The figure shows an arrangement in which four disks are suspended by cords. The longer, top cord loops over a frictionless pulley and pulls with a force of magnitude 86.2 N on the wall to which it is attached. The tensions in the shorter cords are T₁ = 60.1 N, T₂ = 33.1 N, and T3 = 8.21 N. What are the masses of (a) disk A, (b) disk B, (c) disk C, and (d) disk D? T₂

A car traveling on a flat (unbanked), circular track accelerates uniformly from rest with a tangential acceleration of 1.75 m/s. The car makes it one quarter of the way around the circle before it skids off the track. From these data, determine the coefficient of static friction between the car and track. 0.56 You appear to have forgotten that the static force of friction is also responsible for the tangential acceleration of the car.

6.3 A (solid) spool of mass M and radius R is supported by an axis about which it can rotate freely. A piece of thread is rolled around the spool, and a mass m = (where B is some positive number) tied to the end of the thread. What will be the mass m's speed v after it has descended a distance h, starting from rest? Express your result in terms of g, h and B. = BM M

What? This problem again? Not exactly. A block with mass m,ị = 3.00 kg sits on a horizontal table and is attached to a rope. The rope then passes over a MASSIVE pulley this time and is attached to a block of mass m2 = 2.00 kg, which hangs vertically (see picture). The coefficient of kinetic friction of the interface between the table and m, is 0.1. You may assume the pulley section is a disk with a mass of 2 kg. We will keep the pulley frictionless for brevity. Ideal disk pulley with mass Find the acceleration of the blocks using your choice of either Newton's Laws or the energy conservation method. Yes, I can actually read your minds from here; of 2 kg and the answer is no, you do not need the radius of the pulley.

A horizontal circular platform rotates counterclockwise about its axis at the rate of 0.827 rad/s. You, with a mass of 74.5 kg,walk clockwise around the platform along its edge at the speed of 1.13 m/s with respect to the platform. Your 20.5 kg poodle also walks clockwise around the platform, but along a circle at half the platform's radius and at half your linear speed with respect to the platform. Your 18.7 kg mutt, on the other hand, sits still on the platform at a position that is 3/4 of the platform's radius from the center. Model the platform as a uniform disk with mass 90.9 kg and radius 1.87 m. Calculate the total angular momentum of the system.

You have a grindstone (a disk) that is 212.44 kg, has a 0.185-m radius, and is turning at 47.44 rpm, and you press a steel axe against it with a radial force of 36.043 N. Assuming the kinetic coefficient of friction between steel and stone is 0.193. How many turns will the stone make before coming to rest?

A 4.00 kg mass is attached to a vertical rod by the means of two 1.25 m strings which are 2.00 m apart. The mass rotates about the vertical shaft producing a tension of 80.0 N in the top string. (a) What is the tension on the lower string? (b) How many revolutions per minute does the system make?

At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 2.72 m/s, and an 82.0-kg person feels a 276-N force pressing against his back. What is the radius of a chamber?

A certain amusement park ride consists of a large rotating cylinder of radius R = 3.15 m. As the cylinder spins, riders inside feel themselves pressed against the wall. If the cylinder rotates fast enough, the frictional force between the riders and the wall can be great enough to hold the riders in place as the floor drops out from under them. If the cylinder makes f 0.590 rotations/s, what is the magnitude of the normal force FN between a rider and the wall, expressed in terms of the rider's weight W? FN = W What is the minimum coefficient of static friction u, required between the rider and the wall in order for the rider to be held in place without sliding down? Hs 2

A car with mass m = 1000 kg completes a turn of radius r = 550 m at a constant speed of v = 21 m/s. As the car goes around the turn, the tires are on the verge of slipping. Assume that the turn is on a level road, i.e. the road is not banked at an angle. What is the numeric value of the coefficient of static friction, μs, between the road and tires?