Torque Definition and 1000 Threads

Consider the diagram shown above. I came up with two ideas to solve this: i) I do not see any external torques about the vertical axis in this problem. so, angular momentum is conserved about this axis. (is it?) ii)the standard way, that is, writing newton's second law for rotation, and applying...

this is the diagram provided for the question I am familiar with the equation $$\vec{\tau} = \vec{\mu} \times \vec{B}$$ where $$\tau$$ is the torque experienced by the ring. However, I think that this is the torque experienced, about an axis passing through the center of mass of the loop. If...

Hi, I have the following question: Suppose you have an ideal rod and two forces of equal magnitude are applied to its ends, in such a way: Now it is obvious that the rod is in rotational equilibrium but my textbook says that for rotational equilibrium, the net torque must be 0 about any...

TL;DR Summary: Solved the biceps, but having trouble finding the reaction force now. I eventually calculated, using the moment, that the force exerted by the biceps is 1536 N (this is correct according to the model solution), but the calculation of the reaction force is more difficult. I was...

So please find both screenshots below taken from these youtube videos: Why in the first problem, the tension in the string, from which a mass hangs, is not included when the teacher is placing all torques in the equation (see image)? Why in the second problem, the normal force from the rod...

Relevant video ##\Rightarrow## Physics questions and answers My answer to Q.2 Let's break down the problem and solve it step-by-step: 1. Find the dipole moment (p): The dipole moment is defined as the product of the charge (q) and the separation distance (d) between the charges. p = qd Here...

I tried a method solving for the force of the wind first which I found to be 2842.95 N. From there I found the torque force using torque = F_wind x d, where I let d = 90ft. This leads to a torque of 77987.8044 Nm. From there I used Tension = torque/moment arm, with a moment arm of 20ft (half of...

The situation is shown directly below (Figure 1) The correct image configuration that mimics (Figure 1) is shown below.....that is to say it maintains the boundary conditions. I'd imagine the torque that the grounded sheet exerts on the real dipole is the same as the torque the image dipole...

Hello All, I'm trying to figure out the above problem but don't know how to set it up and could use some help. For starting with the first question, I was thinking of doing PE = KE: PE = mgh = (10,000)*(9.81)*(1) = 98,100 kJ KE = 0.5m (v^2) = 0.5 (10,000)* (v^2) Sqrt(98,100 / 5,000) = 4.43...

M robot = (125-25)lb* 1 ft = 25 lb*ft M arm = 25 lb * (x/2 -1 ) M load = 125 lb * (x-1) Mtotal =. 100 + 12.5 x -25 + 125 x -125 = 100 X = 1.09 ft but the correct answer is 1.82 feet, why?

I'm bothered by a winch being very slow at light loads and was wondering if a different motor / motor controller / gear could increase the low load speed without sacrificing the high torque at low speed? And also without destroying the motor? Is there a chance that the right combination of...

Hi I was watching this: How will we calculate various outputs? 1 Final toruqe? 2 RPM 3 Output shaft horsepower? Will it just be a sum of the individual motors, or will there be other things to keep in mind? Does the efficiency scale linearly? What issues will appear from a setup like...

Hi, I wonder if someone can help with the following problem? We have a sealed box in space and inside the box is an electric motor with the stator attached to the box. The rotor arm is attached to the inner race of a bearing and the outer race of the bearing is also attached to the box. There...

Need some help. Trying to lift a 10 lb box 20 feet. Hydraulic motor driven. Bucket attached to chain anchors on each end of the chain. 6” diameter sprocket on top and bottom, the bottom sprocket will be driven by a hydraulic motor. How much torque does the hydraulic motor need? Weight of chain...

I would like to discuss a few ways to apply derivatives in physics (I don't understand it fully). I don't need a full solution, I only need to understand how to successfully apply the derivatives First example, Thin insulating ring of mass M, uniformly charged by charge ##+q## has a small cut...

Initially I thought a good strategy for solving the problem would be to find the torque on the pulley to get alpha (angular acceleration) and then use alpha to find the tangential acceleration of the pulley which is equal to the block's acceleration. I'm not sure if this is correct. Let ##...

Let ##m_{r}=1## kg be the mass of the rod and ##m_{s}=0.5## kg be the mass of the sphere. ## \tau = -rFsin\theta ## ## = -r([m_{r}+m_{s}]g)sin\theta ## ## =-1.3(1.5)(9.8)sin30 ## ## \tau = -9.6 ## My book's answer key disagrees and my initial thoughts are that maybe the mass in my...

I suppose to keep the pulley from rotating the net torque has to be zero? Let ## F_{r} ## be the force that the 5 kg mass on the ramp exerts on the pulley and ## F_{d} ## be the force exerted straight down by the other mass on the pulley. Let ## r = 0.3 ## m be the outer radius of the pulley...

We are asked to find the tension in the rope. First from the first, we can assume that tensions in both ropes are equal, so we can treat them as a single rope since they are wound symmetrically. That “rope” will act tangentially to both cylinders so it exerts torque, the torque equations are...

Definition: Moments is a measure of turning effect of a force upon a pivot. My questions: What does it mean if it is a measure of moments? Does it mean the angle of turn? Does it mean the speed of the movement? Does it mean the distance travelled? Let's take a door as an reference.

If we had a wheel rolling without slipping down the inclined plane, kinematically its velocity would be 0 at the contact point to the ground since the rotational and translational components of velocity would cancel out. Speaking of forces, forces acting on body would be static friction and...

Hello! I was wondering if anyone knew a good explanation behind the physical reason for torque. As in why a force applied from a greater distance to the center of rotation is better at turning an object than a force applied closer to the center. The question seems obvious, but all I've been able...

In the Wikipedia article on counter-steering, it mentions a roll moment (torque) induced by precession: https://en.wikipedia.org/wiki/Countersteering#Gyroscopic_effects It states "The magnitude of this moment is proportional to the moment of inertia of the front wheel, its spin rate (forward...

Hi. I need your help! I have a college physics question Suppose there are pipes A and B. [Figure 1] I had to connect pipe B to pipe A, but pipe B was short, so I bent A by about 30 degrees and installed it. [Figure 2] It's a picture of the pipe A being installed by increasing the length in...

My AP Physics notes state that counterclockwise is generally positive and clockwise is generally negative. This makes sense to me and means forces on opposite sides of the pivot point which act in opposite directions will work together, and this is the logic I applied to answer the problems...

Hello, as you can tell by the title I don’t work with anything physics related nor do I study it. I’m trying to figure out if I can torque a nut without a torque wrench, and I have ZERO understanding in physics. And I need your help to tell me that I’m wrong. I want to try to torque the nut by...

The equation that connects final velocity with distance traveled is ##v_f^2 = v_i^2 + 2a \Delta y## Since the system starts from rest ##v_i = 0## and the above equation becomes. ##v_f^2 = 2a \Delta y## Since there is rotation in this system we need to connect ##a## to the rotation of the...

From the forces equation I can only understand from it that the forces' equations are:##N=Mg## and ##T\sin \theta=m\ell \ddot{\theta}##. But I don't know how to find the Torques' equations. Any help is appreciated. N=Mg ##Tcos⁡θ+N=mg

Rust belt fasteners on cars that have been in use for about 20 years, sometimes seize up and snap inside of their holes. I would like to avoid the frustration going forward of this happening by using anti-seize. How much should I adjust torque specifications by when using anti-seize? Looking...

Here's a picture the question provided. I tried solving this question two ways (assuming the axis of rotation is at the shoulder joint) and am getting wildly different answers. Some potential reasons there's a discrepancy: - I'm not super confident about my use of the torque equation...

Here's the picture of the situation described, provided by the question. Here's a screenshot of the work I have done. Here's a screenshot of the submission screen. The issue is that I have one attempt left and am not sure what I am doing wrong. Based on the hints, I feel like I'm...

Here is what I came up with First, let's compute the resultant force. $$F_{R,x}=F+F\sqrt{2}\cdot\frac{\sqrt{2}}{2}=2F$$ $$F_{R,y}=F-F\sqrt{2}\cdot\frac{\sqrt{2}}{2}=0$$ At this point we already have the magnitude and direction of the resultant force. We need the point of application. My...

We have The torque about the origin is $$\vec{\tau}=(aA-bB)\hat{k}\tag{1}$$ The resultant force is $$\vec{F}_R=B\hat{i}+A\hat{j}\tag{2}$$ At this point, all I did was compute $$|\vec{r}\times\vec{F}_R|=|\vec{r}||\vec{F}_R|\sin{\theta}=l|\vec{F}_R|=|\vec{\tau}|\tag{3}$$ which led to...

EDIT: I forgot about Second Newton's law for rotations and this led to a mistake. Anyway, thanks for the people who answered it and remembered me about law of inertia. I was thinking about how to "make" things to move without rotate the object, then i tried to calculate the minimum force to...

Was surprised by a study recently where we tested 6 samples for pull-off force at a 10% reduction in clamp Torque and noticed negligible shift in results. Is it possible that at higher torque the clamp is deforming the pipe, reducing the surface contact (friction) between the hose and pipe? The...

A torque meter with a triangular slab extension is inserted into a corresponding triangular slot. The C-shaped arm features a V-shaped dent on which a roller is seated. This roller is held in compression by a spring. The roller's positions are labeled '0' for the initial state and '1' for the...

The following images contain the question as well as my solution. I am not sure whether my solution is correct or not. Please help.

I can derive it for a circular loop: $$dF=BI\sin\phi\ dl=BIr\sin\phi\ d\phi$$ Torque on quarter circle when field is parallel to plane of loop=$$\tau=\int^{(\pi/2)}_0 BI \ dl \sin\phi (r\sin\phi)$$$$=\int^{(\pi/2)}_0 BIr^2 \sin^2\phi\ d\phi$$ Net torque=##4\tau=BIA## If magnetic field is at any...

In the given solution, it states that F_3f(a)=F_2f(a+b) is a "reasonable assumption". However, I don't see how we can just assume that. I can very clearly see that F_i for i=1,2,3 is likely proportional to a and b in some kind of way, but I can not clearly establish a line of reasoning for this...

I am trying to obtain the expression for the potential transmission of torque using friction. I could derive the formula assuming constant pressure between planar surfaces. To have it in LATEX so it is easier to read, this is the expression for the torque transmission using friction...

Hi, I am trying to figure out the torque experienced by an alternator to plug into the swing equation. I am not sure how to exactly model the alternator for that. With my current approach, I only get confused. My idea is to model the alternator as a AC power source with fixed frequency in...

Let the left string be T1 and the right string be T2. Pretend that the masses are NOT equal and that the total mass on the left is 3mg and the total mass on the right is 2mg. My first thought: Net torque = 3mgR1-2mgR1 Actual solution: Net torque = (T1-T2)*R Once again, the force that's used...

The solution lists out mg(b/2)=ma(h/2) and then proceeds to solve for a. I am a bit stuck on how the initial equation is listed - why is the (b/2) swapped with the (h/2)? (namely, why isn't the equation mg(h/2)=ma(b/2)? My logic for this is y-direction and x-direction ) I feel that I am missing...

In deriving the ##k_{net}## of the given system, it is taken that the extension produced by both springs is equal but their force is different. Therefore ##(k_1+k_2)x=k_{net}x \implies k_1+k_2=k_{net}##. In absence of pivot, an object rotates around an axis through COM and perpendicular to...

I am trying to size the two motors needed for a robot arm I'm building. The first motor, which I call the wrist motor, drives a pulley on a fixed axis that connects to a second pulley (of the same size) which is attached to a hand and load. I can calculate the moment of inertia for the hand and...

Torque_left = 100 kg * 1 m = 100 kg·m Torque_right = 200 kg * (13 - x) m = 200(13 - x) kg·m 100 kg·m = 200(13 - x) kg·m 100 = 200(13 - x) x = 12.5 meters pivot = 12.5 m

TL;DR Summary: I'm stuck trying to find the equation for time period T of a physical pendulum without any calculus using torque. Hello all. I am currently writing my IB Physics HL IA (high school physics lab report). I am investigating the effect of length on the time period of a uniform rod...

Hey Guys, I'm looking for any help in determining what the estimated torque would be on our mixer. If you know of someone that can help with this please let me know and maybe forward this to them. We are looking for a device (strain gauge) that can display this and we will need to know...