Explore BrainMass
Share

# Torques

### Find the Tension in the Right Cable

See the diagram in the attached file. A window washer with a mass of 63.0 kg stands a distance, D = 0.800 m, from the left end of a plank of length, L= 1.90 m, with a mass of 17.0 kg. The plank is hung on two cables as shown. Find T2, the tension in the right cable.

### Two People Carrying a Mass Along an Inclined

Assume that W = 1.80 m, L = 3.30 m, angle = 21.0°, and that the weight of the mass is 39.90kg. What is the (vertical) weight carried by the builder at the rear? How do I set up the problem??

### A Beam on Wall

A 30.8 kg beam is attached to a wall with a hinge and its far end is supported by a cable. The angle between the beam and the cable is 90o. If the beam is inclined at an angle of q = 24.5o with respect to horizontal, what is the horizontal component of the force exerted by the hinge on the beam? (Use the `to the right' as + for

### Rotational Motion: Wheel is pulled on a curb.

(See attached file for full problem description with diagram and values) --- You are trying to raise a bicycle wheel of mass and radius up over a curb of height . To do this, you apply a horizontal force . 1. What is the least magnitude of the force that will succeed in raising the wheel onto the curb when the

### Zero Net Torque Conditions

Please see attachment for torque diagrams. Each of the four bars shown can rotate freely in the horizontal plane about its left end. For which diagrams is the net torque equal to zero?

### A rope is wrapped around a wooden cylinder that turns on a metal axle. A crate is suspended from the free end of the rope. One end of the axle pivots on frictionless bearings; a crank handle is attached to the other end. When the crank is turned, the end of the handle rotates about the axle in a vertical circle, the cylinder turns, and the crate is raised. To determine magnitude of the force applied tangentially to the rotating crank.

The mechanism shown in the figure (see attachment) is used to raise a crate of supplies from a ship's hold. The crate has total mass 56 kg . A rope is wrapped around a wooden cylinder that turns on a metal axle. The cylinder has radius 0.310 m and a moment of inertia = 2.40 kgm^2 about the axle. The crate is suspended from

### Forces and are applied tangentially to a wheel with radius 0.330 m,

Forces and are applied tangentially to a wheel with radius 0.330 m, as shown in the figure . See attachment for diagram and figures. What is the net torque on the wheel due to these two forces for an axis perpendicular to the wheel and passing through its center?

### Angular Speed of System

A uniform rod of mass m_1 and length L rotates in a horizontal plane about a fixed axis through its center and perpendicular to the rod. Two small rings, each with mass m_2, are mounted so that they can slide along the rod. They are initially held by catches at positions a distance r on each side from the center of the rod, and

### Torque and moments of force

Calculate F1 for the beam shown in figure below. Assume it is uniform and has a mass of 240 kg. For the distances assume that D1 = 1.86 m, D2 = 3.96 m, D3 = 2.82 m and D4 = 1.02 m. For the forces assume that f3 = 3940 N, f4 = 3140 N and f5 = 2100 N.

### Friction: Condition for Slipping or Toppling

A cube of side L = 1.40 m rests on a rough floor. It is subjected to a steady horizontal pull, F, exerted a distance h = 0.82 m above the floor as shown in figure below. As F is increased, the block will either begin to slide, or begin to tip over. What must be the coefficient of static friction μs so that the block begins to s

### Torque and potential energy in a current carrying coil

4) A circular coil with area A and N turn is free to rotate about a diameter that coincides with the x-axis. Current I is circulating in the coil. There is a uniform magnetic field B in the positive y-direction. Calculate the magnitude and direction of torque and the value of the potential energy U, as given in the equation; "U

### For and troque acting on a current carrying coil

3. A rectangular coil of wire, 22.0 cm by 35.0 cm and carrying a current 1.40 A, is oriented with the plane of its loop perpendicular to a uniform 1.50 T magnetic field as shown below. a) Calculate the net force and torque which the magnetic field exerts on the coil. b) The coil is rotated through a 30.0º angle about the axis

### Shear Stress Problem for Pitch Circle Diameter

Shear stress problem -------------------------------------------------------------------------------- My answer to question 5 is wrong, can you correct? PCD = pitch circle diameter Factor of safety = ultimate tensile stress / safe working stress

### Torque and angular acceleration

Find the mass of a uniform solid cylinder which is mounted so that it can rotate freely (i.e., without friction) about a fixed axis that passes through its center and runs along the length of the cylinder. This is not a simple project because for one thing, that cylinder is heavy! Also you don't want to risk removing the heavy c

### Angular Acceleration of a Roller

A roller is rolled by pulling on a rope wrapped around an inner groove, as shown in attachment. If the roller rolls without slipping, the angular acceleration in rad/sec^2 of the roller is what? (See attached file for full problem description)

### Circular Frequency of a Rod

A slender rod is pivoted at 0 which is a frictionless bearing. The circular frequency in rad/s at the rod for a small oscillation is? (See attached file for full problem description)

### Physics Problem - A uniform, hollow, cylindrical spool

Please help with the following classical mechanics problem. See attached file for full problem description. --- A uniform, hollow, cylindrical spool has inside radius R/2, outside radius R and mass M as in the attached .jpg. It is mounted so that it rotates on a fixed horizontal axle. A counterweight of mass m is connecte

### Motor Torques

Q1) Assume the torque stays constant at 120 N-m. How long will it take for the unloaded armature to accelerate from zero up to full speed of 3000 rpm? Now I am given the formular Ix = I w-wo / t. All I know is that the rotational inertia is 2.81 kg-m^2. Q2) What will be the power of the motor when it is s

### Circular Motion of a Particle

A particle of motion is moving in such a way that its position at time t is given by (t^3-3t, 4t^2, 5t).... See the attached file.

### Dipole Moments

Please show all work and show all equations used so I can understand completely. 1) A uniform electric field of 300N/C makes an angle of 25 degrees with the dipole moment of an electric dipole. If the torque exerted by the field has a magnitude of 2.5*10^-7N.m, the dipole moment must be ___? 2) The dipole moment of a dip

### Solving a Rigid Body Problem Using Newton's Second Law of Motion

See the attached file. A car has a mass of 1.4 tonnes. The distance between the front and rear wheel axles is 3.6m and the centre of mass is positioned 1.5m behind the front wheel centre and 0.8m above the road level. These details are attached in Figure Q1. The car, initially traveling at 12.6km/h, is accelerated up a stra

### Circuit analysis and efficiency

A fully loaded 440V, three phase motor draws 12.4A at 86% power factor (pf). Its speed is 1730 rpm and its torque output to a mechanical load is 29.1 lb-ft*1.356=39.5Nm. What is the output HP and the efficiency?

### Power Screws

A power square thread screw has a pitch diameter (dm) of 34mm, the lead of the screw 1 of 4mm, the frictional diameter of the collar (dc) of 40mm. The coefficients of friction are f=0.08 for the threads and fc=0.05 for the collar. the vertical load F per screw is 5 kN. How do I find the torque required to raise the load?

### Free Body Diagram of a Crane

In the crane shown in the figure, the member BG weighs 600lb, which is considered to act midway between B and F. If other weights of members are neglected, what will be the forces in the two tension rods? What will be the horizontal and vertical components of the reactions at A and B? Please see attached.

### Physics - Static Structures - Crane and Tripod - Find the Forces

In the crane shown in Fig. Prob. 4-11 in the textbook, the member BG weighs 600 lb, which is considered to act midway between B and F. If other weights of members are neglected, what will be the forces in the two tension rods? What will be the horizontal and vertical components of the reactions at A and B? Figure Problem 5

### Solve: Computing the Torque

A force of 30N is applied perpendicularly to the face of a door at a distance of 1.5 m from the hinge of the door. Find the torque on the door about its hinge: a. 20 n/m b. 2nm c. 45Nm d. 20Nm

### Solving for Angular Acceleration

Question: F=1 N and the length of the rod is L=1m. Find the angular acceleration when theta=0, 45, and 90 degrees. (I=1/12mL^2) m=1 kg

### Pressure problem

A hydraulic press for compacting powdered samples has a large cylinder which is x = 11.8 cm in diameter, and a small cylinder with a diameter of y = 1.96 cm (see figure). A lever is attached to the small cylinder as shown. The sample which is placed on the large cylinder, has an area of 4.09 cm2. What is the pressure on th

### A pressure problem using different areas

A hydraulic press for compacting powdered samples has a large cylinder which is x = 11.8 cm in diameter, and a small cylinder with a diameter of y = 1.96 cm (see figure). A lever is attached to the small cylinder as shown. The sample which is placed on the large cylinder, has an area of 4.09 cm2. What is the pressure on the