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by: Breanab

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Physics 151 practice exam chapters 8-10 PHYC 151 001

Marketplace > University of New Mexico > Physics 2 > PHYC 151 001 > Physics 151 practice exam chapters 8 10
Breanab
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This is a practice exam with examples from the notes
COURSE
General Physics
PROF.
Dr. Dave Cardimona
TYPE
Study Guide
PAGES
7
WORDS
CONCEPTS
Physics, unm
KARMA
50 ?

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This 7 page Study Guide was uploaded by Breanab on Monday March 21, 2016. The Study Guide belongs to PHYC 151 001 at University of New Mexico taught by Dr. Dave Cardimona in Winter 2016. Since its upload, it has received 61 views. For similar materials see General Physics in Physics 2 at University of New Mexico.

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Date Created: 03/21/16
Name: Physics 151 Sample Test #3 (Chapters 8-10) Ihollow cylinder or hoop, I solid cylinder or disk)MR , I solid sphere(2/5)MR , I solid rod about end/3)ML 2 g = 9.8 m/s2 1. A spring with a spring constant of 200N/m is compressed 15cm when a mass is placed on top of it. What is this mass? a. 3.1kg b. 9.8kg c. 310k d. 200kg 2. Two people sit on a 2.5 m long teeter-totter (fulcrum at the middle). One has a mass of 32 kg and sits on the end. The other has a mass of 59 kg. Where must the heavier person sit in order to balance the teeter-totter horizontally (with neither person touching the ground)? a. 1.25 m from fulcrum b. 0.767 m from fulcrum c. 0.678 m from fulcrum d. 0.554 m from fulcrum Don't forget supporting board at two ends with object on it AND Don't forget 'diving board' problem. 3. Three uniform objects having the same mass and diameter are released simultaneously from rest at the same distance above the bottom of a hill and roll down without slipping. The objects are a solid sphere, a solid cylinder, and a thin-walled hollow cylinder. Which of these objects will be the first one to reach the bottom of the hill? a. solid sphere b. solid cylinder c. thin-walled hollow cylinder d. all reach bottom at same time 4. Three uniform objects having the same mass and diameter are released simultaneously from rest at the same distance above the bottom of a hill and roll down without slipping. The objects are a solid sphere, a solid cylinder, and a thin-walled hollow cylinder. Which of these objects will have the greatest kinetic energy at the bottom of the hill? a. solid sphere b. solid cylinder c. thin-walled hollow cylinder d. all have same kinetic energy at bottom 5. Three uniform objects having the same mass and diameter are released simultaneously from rest at the same distance above the bottom of a hill and slide down without rolling. The objects are a solid sphere, a solid cylinder, and a thin-walled hollow cylinder. Which of these objects will be the first one to reach the bottom of the hill? a. solid sphere b. solid cylinder c. thin-walled hollow cylinder d. all reach bottom at same time Don’t forget Impulse = change in momentum: F t = m v – m v 0 (time, initial, final velocities - given one, find others) And Work = change in kinetic energy: F d = ½ m v – ½ m v 2 (distance, initial, final velocities 0 - given one, find others) 6. A block moving to the right on a frictionless floor collides with a block moving to the left. The two blocks stick together and move off as a unit. The total kinetic energy of the system after the collision: a. is smaller than the total kinetic energy before the collision. b. is equal to the kinetic energy before the collision. c. is greater than the total kinetic energy before the collision. d. is zero. e. cannot be determined without knowing the speeds of the two blocks 7. A block moving to the right on a frictionless floor collides with a block moving to the left. The two blocks stick together and move off as a unit. The total momentum of the system after the collision: a. is smaller than the total momentum before the collision, and in the same direction. b. is equal in magnitude to the momentum before the collision, but in the opposite direction. c. is the same in both magnitude and direction to the momentum before the collision. d. is greater than the total momentum before the collision, and in the same direction. e. is zero. f. cannot be determined without knowing the speeds of the two blocks 8. If I do 5 J of work in compressing a spring of force constant 250 N/m, how much energy is stored in the spring? a. 0.2 J b. 0.04 J c. 5 J d. 10 J e. cannot be determined without knowing the distance compressed 9. If only gravitational and/or elastic forces are involved, how much work is done on a ball whose kinetic energy increases by 3.5 J ? a. 3.5 J b. -3.5 J c. 1.75 J d. -1.75 J e. 0 f. cannot be determined without knowing the spring constant k, height h, and mass m 10. A turntable has a rotational inertia of 0.0169 kg m . It is initally rotating at a constant angular velocity of 33.3 rpm (rev/min). A record (rotational inertia of 0.00245 kg m ) is dropped onto the turntable such that it lands coaxially (the axes coincide). The initial angular velocity of the record is zero. After this "rotational collision," the disks will eventually rotate with the same angular velocity due to the friction between the turntable and the record. What is the final angular speed of the two disks? a. 27.7 rpm b. 28.8 rpm c. 29.1 rpm d. 30.1 rpm 11. Which of the following is a true statement concerning this rotational collision? a. Mechanical energy (sum of kinetic plus potential energies) is conserved. b. Angular momentum is conserved. c. Kinetic energy is conserved. d. Both angular momentum and kinetic energy are conserved. 12. A 10 kg block moving to the right with a velocity of 10 m/s collides with a 40 kg block at rest. If the 10 kg block is moving to the left at 6 m/s after the collision, what is the speed and direction of the 40 kg block after the collision? a. 10 m/s left b. 10 m/s right c. 6 m/s left d. 6 m/s right e. 4 m/s left f. 4 m/s right g. 1 m/s left h. 1 m/s right 13. Is the collision inelastic or elastic? a. inelastic b. elastic A constant force of 20 N is exerted on a 5 kg block, initially at rest, for a distance of 10 m along a horizontal frictionless surface. The block travels for an additional 10 m without the force acting upon it, and then travels up a frictionless hill whose height is 5 m. (See figure below.) Force stops 20N 5kg 5m 10m 10m 14. How much work does the force do on the block? a. 400 J b. 200 J c. 100 J d. 50 J 15. How fast is the block moving when the force stops? a. 80 m/s b. 8.94 m/s c. 7.94 m/s d. 6.94 m/s 16. How fast is the block moving just before it starts up the hill? a. 80 m/s b. 8.94 m/s c. 7.94 m/s d. 6.94 m/s 17. To what vertical height up the hill does the block travel? a. 2.08 m b. 3.08 m c. 4.08 m d. It travels over the top (max height would have been 5.08 if the hill had been high enough). 18. It takes 25 N to compress a spring a distance of 30 cm. That compressed spring then has a 3kg block placed in contact with it. The spring is released, causing the 3 kg block to accelerate along a frictionless floor. After leaving the spring, the 3kg block continues moving on the frictionless floor until it collides with and sticks to a 5kg block, initially at rest. What is the spring constant of the spring? a. 750 N/m b. 83.3 N/m c. 25 N/m d. 7.5 N/m e. 0.833 N/m 19. How fast is the 3kg block moving when it looses contact with the spring? a. 3.75 m/s b. 2.5 m/s c. 2.24 m/s d. 1.58 m/s 20. How fast are the two blocks moving after the collision? a. 0.693 m/s b. 0.593 m/s c. 0.493 m/s d. 0.393 m/s 21. Was the collision inelastic or elastic? a. inelastic b. elastic

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