2.5 HW Physical Applications

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Feb 20, 2024

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1/27/24, 3:37 PM 2.5 HW Physical Applications https://rsccd.instructure.com/courses/111152/assignments/2181504 1/6 2.5 HW Physical Applications Due Jan 11 by 2pm Points 10 Submitting an external tool Prepare Make sure you have read and viewed the following before you begin: Section Reading Section Videos Introduction You will view a video and then answer a question about it. For each question, you have unlimited attempts. After the third attempt, the answer will be given and a new version of the question can be generated. To navigate the assignment, use the page links on the left side of the assignment where it says "Pages" to view the different sections of the assignment and access all practice questions. Need Help? If you would like assistance from your instructor or classmates on this section, you may post to the module discussion board Module 2 - Area & Arc Length (https://rsccd.instructure.com/courses/111152/discussion_topics/1403185) . (https://rsccd.instructure.com/courses/111152/discussion_topics/1403191) Remember to copy and paste the question to the discussion board and tell us what you have done so far so that we can identify your problem and help you solve it. As a free resource to you, you may use the free online tutoring service: About NetTutor- Free Online Tutoring Services (https://rsccd.instructure.com/courses/111152/pages/about-net-tutoring) . The service is free to all online SAC students. In addition, there are three learning centers at SAC that you can use to get math help: SAC Academic Computing Center (https://sac.edu/AcademicProgs/Business/ACC/Pages/default.aspx) SAC Learning Center (http://www.sac.edu/AcademicProgs/HSS/LearningCenter/Pages/default.aspx) SAC Math Center (http://sac.edu/AcademicProgs/ScienceMathHealth/MathCenter/Pages/default.aspx)
1/27/24, 3:37 PM 2.5 HW Physical Applications https://rsccd.instructure.com/courses/111152/assignments/2181504 2/6 Due Date: Thu 1/11/24, 2:00 pm Score in Gradebook: 10/10 Grade is calculated on the best version of each question Show Intro and Between-Question Text You are in the gradebook. You cannot edit answers or submit questions from here. Question 1. Score: 1/1 Time spent on this version: 2.2 minutes. Show all tries Had help available: Video Question 2. Scored attempt. Score: 10/10 . Version 1*/1. Score: 1/1 How much work is done lifting a 10 pound object from the ground to the top of a 40 foot building if the cable used weighs 1.5 pounds per foot? 1600 foot-pounds. Version 3*/3. Score: 1/1 You are at the top of a 90 foot tall building and are lifting an object that weighs 140 pounds. The object is lifted from the bottom of the building to a height of 80 feet using a chain that weighs 0.3 pounds per foot. Represent the amount of WORK you do as an integral. Work = 140 + 0.3 90 − x dx a = 0 b = 80 ( )
1/27/24, 3:37 PM 2.5 HW Physical Applications https://rsccd.instructure.com/courses/111152/assignments/2181504 3/6 Score: 0.25/0.25 0.25/0.25 0.25/0.25 0.25/0.25 Time spent on this version: 0.9 minutes. Question 3. Score: 1/1 Time spent on this version: 1 minutes. Had help available: Video Question 4. Score: 0.25/0.25 0.25/0.25 0.25/0.25 0.25/0.25 Time spent on this version: 0.8 minutes. Show all tries Then evaluate the integral. Work = 12400 Version 2*/2. Score: 1/1 A force of pounds is required to hold a spring stretched 0.1 feet beyond its natural length. How much work (in foot-pounds) is done in stretching the spring from its natural length to 0.7 feet beyond its natural length? 2.45 Version 1*/1. Score: 1/1 A spring has a rest length of 12 inches and the spring constant is K = 4. How much work is done stretching the spring from a length of 12 inches to a length of 20 inches? Represent the amount of WORK as an integral. Work = 4 x dx a = 0 inches b = 8 inches Then evaluate the integral. Work = 128 inch*pounds
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1/27/24, 3:37 PM 2.5 HW Physical Applications https://rsccd.instructure.com/courses/111152/assignments/2181504 4/6 Question 5. Score: 0.25/0.25 0.25/0.25 0.25/0.25 0.25/0.25 Time spent on this version: 0.7 minutes. Question 6. Score: 1/1 Time spent on this version: 2.1 minutes. Show all tries Had help available: Video Question 7. Version 4*/4. Score: 1/1 A spring has a rest length of 9 inches and a force of 5 pounds stretches the spring to a length of 17 inches. How much work is done stretching the spring from a length of 9 inches to a length of 14 inches? Represent the amount of WORK as an integral. Work = 8 5 x dx a = 0 inches b = 5 inches Then evaluate the integral. Work = 7.8125 inch*pounds Version 1*/1. Score: 1/1 Work of Joules is done in stretching a spring from its natural length to 17 beyond its natural length. What is the force (in Newtons) that holds the spring stretched at the same distance (17 )? 47.06 Version 5*/5. Score: 1/1 A circular swimming pool has a diameter of 14 m, the sides are 3 m high, and the depth of the water
1/27/24, 3:37 PM 2.5 HW Physical Applications https://rsccd.instructure.com/courses/111152/assignments/2181504 5/6 Score: 1/1 Time spent on this version: 1.2 minutes. Had help available: Video Question 8. Score: 1/1 Time spent on this version: 0.4 minutes. Had help available: Video Question 9. is 2 m. How much work (in Joules) is required to pump all of the water over the side? (The acceleration due to gravity is 9.8 and the density of water is 1000 .) 6034369.6 Version 10*/10. Score: 1/1 A trough is 9 meters long, 3 meters wide, and 2 meters deep. The vertical cross-section of the trough parallel to an end is shaped like an isoceles triangle (with height 2 meters, and base, on top, of length 3 meters). The trough is full of water (density ). Find the amount of work in joules required to empty the trough by pumping the water over the top. (Note: Use as the acceleration due to gravity.) 176400 Joules Version 3*/3. Score: 2/2 A tank, shaped like a cone has height meters and base radius meters long. It is placed so that the circular part is upward. It is full of water, and we have to pump it all out by a pipe that is always leveled at the surface of the water. Assume that a cubic meter of water weighs , i.e. the density of water is ± . How much work does it require to pump all water out of the tank? Enter the exact value of your answer. 367500 π Joules
1/27/24, 3:37 PM 2.5 HW Physical Applications https://rsccd.instructure.com/courses/111152/assignments/2181504 6/6 Score: 2/2 Time spent on this version: 0.2 minutes. Return to Gradebook
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