# AP practice ch 7-8 Multiple Choice

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1 AP practice ch 7-8 Multiple Choice 1. A spool of thread has an average radius of 1.00 cm. If the spool contains 62.8 m of thread, how many turns of thread are on the spool? "Average radius" allows us to not need to treat the layering of threads on lower layers. a) 100 b) c) d) A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20 s. It is then turned off and coasts to a stop in an additional 40 s. The ratio of the average angular acceleration for the first 20 s to that for the last 40 s is which of the following? a) 2 b) 0.5 c) 0.5 d) 2 3. Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval? a) 0.25 T b) 0.50 T c) 0.67 T d) 0.71 T 4. The end of the cutting cord on a gas-powered weed cutter is 0.15 m in length. If the motor rotates at the rate of 20 rev/s, what is the tangential speed of the end of the cord? a) 628 m/s b) 25 m/s c) 19 m/s d) 63 m/s 5. A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.15 m/s? a) 3.0 rev/s b) 1.5 rev/s c) 0.48 rev/s d) 0.24 rev/s 6. Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the linear and angular velocities of the point. a) Both are constant. b) Only the angular velocity is constant. c) Only the linear velocity is constant. d) Neither is constant. 7. When a point on the rim of a 0.30-m-radius wheel experiences a centripetal acceleration of 4.0 m/s 2, what tangential acceleration does that point experience? a) 1.2 m/s 2 b) 2.0 m/s 2 c) 4.0 m/s 2 d) Cannot determine with the information given.

3 d) 4.2 years 16. A bucket of water with total mass 23 kg is attached to a rope, which in turn, is wound around a m radius cylinder at the top of a well. A crank with a turning radius of 0.25 m is attached to the end of the cylinder. What minimum force directed perpendicular to the crank handle is required to just raise the bucket? (Assume the rope's mass is negligible, that cylinder turns on frictionless bearings, and that g = 9.8 m/s 2.) a) 45 N b) 68 N c) 90 N d) 135 N 17. Masses are distributed in the x,y-plane as follows: 6.0 kg at (0.0, 0.0) m, 4.0 kg at (2.0, 0.0) m, and 5.0 kg at (2.0, 3.0) m. What is the x-coordinate of the center of gravity of this system of masses? a) 18 m b) 2.0 m c) 1.2 m d) 1.0 m 18. A meter stick is supported by a knife-edge at the 50-cm mark. Doug hangs masses of 0.40 and 0.60 kg from the 20-cm and 80-cm marks, respectively. Where should Doug hang a third mass of 0.30 kg to keep the stick balanced? a) 20 cm b) 70 cm c) 30 cm d) 25 cm 19. A uniform 1.0-N meter stick is suspended horizontally by vertical strings attached at each end. A 2.0-N weight is suspended from the 10-cm position on the stick, another 2.0-N weight is suspended from the 50 cm position, and a 3.0-N weight is suspended from the 60 cm position. What is the tension in the string attached at the 100-cm end of the stick? a) 1.9 N b) 3.0 N c) 3.5 N d) 4.0 N 20. A 4.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, 4.0) m. What is the moment of inertia of this system of masses about the x-axis? a) 160 kg m 2 b) 90 kg m 2 c) 250 kg m 2 d) 32 kg m According to Newton's second law, the angular acceleration experienced by an object is directly proportional to: a) its moment of inertia. b) the net applied torque. c) the object's size. d) choices a and b above are both valid. 22. A baseball pitcher loosens up his pitching arm. He tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 12 m/s in a time of 0.40 s, what torque is applied to the ball while being held by the pitcher's hand to produce the angular acceleration? a) 1.1 N m b) 11 N m c) 7.2 N m d) 1.4 N m

5 b) 50.0 m c) 72.7 m d) 89.9 m

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### The student will be able to: 1 Determine the torque of an applied force and solve related problems.

Honors Physics Assignment Rotational Mechanics Reading Chapters 10 and 11 Objectives/HW The student will be able to: HW: 1 Determine the torque of an applied force and solve related problems. (t = rx r

### Name: AP Physics C: Kinematics Exam Date:

Name: AP Physics C: Kinematics Exam Date: 1. An object slides off a roof 10 meters above the ground with an initial horizontal speed of 5 meters per second as shown above. The time between the object's