Weight Definition and 1000 Threads

https://www.asi.edu.au/wp-content/uploads/2015/08/NQE_2009_Physics_solutions.pdf Pg 9 Q 11 A) Was wondering why there isn't a weight of water in the force diagram? The boy is submerged, as I understand. Do we normally include the weight of a fluid on someone or how does this work? For...

How scientists calculated the weight of Mars to be 6.39 × 10^23 kg?

Summary:: When filling up carts with iron the real weight deviates from the nominal value 10 ton. The standard deviation is .5. What's the probability that 25 carts exceed 255 ton? The arithmetic median value is: $$X \in N(25 * 10, 0.5 / \sqrt{25}) = N(250, .1)$$ $$P(x > 255) = 1 - P(x < 255)...

I initially attempted to get the answer by multiplying the mass by 50, as I assumed if the upward acceleration was 5g then the weight could be found by just multiplying the mass by the acceleration of 50ms^-2. However that resulted in an answer of 3750 which was far below the correct answer of...

I was trying to do some research to find the difference in power of different vehicles. Mainly the difference between a Large hauling semi truck A battle tank and a bulldozer like a d11t. Let's say I hooked up a chain to the back of each of these vehicles and rapped it around a large 3 foot...

Hey! 😊 We are given the following letters with the respective frequencies: \begin{equation*}\begin{matrix}a/2 & b/4 & c/7 & d/6 & e/4 & f/5 & g/8 & h/10 & i/3 & j/11\end{matrix}\end{equation*} For that I have applied the Huffman code and I got the following tree: Now it is asked for the...

As some simple Lie groups and their algebras are essential for our current understanding of QM, I wondered if especially the highest positive (or likewise lowest negative) root can be explained physically. The roots are the weights of the adjoint representation. Are their physical meanings...

What does it mean that the relationship between mass and weight is constant and proportional? I think I don't get it yet. The weight depends of mass, but at the same time depends of gravity, so if mass increase, the weight so does. But if we're on Earth we know that"g" has a value, therefore...

[mentor note: edited for clarity] The man weighs 100kg. All constructions, ropes, universal joints, rollers, fans, etc are massless. Friction between weight scale and feet or construction is enough to hold side forces... The red line is the rope. What will the weight scale show? <100kg...

Homework Statement:: If you have a 1" thick steel plate (A36) with a 1.125 hole (supported at 3" half way around), what is the maximum weight that a 1" grade 8 bolt can support using a 2 to 1 safety factor. The weight is applied directly the the bolt Relevant Equations:: dunno? it's been 24...

Let's say I am strong enough to lift a 100 kg dumbbell, but not strong enough for a 200 kg one. If I lift the 100 kg dumbbell, I suppose the chemical energy of my body tranforms into the potential energy of the lifted dumbbell. Suppose I'm trying to lift the 200 kg one. I'm pulling as hard as I...

Let me draw a free body diagram for the man. I assume that for both cases (a) and (b), the man pulls the block up with uniform velocity. (1) In case (a), realising that the man is in equlibrium (##\Sigma F = 0##) the normal reaction on the man ##N_a = w_M + T## is given by ##N_a = (50+25)\times...

Hello all I was hoping someone can help with the following problem. I am trying to create a parabolic formula to give me target weight. For example:- Day 1 = Target Weight 100kg Day 112 = Target Weight 67kg Each day is consecutive - can anyone help me to create a parabolic formula that goes...

I understand that the weight of the car does not change (assuming mass of the car stays the same) because of f=mg. But I am not so sure about of the aerodynamics of the car plays a role. Say, a faster car might have more air under their wheels and might exert less force on to the ground. Maybe a...

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Hi all I need to understand the following passage from Hall link page 78 : Some notation first: Basis for ##sl(2;C)##: ##H=\begin{pmatrix} 1&0\\0&−1\end{pmatrix} ;X=\begin{pmatrix} 0&1\\0&0\end{pmatrix} ;Y=\begin{pmatrix} 0&0\\1&0\end{pmatrix} ## which have the commutation relations...

Hello; I have a quick question that has me thinking. Please note that i don't much like working with imperial units because there is one too many polysemous words. Say i had a 1 lb weight hanging on a 1in diameter rope. (rope weight neglected) 1. Could you say that at any perpendicular cross...

Hello guys, i am building a ball launcher to proper a line of baits into the sea, the line has 25 baits, each bait weights 30 grams (about 1oz) ideal shooting degree seems to be 45 to get maximum range, What I would like to figure out is the ideal weight of the ball to achieve the greatest...

I have to assume that ##h## is the height of the body. The graph above shows how the apparent weight of the body changes as it is immersed into the liquid. In (a), after immersing the whole height of the body, the apparent weight ##W_{\text{app}} > 0##. Hence the upthrust ##U < w_B \Rightarrow...

We understand that the crucial thing about the problem is that the volume of water present in the three containers are not the same. Also, we note that in each case the weight of the container is the total weight of its contents. (A student might be confused as to why should be so - after all...

Equations provided: for a spring pendulum and m replaced with L and k with g for the same pendulum, but with no weight attached. Greetings I tried solving this by stating that the length is 0,50m (since no length of the spring is given) and turning around the equation for the spring...

The specific example I'm going to give is from a discussion I am having elsewhere, but the question itself, as given in the thread title and summary, is a general one. We have two couples, each of which has seven children that, in order, are six boys and one girl (i.e., the girl is the youngest...

The weight accelerating/pulling the trolley is changed and corresponding acceleration recorded. What I don’t understand is why the weight added/removed to the hanging weight is removed/added to the trolley

The total molar mass is ##M=\frac{dRT}{P}=\frac{1.98*0.08206*(63+273.15)}{750/760}=55.3454786\,g/mol##. We have ##M=aM_1+bM_2## where ##M_1## and ##M_2## are the molar masses of ##\mathrm{NO_2}## and ##\mathrm{N_2O_4}## respectively. If I consider ##n## moles, I'd have...

Hi new to the physics world and the symbiology is hard to understand completely. Attached is the work I've done to a final solution but I can't seem to get the answer in terms of only density of water and T1 and T2. Thank you for any assistance. [ Mentor Note -- Word file replaced with a...

Say Object-A weighs 100 lbs. In Figure-1, it's obvious that the weight distribution is even along the bottom edge of Rectangle-B. In Figure-2, ignoring the weight of the white objects, is the weight distribution exactly the same along the bottom edge of Rectangle-B as it is in Figure-1?

Homework Statement: An open tank with a rectangular side 1 m wide and 4 m high is filled with a liquid of variable specific weight, γ, with γ = 50 + 2y (N/m3), where y is measured vertically downward from the free surface. Find the magnitude of the force on the side of the tank. Homework...

Hello all I was hoping someone could clear up the units & difference between Mass and Weight. I live in the UK. I weighed myself today on the scale and the scale told me that I weighed 95kg. What bothers me is that if:- Mass - Is the amount of "stuff" I am made from which is measured in kg...

Hi, Just doing some informal research: what is the average weight of a full meal ( meaning it allows you to feel full after eating it) for a man /woman? Internet doesn't say much ; only found two posts both suggesting around 1lb . Anyone else know? Edit: My goal is to decide whether the price...

I'm all messed up on this problem. I see you can get the solution (74cm, as listed in the back of the book) by simply setting mgh=1/2kx^2, saying that h=x, and then adding 15 cm to that since that's the original length of the spring. This is the solved solution I was given. But now I think...

Hallo everybody, I am using a mesh-based-weight window generator. It is clear to me that the coarse mesh must cover the full geometry; my doubt is about the fine mesh. Is it possible to define the fine mesh only in a part of a geometry, for example telling to MCNP to make 5 bins between y1 and...

I am trying to figure out the total energy a system of falling buckets can produce, and whether it would be a system that can replace or enhance a system of turbines in a hydroelectric dam situation. I need to figure out the total energy that a system of buckets, suspended on a chain system...

I just posted a image due to overleaf newcommands and graph ok (a) if we use f(20) then the $B=0$ so their no weight gain. (b), (c), was a little baffled and not sure how this graph was derived...

Consider the double slit experiment performed on a extremely sensitive scale, whereby the whole device including source and detector is isolated. From energy conservation we would expect that the weight is constant in principle while the experiment is running. What would we conclude? That the...

Hello This is a really silly question but I have doubted myself and I was wondering if anyone could help. I have been given the following information:-I am trying to understand what it means when the title states Unit Weights? I thought these were density but density is kg/m^3 - whereas these...

Hello! I have 5 data points with errors associated to them ##y_i \pm dy_i## and the corresponding ##x_i## values (which don't have uncertainties associated to them). I need to calculate the difference between the first of these points, ##y_1## and the rest, and fit a straight line to it...

I've done this exercise twice now, the answer is 1.4m/s but I get 1.64m/s. It's too far off to be rounding error. 1. I don't use energy consideration, because I don't have a clue how that would work. 2. I still need to know what's wrong with my current way of solving this. Any help is...

I'm planning on lifting a submersed well pump that is hanging on a 80' 2" galvanized pipe. Total weight is estimated to be 447lbs based on: pump ~ 50lbs pipe 3.6lbs per foot water 1.36lbs per foot The plan is to use two pieces of wood (1 foot of 2x6) with two clamps to hold the pipe in place...

Summary: How to calculate weight on pedals? For example, a bicycle pedal manufacturer might say that their pedals have a max rider weight of 120kg (264lbs). First off, since the rider is sitting on the saddle, I'm not sure how this would really impact max pedal weight? Going forward, these are...

Fn= normal force W=mg W=(65)(9.8)= 637N Fn-637= -(65)(0.2*9.8) Fn= 509.6N I got the weight of the woman in the elevator, but I have trouble finding what the scale reads in kg. I was given the solution which read: a = (g-0.2g)= 0.8g W= 0.8g*509.6N= 52kg. My questions 1. why do I have to...

Thanks in advance to anyone that can help me solve this problem, its causing me a real headache. I need to transport a rather large frame that supports a large heavy item. The weight is not evenly distributed along its length. I know the various distances between the supports, the total weight...

I require to calculate acceleration of an object caused by a force of 100N acting upon it. The weight of the object is 0.5kg I'm using the equation F = m * a Is it correct to use weight of the object instead of mass in the equation. Will it yield correct results? Or would I need to calculate...

When a body accelerates down(climbs down) a rope, why does its apparent weight reduce? Oh wait, does it even reduce in the first case? If yes, is it because of the Newtons first law of motion, which states that a body in motion tends to be in motion and a body at rest tends to be at rest. So...

A ballistics-esque question. Suppose we are driving at ##x \text{ m/s}## and we have to suddenly brake. For students in driving schools they are told something along the lines of "during the braking, the body experiences ##y \text{ kg}## of force" or "the mass of the body is much higher than at...

Good afternoon everyone, I need help with a certain calculation. How much power is needed to pull a 250lb load up a 45 degree incline at 5 mph. I am working on a project at school and would like to know what kind of motor we can use. Thank you very much!

The Swing Weight of a golfclub = m * (r - 14) m = mass of the club in grams r = distance from the top of the shaft to the center of mass of the club in inches 6050 equals the swing weight D-0 But the formula for the angular acceleration of any object spinning around an axis is: ωdot = τ / I In...

For convenience, I have marked the C.G. of the sphere as ##G_S## and that of the bar only as ##G_B##. The C.G. of the combination is halfway between them, shown by the green ##G_C##. My answer is that the combination will rotate about ##G_C## (centre of the bar) as it falls. I wonder if I am...

How much faster will a bicycle accelerate forward if both front and rear wheel rims are changed for lighter ones? Power input, size, hubs, spokes tyres, Frame etc all staying the same. I can give you any sizes and weights needed, let me know what is needed for this calculation and I’ll reply...

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...