Number 17 9. Sally has a mass if 45-kg and is moving with a speed of 10.0 m/s.a. Find Sally's kinetic energy.KE =(45) (l0)?(2250.3)V= 18. Sally's speed changes to 5.0 m/s. Now what is her kinetic enerey542.5J)m=#5K9"Vc.5 HöW much work was done to change her speed?KE =5nvKE=5 (45)(5)?Z250.- 562.5=687.5)10. Shawn and his bike have a total mass of 45.0-kg. Shawn rides 1800 m in 600 seconds at a constantvelocity. What is Shawn's kinetic energy?1800=606 -3KE =Ś (45)(3)?(2o253)KE =11. Matt and Will each have a mass of 60-kg and they are moving together with a velocity of 10.0 m/s.What is their combined kinețic energy?n=6o K9V=10.om/s12. A 2000-kg car has a velocity of 12.0 m/s. The car then hits a tree. The tree doesn't move and the carcomes to rest.a. Find the change in kinetic energy of the car.n= 7000 KV= 17.6 nlsb. Find the amount of work done in pushing in the front of the car.KE = (60) Clo)?(3000)KE-muKE =mv KE = (7000) (12.0)²-(4320 Jc. Find the size of the force that pushed in the front of the car in 0.50 m.13. How much potential energy does Tim, mass 60.0-kg, gain when he climbs a gymnasium rope a distance60 of 3.5 m?GPE=nghGPE = (60) (9.8)(3.5)=9: 9.82058.J14. A 6.4-kg bowling ball is lifted 2.1 m into a storage rack. Calculate the increase in the ball's potentialenergy.m=6.4K99=9.815. Mary weighs 500-N and walks down a flight of stairs to a level 5.50 m below her starting point, What isthe change in Mary's potential energy?F= S00 Nd- 5.5am16. Å weightlifter raises a 180-kg barbell to a height of 1.95 m. What is the increase in the barbell’spotential energy? m=180 K9GPE = mghGPE = (6.4) (9.8) (2-1)=131.717%3Dwi (500) (5.50)=2750Jg-9.8he1.98GPE = mgh OPE = (180)(9.8) (1-98) = 3492. 7217. A 10.0-kg rocket is fired vertically from Cape Canaveral. Its fuel gives it a kinetic energy of 1960 J bythe time the rocket motor burns out of fuel. What additional height will the rocket rise?18. A hallway of energy is constructed. People are told that to do 1.00 J of work, they should pull on a ropethat lifts a block 1.00 m. What should be the mass of the block?1) 27 = 3V KE = mu?GPE = mghPeriod:レ=fdWnst=DKE EnergyDirections: Read each of the following statements/questions. Answer them correctly and box your finai answer.1. A shot-putter heaves a 7.26-kg shot with a final velocity of 7.50 m/s.a. What is the kinetic energy if the shot?m= 7.26 K9V= 7.50 m/5KE -nutb. The shot was initially at rest. How much work was done on it to give it this kinetic energy?レ2. What is the kinetic energy of a 750-kg compact car traveling at 27.0 m/s?mu? KE =4)(750) (27)23. A 2.00-kg textbook is lifted from the floor to a shelf 2.10 m above the floor.mo 750 K9V= 27.0 mlşKE=Z273375.Ja.What is the gravitational potential energy relative to the floor?m= 2.00 K9GPEEmghgravitational potential energy relative to the head of a 1.65 m tall person? 7.1c - |. 65=-75GPE= (700) ( 9.g) () =H1.2b. What is theGPE = (7.0)(18)(.45)=8.8J)A 90-kg rock climber first climb 45 m upward to85 m to the bottom. Find the potential energy of the climber at the edge and at the bottom, using theinitial height as the reference level.top edge of a quarry, then, from the top, descends5. A 50.0-kg shell is shot fromm= S00 a. What is the gravitational potential energy with respect to Earth's surface of the Earth-shellcannon at Earth's surface to a height of 400 m.system when the shell is at this height?GPE -mgh196600-J)GPE= (50.0) (9.8) (400) =b. What is the change in potential energy of the system when the shell falls to a height of 200 m?GPE= (50.0) (9.8)098660.J)6. A person weighing 630-N climbs up a ladder to a height of 5.0m.a. What work does the person do?[-630N5.omboFdwil630) (5.0)3150.3こb. What is the increase in the gravitational potential energy of the person from the ground to thisheight?GPE FdSame thing7. A 1600-kg car travels at a speed of 12.5 m/s. What is its kinetic energy?m=1600 KJVー7.5 m/s.8. A racing car has a mass of 1500-kg. What is its kinetic energy if it has a speed of 30.0 m/s?KE- 2mu?KE = 7C1600) C17:5)?1800.Jmこ156 KgV= 30,0m/sKE -mu? KE = (1500)( 30.0)2675000.511) 27 = 3Va15) 212 = -4 + r

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Answered: 17. A 10.0-kg rocket is fired…

17. A 10.0-kg rocket is fired vertically from Cape Canaveral. Its fuel gives it a kinetic energy of 1960 J by the time the rocket motor burns out of fuel. What additional height will the rocket rise?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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