain away but wondered about the physical dynamics when comparing pushing to lifting something. In the image:- A. Represents...

Homework Statement A runner weighs 687 N and 71% of this weight is water. (a) How many moles of water are in the runner's body? (b) How many water molecules (H2O) are there? Homework Equations n = N/NA n= m/mass per mole NA = 6.022E23 F=ma H: 2*1 O: 16 The Attempt at a Solution a) 687/9.8=70.1...

Homework Statement Weight - 200kg RPM - 5 Diameter - 6m Homework Equations Moment of Inertia I = (weight/9.8).r^2 Torque t = I * (angular velocity / t) Power = Torque * speed The Attempt at a Solution First I calculate Moment of Inertia Using I=(weight/9.8) * r^2 = 183 kg. m^2 Then I...

Homework Statement A car traveling on a straight road at 9.15m/s goes over a hump in the road. The hump may be regarded as an arc of a circle of radius 10.4m. What is the apparent weight of a 665N woman in the car as she rides over the hump? Homework Equations ##F=ma##; ##a=v^2/r## The...

Homework Statement A) What is the weight (in Newtons) of an 80 kg person at the Earth's surface? B) What is the weight of the same person on the surface of the planet with a mass 8.0 x 10^24 kg and a radius of 5.5 x 10^6 m? (G=6.67 x 10^-11 N*m^2/kg^2) C) what is the apparent weight (scale...

Homework Statement Air consists of approximately 78% Nitrogen in volume, 21% Oxygen and 1% Argon. The atomic weight of Nitrogen is approximately 14, that of Oxygen 16, and that of Argon 40. Nitrogen occupies air in weight by (1) (a) 76% (b) 77% (c)78% (d)79% Homework EquationsThe...

I am trying to compare an experiment on spinal changes due to zero-g in astronauts. Researchers simulated zero-g spinal elongation by suspending human subjects so that no part of their body touched the ground. This figure shows the % change in disc thickness for each subject compared to data...

Homework Statement The surface of a liquid is just able to support the weight of a six-legged insect. The leg ends can be assumed to be spheres each of radius 3.2 × 10−5 m and the weight of the insect is distributed equally over the six legs. The coefficient of surface tension in this case is...

Homework Statement Determine the resistance of a 30 km long wire. b. Assume that the line transfers 1000 MW of power at a potential difference of 500 kV. What is the current through the wires? c. How much power is lost during transmission? What fraction of the transmitted power is lost...