Weight Definition and 1000 Threads

Homework Statement A pickup truck has a mass of 2400 kg when empty. It is driven onto a scale, and sand is poured in at the rate of 150 kg/s from a height of 3.0 m above the truck bed. At the instant when 440 kg of sand have already been added, what weight does the scale report? Homework...

Homework Statement The weight of an empty balloon on a spring balance is w1. The weight becomes w2 when the balloon is filled with air. Let the weight of the air itself be w. Neglect the thickness of the balloon when it is filled with air. Also neglect the difference in the densities of air...

What is the weight of the wretched Bananas in Newtons? I'm so confused... Ok so I tried to list out all of the stuff I was given. Spring constant: k = 16.0 N/m Amplitude: A = 0.2 m Maximum speed: v = 0.434 m/s Maximum Kinetic Energy = Maximum Spring/Potential Energy (1/2)mv2 = (1/2)kA2...

Homework Statement A satellite of mass M = 683 kg is in circular orbit at height ho = 6.15x106 m above the surface of the Earth. Find: w, the weight of an astronaut of mass m = 75.5 kg inside the satellite. Homework Equations I believe it's something like: F = Gm_1*m_2/r²...

Hey guys, let's say I were to define a new mathematical object, a novel type of number for example, and I am trying to determine its various properties (arithmetic, exponential, logarithmic, etc). Now, let's say I am able to use these numbers to produce solutions that agree with expected...

Supposing two cubic containers with perfectly reflective interior surfaces. In one there is 1 mole of some gas and in the other is an equivalent number NA of photons of some frequency. We put the gas on a scale and the scale registers the total weight (mass) of the enclosed gas. But...

Hello to the Forum. I just started doing some very light weight lifting and decided to do a rough calculation of how many calories I might be burning during each of my workouts, however the figure I arrive at seems too high by comparison with the numbers one regularly see bandied about. What...

I’ve been scratching my head (and working in ms excel) about the following for about 6 hours and would greatly appreciate it if somebody could help me. Basically, I am trying to figure out WHY the density of water is approximately one gram per cubic centimeter (at 1 atm pressure and 4 degrees...

Homework Statement Homework Equations Wnet = ΔKE F = ma The Attempt at a Solution I don't know how to break this information down into finding a velocity using these equations

I am using Triacetin as a plasticizer. It will be mixed with R45 resin and cured with an isocyanate. It is easy to calculate the amount of curative when the EW is known for the substances. I can't seem to find any such info on Triacetin. I can't find EW, hydroxyl number, hydroxyl value or %OH...

Homework Statement A 1 kg mass is hanging from a weightless string and is pulled by another weightless string to an angle of θ from the vertical. The string pulling on the weight is exactly perpendicular to Fg. When the horizontal string is cut, the weight swings 2θ. What is the tension...

So I came across a question on the internet and its confused me a lot. We have 200g of water inside a cup. We neglect the mass of the cup completely and assume no water is lost. We also assume that the gravitational field is uniform within our experiment room. So we place the cup on some...

Homework Statement Cold-roiled steel of high silicon content enables the designer to use higher operating flux densities with lower loss per kg. The higher flux density reduces the weight per kVA. Can anyone explain how & why does weight/KVA depends on flux density Homework Equations...

Homework Statement A snapnium-loaded toy launcher shoots a 22 g plastic ball. What is the launch speed if the snaptastic constant is 4.6×104 N/m3, with the units you found in part A, and the piece of snapnium is compressed 14 cm ? Assume the barrel is frictionless. OTHER INFO: A...

Hi I'm trying to balance any 3d system with various fixed weights by selecting the correct lift forces for points of lift an example system would be the following shape ( view from above , think a plane missing the right wing) where X is a point of weight and L is a lift point (also has weight)...

Hello, I was solving a vector & moments question as a part of my revision and got stuck somewhere. I really need your help.. some sub-questions are solved, please correct me if I'm wrong. Here's the question (Its kinda long) : The free-body diagram shows three forces that act on a stone...

Homework Statement An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 1220N. The coefficient of static friction between the box and the floor is 0.24. (a)What should be the angle between the cable and the horizontal...

Homework Statement An old, heavy wooden door leads to a basement storm cellar. If it requires 400N to lift the door by its handle and swing it open, what is the Weight (in N) of the door itself? (Also, there is a picture that shows from the hinge to the handle is 1.6m) Homework Equations...

Homework Statement m=55kg r=6400km The Earth's rotation increases so on a bathroom scale, it now reads that you weight 0. how long is 1 "day" on Earth? Homework Equations I keep trying to figure this one out, but with different ways I've tried, I put Fg as 0 and it basically...

weight of earth? can anyone tell me the weight of earth?

Pulley and Motor - Torque Problem Homework Statement When the motor in the figure below lowers the m = 1140kg mass, it produces a tension of 1.04E+4N in the cable on the right side of the pulley. The pulley has a moment of inertia of 79.7kgm^2 and a radius of 0.741m. The cable rides over the...

Hi guys. I'm trying to figure out how much water force is needed to push an object roughly 19 times heavier then itself. I think water is roughly 2lbs in weight to every 32 fluid ounces. any one think they can give me a hand?

It has been a long time since I have emersed myself in physics but I am trying to write a labview program that takes into account distance, speed, mass to calculate the KE of an activity such as running a mile or shorter distances like 40 yards. With the KE I am having trouble figuring out how...

I have learned that due to upward thrust of air, the weight of an object is reduced to some extent than the real weight. What about of the effect of air pressure or atmospheric pressure on weight? Should it not result in increase in weight?

Homework Statement In the illustration there is a hawser attached to the ceiling at points A and B. Attached to point C is a mass of 400kg. Find the tension in the hawsers AC and BC. Homework Equations The Attempt at a Solution I have no idea how to go about this one. I can't...

Homework Statement On a carnival ride, a girl of mass m stands in a cylindrical cage of radius R. The cage is spun about its cylindrical axis so that her speed is v. What is her effective weight?Homework Equations we= mg-ma wxe = mv/R2, wey = -mgThe Attempt at a Solution This is an example...

This isn't a homework problem or anything, If I don't think about the formula that I use, and just plug in numbers I get the right answer. But I feel like a robot doing so, and it bothers me. Homework Statement On a typical problem where a wedge sits on an inclines plane, I am given the...

Homework Statement If a body is charged by rubbing it, its weight a) may slightly increase of slightly decrease b) increases slightly c) decreases slightly d) remains constant Homework Equations The Attempt at a Solution I know weight is nothing but gravitational force...

Hello Everybody, I am working with Pathria to learn statistical mechanics, and in page 141 a quantity already defined in 129 makes a reappearance; it is the statistical weight factor. My question is, what is it? What does it mean? To be more precise, what does the following equation in...

Homework Statement Why is weight positive if gravity is negative? Homework Equations W = mg The Attempt at a Solution So say there is some weight of an object, and the object's mass is multiplied by the acceleration due to gravity pointing downwards, so the weight becomes negative...

Why did Mendelev order the elements according to their atomic masses rather than their atomic number? Why did Mendelev not include noble gases in his periodic table?

I am working on an engineering project for college and have run into an unexpected wall. I thought that my approach would work, but I'm not sure if I am getting reliable results and wanted to check on the proper method. I am trying to calculate how long it would take a mass to accelerate...

Homework Statement The gravitational acceleration at the International Space Station’s altitude is about 93% of its surface value. What’s the weight of a 72 kg astronaut at this altitude? Homework Equations w=mg where w is weight m is the mass g is the gravity's acceleration...

Homework Statement What is the apparent weight of a 730-N astronaut when her spaceship has an acceleration of magnitude 2.0g in the following two situations. a) just above the surface of Earth, acceleration straight up; b) far from any stars of planets? Homework Equations Fnet=N-mg=ma...

Determining the weight and angle of an object -- Help please 2. The leg and cast in the figure below weigh 158 N (w1). Determine the weight w2 and the angle α needed so that no force is exerted on the hip joint by the leg plus cast. w2 = ________ N α = ________ ° OK so I figured...

Homework Statement A satellite sitting on the ground has a weight of 5000 N. When it is placed in orbit 500 km above the surface of the Earth (which has a radius of 6380 km), which choice best describes its weight? Very small but slightly greater than zero. Zero. Still 5000 N...

I've always had some trouble with these terms and using them interchangeably but I feel like I've finally made the clarification for myself. In the most rudimentary terms, it seems that the mass of something is the amount of "stuff" occupying it, whereas weight is the force of gravity on...

Homework Statement At the instant shown, point P on the cable has a velocity 12 m/s, which is increasing at the rate of 6m/s^2. Determine the power input of motor M at this instant if it operates with an efficiency of 0.8. The mass of the block A is 50kg. I've attached a picture of the...

Homework Statement At the instant shown, point P on the cable has a velocity 12 m/s, which is increasing at the rate of 6m/s^2. Determine the power input of motor M at this instant if it operates with an efficiency of 0.8. The mass of the block A is 50kg. I've attached a picture of the...

Watsup! I'm taking this nano class which is awesome but I am getting stuck on the gen chem material! no bueno. just want to make sure i did this right. Thanks! Homework Statement [/B] "A blend contains 45wt% polystyrene and 55wt% polypropylene. What is the mole fraction of polystyrene in the...

Homework Statement Determine the mean molecular weight of the Martian atmosphere which is composed of 95% carbon dioxide, 3% nitrogen, 1.6% argon. What is the gas constant for 1kg of such an atmosphere? Using the value for R from the last problem assuming the surface temperature of Mars is...

so I am going to use the potential energy law e=mgh to lose joules(fat) the problem is that what's the energy effiency of the body i can't find that anywhere. I am climbing a 22.5m apartment building and my weight is 114kgs (im not fat just big boned)

Homework Statement Straight out of the book: "An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 1100N. The coefficient of static friction between the box and the floor is 0.35. (a) What should be the angle between...

Homework Statement While taking an eastbound train to work, a passenger of fixed mass finds that she weighs 542N. On the way home she weighs herself again while the train is at full speed and finds she weighs 543N. If she works 50km from home, how long is her commute if she lives at 40°S...

Homework Statement A crane is raising a plank carrying two boxes that only differ in weight. The boxes weigh 10kg and 20kg respectively. As the plank tilts toward the heavier box, predict which box will start to slide first. Explain your prediction. Homework Equations Coefficient of...

Homework Statement The indicated location of the center of gravity of the 3160-lb pickup truck is for the unladen condition. If a load whose center of gravity is x = 21 in. behind the rear axle is added to the truck, determine the load weight WL for which the normal forces under the front and...

I am trying to build a helicopter. please help me. I want to know how much RPM and size of blade needed to lift 90KG of weight. I am planning not to use tail rotators, but I have a solution for this.

Homework Statement I've made my own problem here to solve. I'm wondering if it is even possible with linear programming. Basically, I need to designate these parts to certain machines based on 3 different priorities and each of these priorities are weighted arbitrarily. (For example...

Total "osmolarity" of blood? Curious about water weight vs. biological I've seen plasma osmolality described on wikipedia: http://en.wikipedia.org/wiki/Plasma_osmolality This looks at the concentration of electrolytes in the "plasma solvent". However, plasma is the liquid of the blood...

Original Problem: sin(45)(425N) + sin (60)(601N) = 821N The problem is, no scale is perfect. Let's assume for the time being that the angles are quite accurate, but you know based on your past experience that these scales can be off by as much as 2 N. This uncertainty propagates through any...