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20. In a railroad yard, a 2.5 X 104-kg boxcar moving at 8.5 m/s is stopped by a spring-loaded bumper mounted at the end of the level track. Ifk 3.4 MN/m, how far does the spring compress in stopping the boxcar?

20. In a railroad yard, a 2.5 X 104-kg boxcar moving at 8.5 m/s is stopped by a spring-loaded bumper mounted at the end of the level track. Ifk 3.4 MN/m, how far does the spring compress in stopping the boxcar?

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
Problem 9.94PAE
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an initial speed of 3.2 m/s. She then coasts with no further effort. for it to store 280 J of energy? 23. You push a 65-kg table across a 3.7-m-wide room. In the process, the table/floor system. What's the coefficient of kinetic friction bondsb vons, fension 16. A biophysicist grabs the ends of a DNA strand with optical twee- zers and stretches it 26 um. How much energy is stored in the stretched molecule if its spring constant is 0.046 pN/µm? BIO Section 7.3 Conservation of Mechanical Energy 17. A skier starts down a frictionless 32° slope. After a vertical drop of 25 m, the slope temporarily levels out and then slopes down at 20°, dropping an additional 38 m vertically before leveling out again. Find the skier's speed on the two level stretches. 18. A 1.1 X 104-kg navy jet lands on an aircraft carrier and snags a cable to slow it down. The cable is attached to a spring with 45 kN/m. If the spring stretches 25 m to stop the plane, what was its landing speed? 19. A 130-g arrow is shot vertically from a bow whose effective spring constant is 400 N/m. If the bow is drawn 85 cm before shooting, to what height does the arrow rise? 20. In a railroad yard, a 2.5 × 101-kg boxcar moving at 8.5 m/s is stopped by a spring-loaded bumper mounted at the end of the level track. Ifk k 3.4 MN/m, how far does the spring compress in stopping the boxcar? 21. You work for a toy company, and you're designing a spring- launched model rocket. The launching apparatus has room for a spring that can be compressed 14 cm, and the rocket's mass is 65 g. If the rocket is to reach an altitude of 33 m, what should you specify for the spring constant? znoitsailggA Section 7.4 Nonconservative Forces 22. A 54-kg ice skater pushes off the wall of the rink, giving hersen If the frictional coefficient between skates and ice is 0.023, ho" far does she go? cpeute 1.7 kJ of mechanical energy gets converted to internal enele of 3: between table and floor?
Transcribed Image Text:an initial speed of 3.2 m/s. She then coasts with no further effort. for it to store 280 J of energy? 23. You push a 65-kg table across a 3.7-m-wide room. In the process, the table/floor system. What's the coefficient of kinetic friction bondsb vons, fension 16. A biophysicist grabs the ends of a DNA strand with optical twee- zers and stretches it 26 um. How much energy is stored in the stretched molecule if its spring constant is 0.046 pN/µm? BIO Section 7.3 Conservation of Mechanical Energy 17. A skier starts down a frictionless 32° slope. After a vertical drop of 25 m, the slope temporarily levels out and then slopes down at 20°, dropping an additional 38 m vertically before leveling out again. Find the skier's speed on the two level stretches. 18. A 1.1 X 104-kg navy jet lands on an aircraft carrier and snags a cable to slow it down. The cable is attached to a spring with 45 kN/m. If the spring stretches 25 m to stop the plane, what was its landing speed? 19. A 130-g arrow is shot vertically from a bow whose effective spring constant is 400 N/m. If the bow is drawn 85 cm before shooting, to what height does the arrow rise? 20. In a railroad yard, a 2.5 × 101-kg boxcar moving at 8.5 m/s is stopped by a spring-loaded bumper mounted at the end of the level track. Ifk k 3.4 MN/m, how far does the spring compress in stopping the boxcar? 21. You work for a toy company, and you're designing a spring- launched model rocket. The launching apparatus has room for a spring that can be compressed 14 cm, and the rocket's mass is 65 g. If the rocket is to reach an altitude of 33 m, what should you specify for the spring constant? znoitsailggA Section 7.4 Nonconservative Forces 22. A 54-kg ice skater pushes off the wall of the rink, giving hersen If the frictional coefficient between skates and ice is 0.023, ho" far does she go? cpeute 1.7 kJ of mechanical energy gets converted to internal enele of 3: between table and floor?
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