Physics 151 Hamilton Aditya Singh SI Exam Review 11_13_2022 answer key

.pdf

School

University of Massachusetts, Amherst *

*We aren’t endorsed by this school

Course

151

Subject

Physics

Date

Apr 3, 2024

Type

pdf

Pages

26

Uploaded by DoctorPorpoiseMaster992

Aditya Singh SI Exam Review - 2 (If there’s something you don’t understand, please don’t hesitate to reach out to me) Q2. A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 7.00 revolutions every 10.0 seconds. What is the magnitude of the angular velocity of the ball? A) 2.2 rad/s B) 4.4 rad/s C) 7 rad/s D) 0.7 rad/s E) zero Ans: B) Q3. The ball from the previous question continues to spin in a circle with a radius 2.00 m making 7.00 revolutions every 10.0 seconds. What is the magnitude of the acceleration of the ball? A) 38.7 m/s 2 B) 74.2 m/s 2 Worksheet is intellectual property of UMass Amherst LRC’s SI Program Please Do Not Post Without Permission
C) 29.3 m/s 2 D) 67.9 m/s 2 E) 14.8 m/s 2 Ans: A) Q4. An object moves in a circle of radius R at constant speed with a period T. If you want to change only the period in order to cut the object's acceleration in half, the new period should be A) T/4. B) T 2. C) T/ 2. D) T/2. E) 4T. Ans: B) Worksheet is intellectual property of UMass Amherst LRC’s SI Program Please Do Not Post Without Permission
Q5. Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward but is gradually slowing down at a rate of 9 m/s2? is the force of the 𝐹 ? floor on the person and is the force of gravity on the person. 𝐹 ? Ans: C) Worksheet is intellectual property of UMass Amherst LRC’s SI Program Please Do Not Post Without Permission
Q6. Two particles, A and B, are in uniform circular motion about a common center. The acceleration of particle A is 8.5 times that of particle B. The period of particle B is 2.0 times the period of particle A. The ratio of the radius of the motion of particle A to that Worksheet is intellectual property of UMass Amherst LRC’s SI Program Please Do Not Post Without Permission
of particle B is closest to A. r A /r B = 18 B. r A /r B = 2.1 C. r A /r B = 17 D. r A /r B = 4.3 E. r A /r B = 0.24 Ans. B) Worksheet is intellectual property of UMass Amherst LRC’s SI Program Please Do Not Post Without Permission
Q7. Suppose you are playing hockey on a new-age ice surface for which there is no friction between the ice and the hockey puck. You wind up and hit the puck as hard as you can. After the puck loses contact with your stick, the puck will A. Speed up a little, and then move at a constant speed. B. Start to slow down. C. Not slow down or speed up. D. Speed up a little, and then slow down. Ans: C) Since there is no friction on the ice surface, there is no force acting on the puck horizontally. In the absence of any horizontal force on the puck, there will be no acceleration. No acceleration means constant velocity, so the puck will neither slow down nor speed up. Q8. A 7.0-kg object is acted on by two forces. One of the forces is 10.0 N acting toward the east. Which of the following forces is the other force if the acceleration of the object is 1.0 m/s 2 toward the east? A. 12 N east B. 6.0 N east C. 7.0 N west D. 3.0 N west E. 9.0 N west Worksheet is intellectual property of UMass Amherst LRC’s SI Program Please Do Not Post Without Permission
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help