Please help with 21-25

8:52 disk with mass m and radius b. It rolls down 3 vertically as indicated in the sketch. 2 6. T = -mg 7 of 10 7. T = - 1 kolsawala (afk472) - 4-PHY317K-Homework - lang - (57345) 020 (part 3 of 3) 10.0 points Determine the descending speed up of its cen- 022 10.0 points ter, after the disk has dropped for a height A rod of negligible mass is pivoted at a point h. that is off-center, so that length 41 is different from length 62. The figures show two cases in 1. vp = Vagh which masses are suspended from the ends of the rod. In each case the unknown mass m is balanced so that the rod remains horizontal. 2. Up = Vagh 12 3. up = Vgh 65 kg 4. vp = V2gh 5. UP = Vagh 62 kg m 6. UP = Vagh What is the value of m? 7. UP = V2gh 1. 29.9333 Vegh 2. 45.9565 3. 41.9524 4. 40.4722 5. 46.4327 021 10.0 points 6. 26.9815 When a spinning bike wheel is placed hor- 7. 35.4119 izontally, hung from a pivot at one end, the 8. 24.98 axis of rotation of the wheel will swing in a 9. 60.4814 horizontal circle. 10. 63.4823 023 10.0 points A wheel of radius R and negligible mass is mounted on a horizontal frictionless axle so that the wheel is in a vertical plane. Three small objects having masses m, M, and 2 M, respectively, are mounted on the rim of the In which direction does it turn (as viewed wheel, as shown. from above)? M 1. | downward 60 R m 2M 2. horizontally, CW 3. horizontally, CCW 4. upward If the system is in static equilibrium, what is the value of m in terms of M? kolsawala (afk472) - 4-PHY317K-Homework - lang - (57345) 8 If W = mg, find the tension T in the cord. 5 M 1. m = 2 2 W quest.cns.utexas.edu8:52 1. I downward 60 R- m 2M 8 of 10izontally, CW 3. horizontally, CCW 4. upward If the system is in static equilibrium, what is the value of m in terms of M? kolsawala (afk472) - 4-PHY317K-Homework - lang - (57345) 8 If W = mg, find the tension T in the cord. 1. m = 5 M 2 W 3 M 1. T = 2. m = sin 0 3 W 3. m = 2 M 2. T = 2 sin 0 4. m = M 3. T = 2 W cos 0 2 W 5. m = M 2 4. T = cos 0 024 10.0 points 5. T = 3 W cos 0 A 2 kg rock is suspended by a massless CON string from one end of a 8 m measuring stick. 6. T = - W tan 0 3 W 0 1 2 3 4 5 6 7 8 7. T = tan 0 8. T = - W sin 0 CONO I 2 kg 9. T = - W cos 0 What is the mass of the measuring stick if 3 W 10. T = it is balanced by a support force at the 1 m sin 0 mark? 026 10.0 points A 23.2 kg person climbs up a uniform 144 N 1. 10 ladder. The upper and lower ends of the lad- 2. 6 der rest on frictionless surfaces. The bottom 3. 2.33333 of the ladder is fastened to the wall by a hori- 4. 1.2 zontal rope. The angle between the horizontal 5. 4.5 and the ladder is 54 6. 5 7. 1.66667 8. 5.33333 9. 0.666667 7.5 m 10. 1 Answer in units of kg. 025 10.0 points A uniform horizontal bar of mass m and 540 length L is held by a frictionless pin at a 2.5 m 144 N wall. The opposite end of the strut is sup- ported by a cord with tension T at an angle 23.2 kg T 0. A block of mass 2 m is hung from the bar at a distance of _ L from the pin. Find the tension in the rope when the per- son is one-third of the way up the ladder. The acceleration of gravity is 9.8 m/s . 1. 74.1797 W 2. 84.5235 3. 83.4882 (3/4) L 2w 4. 129.595 5. 121.419 kolsawala (afk472) - 4-PHY317K-Homework - lang - (57345) 9 6. 67.622 quest.cns.utexas.edu