4.0 kg 1.0 m |2.0 kg
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The two blocks in the figure(Figure 1) are connected by a massless rope that passes over a pulley. The pulley is 17 cm in diameter and has a mass of 2.1 kg . As the pulley turns, friction at the axle exerts a torque of magnitude 0.46 N⋅m .
If the blocks are released from rest, how long does it take the 4.0 kgkg block to reach the floor?
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- An Atwood’s machine consists of blocks of masses m1 = 10.0 kg and m2 = 20.0 kg attached by a cord running over a pulley as in Figure P8.40. The pulley is a solid cylinder with mass M = 8.00 kg and radius r = 0.200 m. The block of mass m2 is allowed to drop, and the cord turns the pulley without slipping. (a) Why must the tension T 2 be greater than the tension T1 ? (b) What is the acceleration of the system, assuming the pulley axis is frictionless? (c) Find the tensions T1 and T2 .20kg mass is at the 1.25 meter mark. Package G is at 1 meter mark. What must the mass of object G be? Calculate the torque that each object creates. The 20 kg mass on the left creates a positive torque. If the system is in equilibrium, the magnitude of the torque on the right must equal the magnitude of the torque on the left.A grinder consists of a 5.34 kg steel block on a 1.87 m long arm that spins around a table. If the angular acceleration is -1.02 rads/s2, what is the coefficient of friction between the steel block and the table?
- You have a horizontal grindstone (a disk) that is 88 kg, has a 0.31 m radius, is turning at 89 rpm (in the positive direction), and you press a steel axe against the edge with a force of 17 N in the radial direction. Assuming that the kinetic coefficient of friction between steel and stone is 0.20, calculate the angular acceleration of the grindstone in rad/s2. What is the number of turns, N, that the stone will make before coming to rest?June started winding up her arm holding a baseball, moving it around her shoulder in a circle, to get ready to throw. June’s arm is 0.5 m long and moves at an angular velocity of 2 rad/s. How much time will 10 revolutions take? What is the velocity of the baseball when she let go of it?a meterstick is balanced at the 60.0 cm mark on a fulcrum. A 63.0 gram object is hung from the 10.0 cm mark and a 150 gram object is hung from the 95.0 cm mark. IF the meterstick is in balance and horizontal, what is the mass of the meterstick? What is the total counter-clockwise torque? WHat is the clockwize torque?
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- A circular disk with a radius of 0.37 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 = 4.7 N applied at the outer edge of the disc. F2 = 3.2 N applied at a distance of 0.3 from the center of the disc. What is the net torque on the disc?A circular disk with a radius of 0.42 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 = 4.4 N applied at the outer edge of the disc. F2 = 3 N applied at a distance of 0.2 from the center of the disc. What is the net torque on the disc?The two blocks in (Figure 1) are connected by a massless rope that passes over a pulley. The pulley is 16 cm in diameter and has a mass of 2.7 kg. As the pulley turns, friction at the axle exerts a torque of magnitude 0.75 Nm. If the blocks are released from rest, how long does it take the 4.0 kg block to reach the floor?