E Home Х Quiz: ME05b_RT Х Х S SOLUTION: energy questions – Pl_x S MarceloTutor – Calculus Tutoring x + – t с F erau.instructure.com/courses/134938/quizzes/440391/take Assumptions. Unless a problem statement indicates otherwise: Home Strings: Assume ropes/strings/etc are ideal (massless with perfect flexibility). Syllabus Announcements Account Quizzes Additional recommendations and notes. Although this ME is open-notes/open-book, it is advisable to NOT rely heavily on your notes or book as that will slow you down and may not leave sufficient time to complete the exam itself. Prepare for this ME as you would for any other exam: Study and practice ahead of time. Because it is open-notes, we advise you to create a small equation sheet to reference during the exam. The ME is set to close automatically when time runs out. Assignments Dashboard Grades Courses People Pages Question 1 1 pts Groups Modules Calendar EagleVision Zoom 0 0 joli You drop a rock off a bridge spanning a river. As the rock falls, if its potential energy decreases by 72 J, by how much does its kinetic energy increase? Badges Inbox Tutor.com: 24/7 Online Tutoring ΔKE = J History Hunt Library Activate Windows Go to Settings to activate Windows. Studio 03:01 2 Type here to search זחן 73 °F 4x ENG 43/03/29 2 E Home Х E Quiz: ME05b_RT Х Х SOLUTION: energy questions – P! X S Marcelo Tutor – Calculus Tutoring x | + – t с erau.instructure.com/courses/134938/quizzes/440391/take F Home Question 2 1 pts Syllabus Announcements Account Quizzes Assignments Dashboard Grades Courses People Pages Groups Modules Calendar EagleVision Zoom 0 0 joli Badges Inbox Tutor.com: 24/7 Online Tutoring The peregrine falcon is the fastest animal, capable of reaching speeds over 200 mph in its dives. A 391 g falcon is hovering in a stationary position 858 m above the ground, and then goes into a dive. What is the bird’s speed when it it reaches a position 650 m above the ground? m/s History Hunt Library V= Activate Windows Go to Settings to activate Windows. Studio 03:01 2 Type here to search 73 °F 4x ENG 43/03/29 2 E Home x Х E Quiz: ME05b_RT Х Х S SOLUTION: energy questions – P! X S Marcelo Tutor – Calculus Tutoring x | + – t с erau.instructure.com/courses/134938/quizzes/440391/take F Home Swimmers at a water park have a choice of two frictionless water slides as shown in the figure. Although both slides drop over the same height, h, slide 1 is straight while slide 2 is curved, dropping quickly at first and then leveling out. Syllabus Announcements Account How does the speed v1 of a swimmer reaching the end of slide 1 compares with V2, the speed of a swimmer reaching the end of slide 2? Quizzes Assignments Dashboard Grades Slide 1 Slide 2 Courses People h Pages Groups Modules Calendar EagleVision Zoom 0 0 joli Badges O v1 = V2 Inbox O V1 > V2 Tutor.com: 24/7 Online Tutoring O V1 < V2 History Hunt Library O No general relationship exists between v1 and v2 because we do not know the curvature of slide 2. Activate Windows Go to Settings to activate Windows. Studio 03:02 Type here to search 73 °F 4x ENG 43/03/29 2 E Home Х Quiz: ME05b_RT Х Х SOLUTION: energy questions – P! X S Marcelo Tutor – Calculus Tutoring x | + – t с « erau.instructure.com/courses/134938/quizzes/440391/take F Question 4 1 pts Home Syllabus Announcements Account Quizzes Assignments Dashboard Grades h Courses People Pages m Groups Modules Calendar EagleVision Zoom A block is attached to an initially unstretched spring, and slowly lowered a distance 0.332 m, where it hangs motionless. The other end of the spring is attached to the ceiling. If the spring’s force constant is 34.6 N/m, what is the block’s mass? Badges Inbox Tutor.com: 24/7 Online Tutoring (Hint: Start with a free-body diagram of the block in its final position.) lojisi History Hunt Library m = kg Activate Windows Go to Settings to activate Windows. Studio 03:02 Type here to search וחו 73 °F 4x ENG 43/03/29 2 E Home x Х Quiz: ME05b_RT х Х SOLUTION: energy questions – P! X S Marcelo Tutor – Calculus Tutoring x | + – t с F i erau.instructure.com/courses/134938/quizzes/440391/take Question 5 1 pts Home Syllabus Announcements Account | Quizzes = Assignments Dashboard Here the spring is 1x = 0 neither stretched nor compressed 어 m Grades х Courses People 2016 Pearson Education, Inc. Pages Groups Modules Calendar EagleVision Zoom Gravitational potential energy can be positive or negative, depending on whether the object is above or below the vertical position chosen as y = 0. For a spring, x = 0 is defined as the spring’s equilibrium position. The spring can then be stretched, x > 0; or it can be compressed, x < 0. The elastic potential energy stored in the spring is positive for stretching the spring, and negative for compressing the spring. Badges Inbox Tutor.com: 24/7 Online Tutoring lojisi History Hunt Library O True Activate Windows Go to Settings to activate Windows. Studio O False 03:02 Type here to search וחו x] 73 °F 4x ENG 43/03/29 2 E Home Х Quiz: ME05b_RT Х Х SOLUTION: energy questions – P! X S Marcelo Tutor – Calculus Tutoring x | + – t с erau.instructure.com/courses/134938/quizzes/440391/take F Question 6 1 pts Home Syllabus Announcements Account Quizzes A ball is held in place at one end of the spring as shown in the figure. The spring is initially compressed by 0.073 m and the released. When the spring reaches its relaxed (uncompressed) position, all of its potential energy is transferred to the ball’s kinetic energy. What is the ball’s kinetic energy at that instant if the spring constant is k = 249 N/m. Assignments Dashboard Grades Courses People The compressed spring stores energy Pages Groups Before: Modules auringos www. ma Calendar EagleVision Zoom Badges Vi After: M : Inbox Tutor.com: 24/7 Online Tutoring The spring’s potential energy is trans- formed into the ball’s kinetic energy. lojisi History Hunt Library KE = J Activate Windows Go to Settings to activate Windows. Studio 03:03 Type here to search זחן 73 °F 4x ENG 43/03/29 2 Х E Home Х Quiz: ME05b_RT Х SOLUTION: energy questions – P! X S Marcelo Tutor – Calculus Tutoring x | + – t с erau.instructure.com/courses/134938/quizzes/440391/take F Question 7 1 pts Home Syllabus Announcements Account Quizzes Assignments Dashboard Grades h Courses People Pages m Groups Modules Calendar EagleVision Zoom Badges A 3.67 kg block is attached to the ceiling by an initially unstretched spring. The block is released from rest and drops a distance h before momentarily coming to rest again as the spring stretches. The spring’s force constant is k = 44 N/m. What is the block’s kinetic energy at the moment it has descended 1/3 h? Inbox Tutor.com: 24/7 Online Tutoring lojisi KE= J History Hunt Library Activate Windows Go to Settings to activate Windows. Studio 03:03 Type here to search זחן 73 °F 4x ENG 43/03/29 2 E Home Х E Quiz: ME05b_RT х х SOLUTION: energy questions – P! X Х S Marcelo Tutor – Calculus Tutoring x | + – t с erau.instructure.com/courses/134938/quizzes/440391/take F Home Syllabus Announcements = Account Quizzes | | Here the spring is Ix = 0 neither stretched nor compressed. O m Assignments Dashboard х Grades Courses People 2016 Pearson Education, Inc. Pages The figure shows a block attached to a spring. The spring is initially in its equilibrium position (Not stretched or compressed). Groups Modules If the block is pushed to the left and then released, the force the spring exerts on the block will be Calendar EagleVision Zoom Badges Inbox O to the left. Tutor.com: 24/7 Online Tutoring O to the right. lojisi History Hunt Library O up. O down. Activate Windows Go to Settings to activate Windows. Studio O zero. 03:04 e Type here to search זחן x] 73 °F 4x ENG 43/03/29 2 Х E Home Quiz: ME05b_RT х SOLUTION: energy questions – P! X Х S Marcelo Tutor – Calculus Tutoring x | + – t с i erau.instructure.com/courses/134938/quizzes/440391/take F Question 9 1 pts Home Syllabus Computation. Announcements Account Quizzes A child pulls on a little red wagon with a horizontal force of 68.7 N. The a wagon moves horizontally a distance of 31.1 m in 3.1 minutes. Assignments Calculate the average power generated by the child in that time frame. Dashboard Grades Courses People Par = W Pages Groups Modules Record your numerical answer below, assuming three significant figures. Remember to include a “-“if/when necessary. Calendar EagleVision Zoom 0 0 joli Badges Inbox Tutor.com: 24/7 Online Tutoring History Hunt Library Question 10 1 pts Activate Windows Go to Settings to activate Windows. Studio 03:04 2 Type here to search x] 73 °F 4x ENG 43/03/29 2 E Home Х Quiz: ME05b_RT Х Х S SOLUTION: energy questions – P! X S MarceloTutor – Calculus Tutoring x + – t с i erau.instructure.com/courses/134938/quizzes/440391/take F Question 10 1 pts Home Syllabus Announcements Account Quizzes Assignments Dashboard Grades Courses People Pages Groups Modules Calendar EagleVision Zoom 0 0 joli Badges During a steam-catapult launch from a carrier, the necessary acceleration can be around 4 g’s to reach take-off speed over the short distance. What delivered by the catapult to accelerate a 15,414 kg aircraft at 38.2 m/s2 across a deck 108.5 m long over 2.16 s? (Think about the work done on the aircraft by the catapult during the launch.) Inbox Tutor.com: 24/7 Online Tutoring History Hunt Library It is a large amount of power, so use MW (MegaWatt) as the units. (1 MW= 1,000,000W) Studio P=_ Activate Windows Go to Settings to activate Windows. MW 03:04 2 Type here to search 73 °F 4x ENG 43/03/29 2 E Home Х E Quiz: ME05b_RT х Х SOLUTION: energy questions – P! X S Marcelo Tutor – Calculus Tutoring x | + – t с erau.instructure.com/courses/134938/quizzes/440391/take F Home Syllabus Announcements Account Quizzes Assignments Question 11 1 pts Dashboard Grades Which of the following is false about power? Courses People Pages O Power is equal to the average force. Groups Modules O Power is the rate at which work is done Calendar EagleVision Zoom O The SI unit of power is a Watt [W] Badges O Power an be calculated by dividing work done by time Inbox Tutor.com: 24/7 Online Tutoring History Hunt Library Oleje No new data to save. Last checked at 3:04pm Submit Quiz Activate Windows Go to Settings to activate Windows. Studio 03:04 e Type here to search זחן 73 °F 4x ENG 43/03/29 2

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