1. SMDEP Physics Uniform Circular Motion Work, Kinetic Energy

2. Ch 7, #13(a): force of man on piano 1.3724 N 2.363 N 3.1691 N 4.846 N 5.Other 6.Didn’t finish

3. Ch 7, #13(b),(c): work done by man on piano, by friction on piano 1.-1270 J, -4650 J 2.-4650 J, -1270 J 3.-5920 J, -4650 J 4.-4650 J, -5920 J 5.Other 6.Didn’t finish

4. Ch 7, #13(d),(e): work done by gravity on piano, net work on piano 1.5920 J, 0 J 2.13030 J, 0 J 3.5920 J, 11840 J 4.11840 J, 5920 J 5.Other 6.Didn’t finish

5. Ch 7, #21(a),(b),(c): dot products 1.14.9, 238, -3.9 2.149, -238, 39 3.-14.9, -238, -3.9 4.-149, 238, 3.9 5.Other 6.Didn’t finish

6. Ch 7, #31: work required 1.89 J 2.8.9 J 3.0.89 J 4.0.089 J 5.Other 6.Didn’t finish

7. Ch 7, #52(a), (b): final velocities 1.x sqrt(2k/m), x sqrt(3k/4m) 2.x sqrt(k/m), x sqrt(3k/4m) 3.x sqrt(4k/m), x sqrt(k/4m) 4.x sqrt(k/m), x sqrt(k/4m) 5.Other 6.Didn’t finish

8. Attendance: Where are you going this weekend? 1.New York City 2.Boston 3.Beaches 4.Arts and Ideas/New Haven 5.Elsewhere to see relatives 6.Elsewhere to see friends 7.Library

9. A box sits on a conveyor belt without slipping. The belt begins at rest, then begins moving to the right. While the belt is reaching its final speed, the force of friction on the box is: 1.To the right 2.Zero 3.To the left

10. A box sits on a conveyor belt without slipping. The belt maintains a constant speed to the right. The force of friction on the box is: 1.To the right 2.Zero 3.To the left

11. A truck with a bucket free to slide around in the (frictionless) bed, turns right. Which force causes the bucket to slide to the left side of the truck? 1.Frictional force. 2.Centrifugal force 3.Attraction to the truck bed 4.“g” force 5.Centripetal force 6.No force

12. A rider in an amusement park “anti-gravity” ride finds herself plastered to the wall (once the ride is spinning rapidly and the floor has fallen away). Which diagram correctly shows the forces acting on her at the instant shown below, where she is on the right in a side view of the circular ride. 1.A 2.B 3.C 4.D 5.E 6.Other