A boat exerts a pull of 4000 N on its hawser which is wrapped about a capstan on the dock. If the coefficient of friction is 0.3, how many turns must the hawser make around the capstan so that the pull at the other end does not exceed 50 N?

When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm with hand is 1.80 kg. If the biceps is connected to the forearm a distance of 2.50 cm from the elbow, what is the magnitude of the torque exerted by the biceps to hold a 44.5 N (about 10 lbs) ball at the end of the forearm at distance of 35.0 cm from the elbow, with the forearm parallel to the floor, in N-m? Use g = 10.0 m/s². Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. driceps Biceps dall >

A sphere of mass 5 kg and a block of mass m2 =3 kg are connected by a light cord that passes over a pulley as shown in Figure. The radius of the pulley is R=20 cm, and the mass of the thin rim is 1 kg. The spokes of the pulley have negligible mass. The block slides on a horizontal surface. The kinetic coefficient of friction between block and horizontal surface is 0.1 Find for the linear acceleration of the two objects,

A bridge of length 50.0 m and mass 8.10 x 104 kg is supported on a smooth pier at each end as shown in the figure below. A truck of mass 2.80 x 104 kg is located 15.0 m from one end. What are the forces on the bridge at the points of support? 15.0 m 50.0 m normal force at point A N normal force at point B

John is pushing his daughter Rachel in a wheelbarrow when it is stopped by a brick 8.00 cm high (see the figure below). The handles make an angle of 0 = 20.0° with the ground. Due to the weight of Rachel and the wheelbarrow, a downward force of 407 N is exerted at the center of the wheel, which has a radius of 18.0 cm. Assume the brick remains fixed and does not slide along the ground. Also assume the force applied by John is directed exactly toward the center of the wheel. (Choose the positive x-axis to be pointing to the right.) & (a) What force (in N) must John apply along the handles to just start the wheel over the brick? 1690.53 X Your response differs from the correct answer by more than 10%. Double check your calculations. N (b) What is the force (magnitude in kN and direction in degrees clockwise from the -x-axis) that the brick exerts on the wheel just as the wheel begins to lift over the brick? magnitude KN direction ° clockwise from the -x-axis

If the distance h is 1.52 m , what is the vertical component of the force exerted on the wheel A by the track?               If the distance h is 1.52 m , what is the vertical component of the force exerted on the wheel B by the track?          Find the maximum value h can have without causing one wheel to leave the track.      Thank you!

A model airplane with mass 0.750-kg is tethered by a wire so that it flies in a circle of radius 30.0-m. The airplane engine provides a force of 0.800-N perpendicular to the tethering wire. (Consider the airplane to be a point mass) (a) Find the torque that the net thrust produces about the center of the circle.   Answers: (a) 24.0 N m

.) The figure shows a vertical force applied tangentially to a uniform cylinder of weight F. The coefficient of static friction between the cylinder P and all surfaces is 0.500. The force P is increased in magnitude until the cylinder begins to rotate. In terms of F, find the maximum force magnitude P that can be applied without causing the cylinder to rotate. Suggestion: show that both friction forces will be at their maximum values when the cylinder is on the verge of slipping.

There is this ladder with a length L = 3.5 m and mass M= 15 kg leans against a smooth vertical wall, while its bottom legs rest on a rough horizontal floor. There is also static friction between floor and ladder is u = 0.47. The ladder makes an angle 0 = 55° with respect to the floor. A person of mass 8M stands on the ladder a distance d from its base. What is the magnitude of the normal force N, in newtons, exerted by the floor on the ladder? What is the largest distance up the ladder dmax, in meters, that the person can stand without the ladder slipping?

Problem 1: Consider a small block weighing 200 grams that is placed 10 cm from the center of turntable. The turntable slowly begins to spin. If the static friction coefficient is g = 0.4, at what angular velocity will the block begin sliding off the turntable?