e length of a bicycle pedal arm is 0.137 m, and a downward force of 126 N is applied to the pedal by the rider. What is the magnitude the torque about the pedal arm's pivot when the arm is at an angle of (a)37.2°, (b) 90°, and (c) 180° with the vertical?

A gardener is using a tool as shown in the figure to pull weeds. You will notice that the tool is designed with a built in pivot point about which the torques are applied. If the gardener applies a 3.04-N · m torque (about the pivot point) in order to pull a weed, determine the resistive force the weed exerts on the weed puller. N 24 cm 6.0 cm

A worker opens a 1.50 m wide door by pushing on it with a force of 39.5 N directed perpendicular to its surface. ENT (a) What magnitude torque (in N. m) does she apply about an axis through the hinges if the force is applied at the center of the door? N.m (b) What magnitude torque (in N. m) does she apply at the edge farthest from the hinges? N. m

Force F2 acts half as far from the pivot as F1. What magnitude of F2 causes the net torque on the rod to be zero?

A uniform rod is set up so that it can rotate about an axis at perpendicular to one of its ends. The length and mass of the rod are 0.701 m and 1.29 kg , respectively. A force of constant magnitude ?F acts on the rod at the end opposite the rotation axis. The direction of the force is perpendicular to both the rod's length and the rotation axis. Calculate the value of ?F that will accelerate the rod from rest to an angular speed of 6.59 rad/s in 8.95 s.

A solid cylindrical disk has a radius of 0.12 m. It is mounted to an axle that is perpendicular to the circular end of the disk at its center. When a 40-N force is applied tangentially to the disk, perpendicular to the radius, the disk acquires an angular acceleration of 100 rad/s2. What is the mass of the disk?  kg

A circular disk with a radius of 0.38 m is subject to 2 tangentially applied forces. The disc is fixed such that it will rotate about its center. Both forces produce a torque in the same direction. F1 = 3.5 N applied at the outer edge of the disc. F2 = 3.2 N applied at a distance of 0.28 from the center of the disc. What is the net torque on the disc?

A uniform, 267 N rod that is 2.06 mm long carries a 225 N weight at its right end and an unknown weight WW toward the left end (see the figure below). When WW is placed 55.9 cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 74.7 cm from the right end. a. What is w (in N)? b. If the weight w is moved 25.3 cm to the right, how far must the fulcrum (balance point) be moved to restore balance? 225 N Figure 1. A mass rests on the left side of a balance beam.

The wheel and axle have forces applies tangentially as shown in the figure. There is also a frictional torque of 0.02 Nxm on the wheel, once the wheel starts moving. The radius of the axel is 20 cm and the radius of the wheelis 60 cm and F1 = 2.4 N, F2 = 3.0 N and F3 = 1.2 N. a. Calculate the net torque on the moving wheel due to the applied forces F1 F2 and F3. b. What direction of rotation would the applied forces cause? Explain. c. What is the direction of frictional torque? Explain. d. Calculate the net torque on the wheel and axle.

A wheel with thin spokes can be considered a hoop, where I=mr. A bicycle wheel has a mass of .35 kg with a radius of .30 m and is spinning at 25 rad/s in the positive direction. Brakes apply a force of friction of 15 N at the rim. We will consider the rim of the wheel to be on the very outside of the wheel. (Remember significant digits.) a.) What is the direction of the torque provided by the brakes (positive or negative) b.) What is the magnitude of the torque applied by the brakes? Nm c.) What is the moment of angular inertia of the wheel? kgm2 d.) What is the angular acceleration of the wheel? rad/s? e.) How far does the wheel travel (in radians) before coming to rest? rad f.) How long does this take? s g.) With faulty brakes, only 8 N can be applied. How long would it take to stop the wheel under these conditions? s MacBook Pro