PHYS 201 Midterm: PHYS 201 TAMU 201Fall 09 Exam 3
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No partial credit will be given. (6 pts) 1. A uniform wheel with radius r = 0. 200 m is rotating at constant angular velocity about a stationary axis through its center. The moment of inertia of the wheel for this axis is 8. 00 kg. m2. A horizontal turntable is rotating at 4. 0 rev/s about a vertical frictionless axle at its center. The turntable has a radius of 0. 500 m and a moment of inertia of 20 kg m2 for rotation about the axle. A bag of sand is dropped from a very small height onto the rim of the turntable. After the bag has come to rest relative to the turntable, the turntable is rotating at 3. 0 rev/s. The bag of sand can be treated as a point mass. What is the mass of the bag of sand? (a) 53. 3 kg (b) 80. 0 kg (c) 107. 0 kg (d) 6. 7 kg (e) 26. 7 kg (f) none of the above (6 pts) 4.
