Reviet Submission_ Practice Exam 3 part 1 – PHYS .._

pdf

School

University of Texas, Dallas *

*We aren’t endorsed by this school

Course

2326

Subject

Physics

Date

Dec 6, 2023

Type

pdf

Pages

Uploaded by CoachAntMaster981

5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&o… 1/18 Review Test Submission: Practice Exam 3 part 1 PHYS 2325.006 - Mechanics - S22 Course Homepage Exams Review Test Submission: Practice Exam 3 part 1 User Shivani Zala Course PHYS 2325.006 - Mechanics - S22 Test Practice Exam 3 part 1 Started 5/10/22 2:40 AM Submitted 5/10/22 2:41 AM Status Needs Grading Attempt Score Grade not available. Time Elapsed 1 minute Results Displayed All Answers, Submitted Answers, Correct Answers, Feedback, Incorrectly Answered Questions Question 1 Consider a block launched up an incline from a compressed massless spring. There is friction between the block and the incline. Include the cart and the spring in the momntum and energy totals Answer the following questions relating the energy and momentum from the time My eLearning 1 out of 3 points Shivani Zala 38 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&o… 2/18 Speci±ed Answer for: E Y Speci±ed Answer for: Px Y Speci±ed Answer for: Py Y Correct Answers for: E Evaluation Method Correct Answer Case Sensitivity Exact Match n Exact Match no Exact Match false Exact Match f Correct Answers for: Px Evaluation Method Correct Answer Case Sensitivity Exact Match n Exact Match no Exact Match false Exact Match f Correct Answers for: Py Evaluation Method Correct Answer Case Sensitivity Exact Match y Exact Match yes Exact Match true Exact Match t the spring is released to sometime later, after the spring has reached its maximal extension. Is the total energy (kinetic, gravitational, and elastic) conserved? [E] (Y/N) Is the total momentum in the x direction (see axes in the ±gure) conserved? [Px] (Y/N) Is the total momentum in the y direction (see axes in the ±gure) conserved? [Py] (Y/N) Question 2 1 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&o… 3/18 Speci±ed Answer for: E Y Speci±ed Answer for: Px Y Speci±ed Answer for: Py Y Correct Answers for: E Evaluation Method Correct Answer Case Sensitivity Exact Match n Exact Match no Exact Match false Exact Match f Correct Answers for: Px Evaluation Method Correct Answer Case Sensitivity Exact Match n Exact Match no Exact Match false Consider a cart attached to an ideal massless spring at the bottom of a pool ±rmly attached to the Earth. The cart can move without friction on the bottom of the pool, but feels the drag force by the water. Include only the cart’s energy and momentum in the totals. Is the total energy (kinetic, gravitational, and elastic) conserved? [E] (Y/N) Is the total momentum in the x direction (see axes in the ±gure) conserved? [Px] (Y/N) Is the total momentum in the y direction (see axes in the ±gure) conserved? [Py] (Y/N) 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&o… 4/18 Exact Match f Correct Answers for: Py Evaluation Method Correct Answer Case Sensitivity Exact Match y Exact Match yes Exact Match true Exact Match t Question 3 Speci±ed Answer for: E Y Speci±ed Answer for: Px Y Consider the above system of two blocks connected by massless frictionless pulley and rope. The block on the steeper incline is heavier so the system starts moving to the left. There is no friction between the blocks and the incline. Include the blocks in the momntum and energy totals (note that the rope and pulley are massless so they do not contribute to the energy or momentum). Answer the following questions relating the energy and momentum from the time the system is released to sometime later before the right block has collided with the pulley. Is the total energy (kinetic, gravitational, and elastic) conserved? [E] (Y/N) Is the total momentum in the x direction (see axes in the ±gure) conserved? [Px] (Y/N) Is the total momentum in the y direction (see axes in the ±gure) conserved? [Py] (Y/N) 1 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&o… 5/18 Speci±ed Answer for: Py Y Correct Answers for: E Evaluation Method Correct Answer Case Sensitivity Exact Match y Exact Match yes Exact Match true Exact Match t Correct Answers for: Px Evaluation Method Correct Answer Case Sensitivity Exact Match n Exact Match no Exact Match false Exact Match f Correct Answers for: Py Evaluation Method Correct Answer Case Sensitivity Exact Match n Exact Match no Exact Match false Exact Match f Question 4 Consider a projectile during ²ight without air drag. Only consider the projectile motion, do not include the launch or the crash with the ground. Is the total energy (kinetic, gravitational, and elastic) conserved? [E] (Y/N) 2 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&o… 6/18 Speci±ed Answer for: E Y Speci±ed Answer for: Px Y Speci±ed Answer for: Py Y Correct Answers for: E Evaluation Method Correct Answer Case Sensitivity Exact Match y Exact Match yes Exact Match true Exact Match t Correct Answers for: Px Evaluation Method Correct Answer Case Sensitivity Exact Match y Exact Match yes Exact Match true Exact Match t Correct Answers for: Py Evaluation Method Correct Answer Case Sensitivity Exact Match n Exact Match no Exact Match false Exact Match f Is the total momentum in the x direction (see axes in the ±gure) conserved? [Px] (Y/N) Is the total momentum in the y direction (see axes in the ±gure) conserved? [Py] (Y/N) Question 5 2 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&o… 7/18 Speci±ed Answer for: E Y Speci±ed Answer for: Px Y Speci±ed Answer for: Py Y Correct Answers for: E Evaluation Method Correct Answer Case Sensitivity Exact Match y Exact Match yes Exact Match true Exact Match t Correct Answers for: Px Evaluation Method Correct Answer Case Sensitivity Exact Match y Exact Match yes Exact Match true Consider a cart rolling with no friction down a wedge which is itself a cart able to roll on a ²at surface, again with no friction. Include the energy and momentum of both the cart and the wedge in the total energy and momentum. Is the total energy (kinetic, gravitational, and elastic) conserved? [E] (Y/N) Is the total momentum in the x direction (see axes in the ±gure) conserved? [Px] (Y/N) Is the total momentum in the y direction (see axes in the ±gure) conserved? [Py] (Y/N) 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&o… 8/18 Exact Match t Correct Answers for: Py Evaluation Method Correct Answer Case Sensitivity Exact Match n Exact Match no Exact Match false Exact Match f Question 6 Selected Answer: Answers: A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building. The bucket is initially at rest, but is traveling at 4.0 m/s when it reaches the top of the building. What is the minimum amount of work that the worker did in lifting the bucket? 160 J 3.92 kJ 400 J 560 J 160 J 4.08 kJ Question 7 Selected Answer: Answers: A block slides down a frictionless inclined ramp. If the ramp angle is 17.0° and its length is ±nd the speed of the block as it reaches the bottom of the ramp, assuming it started sliding from rest at the top. 13.1 m/s 172 m/s 13.1 m/s 9.26 m/s 24.0 m/s 0 out of 3 points 3 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&o… 9/18 Question 8 Selected Answer: Answers: A constant horizontal pull acts on a sled on a horizontal frictionless ice pond. The sled starts from rest. When the pull acts over a distance x , the sled acquires a speed v and a kinetic energy K . If the same pull instead acts over twice this distance, the sled's speed will be 2 v and its kinetic energy will be 2 K . the sled's speed will be v and its kinetic energy will be 2 K . the sled's speed will be 4 v and its kinetic energy will be 2 K. the sled's speed will be 2 v and its kinetic energy will be 2 K . the sled's speed will be 2 v and its kinetic energy will be K . the sled's speed will be v and its kinetic energy will be K . Question 9 Selected Answer: Answers: A uniform solid sphere of mass M and radius R rotates with an angular speed ω about an axis through its center. A uniform solid cylinder of mass M , radius R , and length 2 R rotates through an axis running through the central axis of the cylinder. What must be the angular speed of the cylinder so it will have the same rotational kinetic energy as the sphere? ω / 2 ω /5 ω 4 ω /5 ω / 0 out of 3 points 0 out of 3 points

5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&… 10/18 2 ω / Question 10 Selected Answer: Answers: A 620-g object traveling at 2.1 m/s collides head-on with a 320-g object traveling in the opposite direction at 3.8 m/s. If the collision is perfectly elastic, what is the change in the kinetic energy of the 620-g object? It loses 1.4 J. It loses 0.23 J. It gains 0.69 J. It loses 1.4 J. It loses 0.47 J. It doesn't lose any kinetic energy because the collision is elastic. Question 11 Selected Answer: Answers: A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s with negligible friction and air resistance. What is the average power delivered by the engine? (1 hp = 746 W) 50 hp 70 hp 50 hp 60 hp 90 hp 80 hp Question 12 A traveler pulls on a suitcase strap at an angle 36° above the horizontal. If of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap? 0 out of 3 points 0 out of 3 points 0 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&… 11/18 Selected Answer: Answers: 85 N 85 N 61 N 75 N 92 N Question 13 Selected Answer: Answers: A car of mass 1689 kg collides head-on with a parked truck of mass 2000 kg. Spring mounted bumpers ensure that the collision is essentially elastic. If the velocity of the truck is (in the same direction as the car's initial velocity) after the collision, what was the initial speed of the car? 29 km/h 29 km/h 10 km/h 38 km/h 19 km/h Question 14 Selected Answer: Answers: A 620-g object traveling at 2.1 m/s collides head-on with a 320-g object traveling in the opposite direction at 3.8 m/s. If the collision is perfectly elastic, what is the change in the kinetic energy of the 620-g object? It gains 0.69 J. It loses 1.4 J. It loses 0.23 J. It gains 0.69 J. It loses 0.47 J. It doesn't lose any kinetic energy because the collision is elastic. 0 out of 3 points 0 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&… 12/18 Question 15 Selected Answer: Answers: A 2.3-kg object traveling at 6.1 m/s collides head-on with a 3.5-kg object traveling in the opposite direction at 4.8 m/s. If the collision is perfectly elastic, what is the ±nal speed of the ? 6.6 m/s 4.3 m/s 7.1 m/s 6.6 m/s 0.48 m/s 3.8 m/s Question 16 Selected Answer: Y Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match 21.4 N • s A 2.50-kg stone is dropped from rest at a height of 3.75 m. What impulse does gravity impart to this stone from the instant it is dropped until it hits the ground, assuming negligible air resistance? Question 17 Selected Answer: Answers: A ±recracker breaks up into several pieces, one of which has a mass of 200 g and ²ies o³ along the x -axis with a speed of 82.0 m/s. A second piece has a mass of 300 g and ²ies o³ along the y -axis with a speed of 45.0 m/s. What are the magnitude and direction of the total momentum of these two pieces? 361 kg • m/s at 56.3° from the x -axis 361 kg • m/s at 56.3° from the x -axis 93.5 kg • m/s at 28.8° from the x -axis 21.2 kg • m/s at 39.5° from the x -axis 0 out of 3 points 0 out of 3 points 0 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&… 13/18 21.2 kg • m/s at 56.3° from the x -axis 361 kg • m/s at 0.983° from the x -axis Question 18 Selected Answer: Answers: A billiard ball traveling at 3.00 m/s collides perfectly elastically with an identical billiard ball initially at rest on the level table. The initially moving billiard ball de²ects 30.0° from its original direction. What is the speed of the initially stationary billiard ball after the collision? 0.866 m/s 1.50 m/s 0.866 m/s 2.59 m/s 2.00 m/s 0.750 m/s Question 19 Selected Answer: Answers: A 1000.0 kg car is moving at If a truck has 18 times the kinetic energy of the car, how fast is the truck moving? 54 km/h 36 km/h 63 km/h 54 km/h 45 km/h Question 20 Selected Answer: A 4.50-kg wheel that is 34.5 cm in diameter rotates through an angle of 13.8 rad as it slows down uniformly from 22.0 rad/s to 13.5 rad/s. What is the magnitude of the angular acceleration of the wheel? 10.9 rad/s 2 0 out of 3 points 0 out of 3 points 3 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&… 14/18 Answers: 5.45 rad/s 2 10.9 rad/s 2 0.616 rad/s 2 22.5 rad/s 2 111 rad/s 2 Question 21 Selected Answer: Answers: A student slides her 80.0-kg desk across the level ²oor of her dormitory room a distance 4.00 m at constant speed. If the coe´cient of kinetic friction between the desk and the ²oor is 0.400, how much work did she do? 1.26 kJ 3.14 kJ 26.7 J 128 J 1.26 kJ 24.0 J Question 22 Selected Answer: Answers: A billiard ball traveling at 3.00 m/s collides perfectly elastically with an identical billiard ball initially at rest on the level table. The initially moving billiard ball de²ects 30.0° from its original direction. What is the speed of the initially stationary billiard ball after the collision? 2.00 m/s 0.750 m/s 2.00 m/s 2.59 m/s 0.866 m/s 1.50 m/s 3 out of 3 points 0 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&… 15/18 Question 23 Selected Answer: Answers: A 2.00-kg object traveling east at 20.0 m/s collides with a 3.00-kg object traveling west at 10.0 m/s. After the collision, the 2.00-kg object has a velocity 5.00 m/s to the west. How much kinetic energy was lost during the collision? 91.7 J 0.000 J 91.7 J 458 J 175 J 516 J Question 24 Selected Answer: Y Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match 21.4 N • s A 2.50-kg stone is dropped from rest at a height of 3.75 m. What impulse does gravity impart to this stone from the instant it is dropped until it hits the ground, assuming negligible air resistance? Question 25 Selected Answer: Correct Answer: A 1.15-kg grinding wheel 22.0 cm in diameter is spinning counterclockwise at a rate of 20.0 revolutions per second. When the power to the grinder is turned o³, the grinding wheel slows with constant angular acceleration and takes 80.0 s to come to a rest. (a) What was the angular acceleration (in rad/s 2 ) of the grinding wheel as it came to rest if we take a counterclockwise rotation as positive? (b) How many revolutions did the wheel make during the time it was coming to rest? Y 0 out of 3 points 0 out of 3 points Needs Grading 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&… 16/18 Response Feedback: [None Given] (a) -1.57 rad/s 2 (b) 800 revolutions Question 26 Selected Answer: Answers: A crane lifts a 425 kg steel beam vertically a distance of How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s 2 ? Neglect frictional forces. 4.0 × 10 5 J 3.4 × 10 5 J 4.0 × 10 5 J 4.9 × 10 5 J 5.8 × 10 5 J Question 27 Selected Answer: Answers: A 4.0-kg object is moving with speed 2.0 m/s. A 1.0-kg object is moving with speed Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping? the 4.0-kg object the 4.0-kg object the 1.0-kg object Both objects travel the same distance. It is impossible to know without knowing how long each force acts. Question 28 A 3.45-kg centrifuge takes 100 s to spin up from rest to its ±nal angular speed with constant angular acceleration. A point located 0 out of 3 points 0 out of 3 points Needs Grading 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&… 17/18 Selected Answer: Correct Answer: Response Feedback: [None Given] What is the angular acceleration (in rad/s 2 ) of the centrifuge as it spins up? How many revolutions does the centrifuge make as it goes from rest to its ±nal 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed. (a) (b) angular speed? Y (a) 18.8 rad/s 2 (b) 1.49 × 10 4 revolutions Question 29 Selected Answer: Answers: A ±recracker breaks up into several pieces, one of which has a mass of 200 g and ²ies o³ along the x -axis with a speed of 82.0 m/s. A second piece has a mass of 300 g and ²ies o³ along the y -axis with a speed of 45.0 m/s. What are the magnitude and direction of the total momentum of these two pieces? 93.5 kg • m/s at 28.8° from the x -axis 21.2 kg • m/s at 39.5° from the x -axis 361 kg • m/s at 0.983° from the x -axis 93.5 kg • m/s at 28.8° from the x -axis 361 kg • m/s at 56.3° from the x -axis 21.2 kg • m/s at 56.3° from the x -axis Question 30 Selected Answer: Answers: A machinist turns the power on to a grinding wheel, which is at rest at time . The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of The wheel is run at that angular velocity for 37 s and then power is shut o³. The wheel decelerates uniformly at until the wheel stops. In this situation, the time interval of angular deceleration (slowing down) is closest to 23 s. 15 s. 21 s. 0 out of 3 points 0 out of 3 points 5/11/22, 12:13 AM Review Test Submission: Practice Exam 3 part 1 – PHYS ... https://elearning.utdallas.edu/webapps/assessment/review/review.jsp?attempt_id=_36067525_1&course_id=_223263_1&content_id=_5465135_1&… 18/18 Wednesday, May 11, 2022 12:13:23 AM CDT 23 s. 19 s. 17 s. ← OK

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

Reviet Submission_ Practice Exam 3 part 1 – PHYS .._

Related Documents