Torque Definition and 1000 Threads

Homework Statement A 250V shunt dc motor runs at 1000rpm while taking a current of 25 A. The motor has armature and field resistance as 0.2W and 250W respectively. Calculate (a) The speed when the load current is 50A. (b) Armature torque developed at both speeds. Homework Equations...

Hi, I'm having trouble understanding this attached example in my physics textbook. It notes torque as being positive when substituted back into mg-Ft=-ma rather than being negative which I would think it would be because it is going in the clockwise direction. Can anyone help me understand why...

Could anyone please help me with these problems on my biomechanics assignment? I hate asking for them to just be done for me, but I am frankly clueless given that we didn't cover torque in class yet are somehow expected to know it. Any help is appreciated, thanks!

Homework Statement You have one meter stick that weights 100g. Calculate the torgue on the stick at 20 cm mark for A. whole stick weight when the center is at 50cm B. the left and right weight of the stick are separate, "with their masses located at the halfway points between the 20cm mark and...

Hello, I would like to know the basic eqns in a simple Powertrain model. Where i have the Desired accelaration and the other quantities to calculate the tractive force. But i need to calculate the torque to the wheels. can anyone help me ?

Homework Statement Homework Equations work-kinetic energy theorem The Attempt at a Solution

Question The Hubble Space Telescope is stabilized to within an angle of about 2 millionths of a degree by means of a series of gyroscopes that spin at 1.92×104 rpm . Although the structure of these gyroscopes is actually quite complex, we can model each of the gyroscopes as a thin-walled...

Homework Statement Homework Equations Torque and Newton's 2nd Law Equations The Attempt at a Solution Apart from drawing a free-body diagram, I couldn't do much else. I can't seem to find the source of torque causing the car to rotate clockwise about its pivot (i defined it as the right...

I was trying to figure out the velocity a 6mm diameter shaft would spin given a torque of 4000 N-mm. M =mass = .0227 Kg R=radius = .003 i=moment of inertia = 1/2*MR^2 = 1.04E-7 T/R=Force = 1300N <---Am I correct that this is force experienced by shaft? Bearing friction coefficient = .0015 iX''...

Homework Statement A human holds a ball of mass 8kg at his hand, so that the forearm is perpendicular to the upperarm. The distance between the elbow and the center of mass of the forearm is 0.15 meters, the distance between the elbow and the muscle is 0.05 meters and the mass of the forearm...

Homework Statement We had this elementary experiment in class. An aluminium rod is fixed at one end and at the other end you have a disk. You hand increasingly heavy weights on the disk and measure how much the rod shears (twists). We were asked to make a graph of the shear torque vs. angle of...

Homework Statement A horizontal pole is made of 8 pieces, 1 meter apart each. Forces that do not act at the ends are shown in the picture. The pole does not rotate, and weighs 20N. a. What is the sum of forces applied on the pole? b. Where is it applied? c. What are the forces at the ends...

Homework Statement A uniform thin rod of Length L and mass M is pivoted at one end is held horizontally and then released from rest. Assuming the pivot to be frictionless, find a) Angular velocity of the rod when it reaches its vertical position b) The force exerted by the pivot at this time...

Homework Statement Find the angle Theta so that the system is in equilibrium Mass of each block: 2 Kg Mass of ring: 4π Kg Homework Equations Static equilibrium: Rotational equilibrium The Attempt at a Solution Static equilibrium: 2g + 2g + 4πg = Normal N = 4g + 4πg Taking...

Homework Statement Assume no friction for 1 - 6 1. Draw a free body diagram of the fly wheel (from above), and a free body diagram of the weight (from side). 2. What force appears in both diagrams? 3. What is the relationship between the torque on the flywheel and the tension in the string...

Homework Statement Starting from the Lorentz force law, in the form of Fmag = ∫ I (d× B), show that the torque on any steady current distribution (not just a square loop) in a uniform field B is m × B. Homework Equations I looked at the solution I found in this thread here, but I don't...

What direction would torque be on a trebuchet in motion at the point where the swing arm is parallel to the ground?

Hello Anyone, Could you help me in finding the torque req. for a cap to leak proof? My cap (polyproplene) which dia. was 32mm and its detail specs are, thread major dia.- 28.5mm, min. dia. - 26mm, pitch - 3mm, thread angle-45deg which has a EPDM rubber seal placed inside (outer dia 26.5mm &...

Homework Statement The maximum torque on a lever is 1.5 x 10^6 Newtons. How many people of weight 750N can stand evenly spaced on this lever, which has a length of 20 meters? Homework Equations T=FR Weight=mg W=Fd X = Number of people The Attempt at a Solution I have set 1.5x10^6 N =...

If you spin up a flywheel by applying torque somewhere else on its axle, you are transferring energy along the axle from the point where the torque is being applied to the flywheel, which effectively adds to the mass of the flywheel. This means rather counter-intuitively that a tiny force has...

Homework Statement When a wood shelf of mass 7.7 kg is fastened inside a slot in a vertical support as shown in (Figure 1) , the support exerts a torque on the shelf. Assume that the slot exerts two vertical forces on the shelf, at points A and B. Determine the force exerted on the shelf by...

Homework Statement http://imgur.com/koz4PpI Homework EquationsThe Attempt at a Solution I was able to calculate the net torque on the pulley as 55.88 and the Inertia as .352. Those could be wrong, but that's as far as I could get. I really have no idea. Any kind of help/explanation would be...

What formula can I use to calculate the force I need to apply to a sliding arm that makes a point contact along the edge of a rotating arm attached to a shaft driving a load in order to push the rotating arm to rotate the shaft? The rotating arm is 1 cm wide. The load at the shaft is 1 Nm...

1. Homework Statement The door has a mass of 30 kg, is 200 cm long and 90 cm wide. The hinges are installed at 25 cm from the bottom (R2) and 25 cm from the top (R1). What are is the magnitude of the force exerted by each hinge on the door? The door is in a state of static equilibrium...

I have recently learned that in order to vary torque output from a DC motor, I need to vary the input current. A project I am working on requires that I have a DC motor that will be backdriven while providing resistance to a lever. A max torque of about 10 lbft will be provided from the lever...

Here's the question that I mentioned in my introduction: If anyone can give me the answer, please keep it very simple - I was never any good at physics or higher math. It's very easy and only requires a claw-hammer to do. Very low tech. Hold the hammer at the end of the handle with the claw...

Homework Statement A cylinder having a mass of 5.0 kg can rotate about its central axis through point O. Forces are applied as shown in the figure: F1 = 5.0 N, F2 = 6.0 N, F3 = 2.5 N, and F4 = 5.5 N. Also, R1 = 6.5 cm and R2 = 12.0 cm. Find the magnitude and direction of the angular...

Hi How can I measure, shaft power (watts or HP) of a vertical turbine using dead weight blocks Turbine diameter - 18 inches RPM - 450 ( Zero Load)

Hey there! I would really appreciate if someone could help me with the following problem. I didn't find it anywhere (textbooks, web...). Not only currents but also magnetized bodies possesses magnetic moment. I know that if the magnetized body is at rest in a constant external magnetic field...

I'm confused when it comes to the rotational version of Newton's Second Law: τ = Iα Is the torque τ the same thing as the moment of a force? I'm not sure if there is a discrepancy between British and American schools but I was always taught that a torque was a special case of moments and is...

I have a triangular sign, each face is 9000mm long horizontal, 2616mm high vertically, the "turntable /bearing "diameter is 3450 mm, the longest length from the sign edge is 5100mm from the centre shaft, the deadweight of the structure is 3200kg, i want to turn at 0,6 RPM, what torque shoul my...

Homework Statement a spool of radius R1 and R2 (R2>R1) is kept on hortizontal surface. A force f= 2t N (where t is time ) acts on the inner radius tagentially find the angular momentum of the system about the bottomost point of the spool. Homework Equations v=u+at W=Wi+alpha(t) L=IW+mvrThe...

Homework Statement Regarding part (c) (i), as we know that we can consider any of the convenient point as our pivot. If I consider the point where the 5kg mass (center of mass of the bag) acts, the asnwer turns out to be wrong. The correct answer has 4kg mass as pivot Homework Equations...

When we say torque about a point what axis do we mean,how can rotational motion happen without an axis?

I know that to calculate the torque about an axis, we can choose any point on that axis and find the torque about that point and take the component along the direction of the axis.Buy what is the proof behind this theorem?

I have been trying to figure out the starting torque needed to start rotating a pipe and valve in a weld fixture. The pipe is 304 stainless 24 inches outside diameter and has an inside diameter of 23.625 inches. The length of pipe varies but so far all of the lengths of pipe get a valve welded...

1. Homework Equations // Tension of the spring // Where sinL between `bottom right` of the spring and the bar Ft = sinL * kx // Where x0 is the initial length of the spring Ft = sinL * k(x - x0) // Force of gravity Fg = -mg // Find x0 // sqr = square root x0 = sqr(100^2 + 100^2) //...

I'd like to make a small shop press from an electric motor, say 18'' tall max, with 6" of travel. It should be able to press say 10,000 psi and hold for several second or even maybe indefinitely. My question is two fold. First, what type of mechanical action would be best to turn circular...

Homework Statement [/B] Determine the moment about point B of each of the three forces acting on the beam. Homework Equations M = F*d⊥ The Attempt at a Solution I went and found the components for each of the forces. Please double check it if I did them right: F1 : Fx = 0 Fy = 375 lb F2: Fx...

Homework Statement An electric dipole consists of +/- Q = 330nC separated by a distance of 1200nm. The dipole is initially oriented in the -i direction (along the negative x axis). The dipole is in a uniform external electric field of E=2500j N/C Determine the following: a) The magnitude of...

Hello! I'm posting this because I cannot find this type of question and analysis anywhere! What are the force and torque equations describing the following? 1. A thin metal wire is bent around the OD of a cylindrical tube (wall thickness, t) perpendicular to the axis. 2. The cylindrical tube is...

So I'm working on a senior design project and was trying to use a DC motor to charge a battery. The point is to allow for quick use to charge a phone or a laptop in circumstances where you need a quick charge. We have lead-acid batteries connected in series and parallel to give us: 14,000mAh...

Hi I'm working on a project out in the North Sea on an oil rig, we need to remove a hydraulic cylinder from a crane, I have attached a drawing the red cylinder B needs to be removed. To do this we will move the crane boom to the position shown by the orange lines and rest the end down on the...

I found the following problem on the 2009 F = ma exam. 24. A uniform rectangular wood block of mass M, with length b and height a, rests on an incline. The incline and the wood block have a coefficient of static friction, μs. The incline is moved upwards from an angle of zero through an angle...

how can a rectangular coil placed in uniform magnetic field have torque? Isn't torque the force on an object while its rotating? Will the coil rotate in a magnetic field? I don't understand.

Hi Guys, I have a simple annulus of radius 25mm and 15mm of length 50mm where i applieD a torque of T=100000Nmm. Its inertia about its main axis is I=124.9 kgmm2. Therefore i expect the acceleration to be T/I. Its not clear how to confirm this answer in Msc Adams because when i set simulation...

Homework Statement As the title states, the goal of this problem is to determine the weight of an object based on the torque caused by a force applied to it. The object in question is a wheelbarrow, and the force applied is a person lifting it by the handle using 100N with an angle of -30°...

Hi there, I have a motor peak torque, peak power, peak speed, rated torque, rated power, rated speed, torque at max speed. I was able to produce the peak torque curve. But, i don't understand how to create this continuous torque curve here. I have attach a link here, and somehow the continuous...

Homework Statement Imagine a uniform, symmetric rod, free to rotate around an axis going into the computer screen through the center of the rod. Now say that we start off the rod so that it is not horizontal or vertical, but somewhere in between. My intuition tells me that the rod will start...

This was a pulley question that was presented to me today at work. They are using two pulleys, one is driven by a gearbox, the other is sort of an idler, between the two pulleys there is a total of 6 wraps. They are trying to pull a 8000lb cart up and down a straight incline of 5 degrees over...