Number 12 KE=4 mužGPE = mghPertoレ=fdWnat-DKE EnergyDirections: Read each of the following statements/questions. Answer them correctly1A 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/sKE -nuKE .26X7.50)= |204.2Jb. The shot was initially at rest. How much work was done on it to give it this kinetic energy?W=KEF wZ64.2J)2. What is the kinetic energy of a 750-kg compact car traveling at 27.0 m/s?me 750 kgV= 27.0 mls3. A 2.00-kg textbook is lifted from the floor to a shelf 2.10 m above the floor.a. What is the gravitational potential energy relative to the floor?KE =4.? KE 4)(750) (27)2273375, Jm= 2.00SPE=rgh aPE : (7.6) ( 9.8) (2-10) - t1.2b. What is the gravitational potential energy relative to the head of a 1.65 m tall person? 7.16-1.65:-75GPE = (7-0)(98) (.45)=8.8J)A 90-kg rock climber first climb 45 m upward to the top edge of a quarry, then, from the top, descends85 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.5. A 50.0-kg shell is shot from a cannon at Earth's surface to a height of 400 m.What is the gravitational potential energy with respect to Earth's surface of the Earth-shellsystem when the shell is at this height?GPE = mghm= Se0 a.GPE= (50.0) ( 9.8) (400) =196660-J9-9.8h=400b. 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) (Zoo) =6. A person weighing 630-N climbs up a ladder to a height of 5.0m.198600.J)a. What work does the person do?f=630MFd w=(630) (5.0) = 3150.Jd= 5.om wrb. 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= 17.5 m/sKE = ZC 1600) C12.5)?1800.J8. A racing car has a mass of 1500-kg. What is its kinetic energy if it has a speed of 30.0 m/s?m=1500 KgV- 30,0mls KEmoe KE= (1500)( 30 0)2V= 3o,0m/s675000.511) 27 = 315) 212 = 4+, 13)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.(45)(l0)(2250.5)KE = + mvzKEV= 1B. Sally's speed changes to 5.0 m/s. Now what is her kinetic energy?m=45K9"KE =5nvV C. HOW much work was done to change her speed?562.5J)KE=5 (45)(5)?2250:10. 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)" (20253)KE = mvz1111. 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 carKE-KE = ( 60) Clo)3000.)comes to rest.a. Find the change in kinetic energy of the car.n- 7000 K)V= 17.6 nl5b. Find the amount of work done in pushing in the front of the car.KE= mv? KE= (7000) (12:0)-(4320Jc.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 distance66 of 3.5 m?GPE=nghGPE = (60) ( 9.)3.5)=9= 9.82058.314. A 6.4-kg bowling ball is lifted 2.1 m into a storage rack. Calculate the increase in the ball's potentialenergy.m= 6.4 K99=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?E= 500 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)131.712J(500) (5.50)= 2750Jg-9.8GPE= mgh OPE = C180)(9-8) (1-98) 3492.72J17. 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?

12)Given, Mass of car(m)= 2000kg Initial velocity of car (u)= 12 m/s Final velocity of car (v)= 0m/s…

V=10.om/s 12. 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 car comes to rest. a. Find the change in kinetic energy of the car. n=7000 K V= 17.6 nl5 b. Find the amount of work done in pushing in the front of the car. て KE= " KE = (7000) (12-0)-4320J %3D A c. Find the size of the force that pushed in the front of the car in 0.50 m.

V=10.om/s 12. 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 car comes to rest. a. Find the change in kinetic energy of the car. n=7000 K V= 17.6 nl5 b. Find the amount of work done in pushing in the front of the car. て KE= " KE = (7000) (12-0)-4320J %3D A c. Find the size of the force that pushed in the front of the car in 0.50 m.

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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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.

Question

Number 12

13)
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.
(45)(l0)
(2250.5)
KE = + mvz
KE
V= 1B. Sally's speed changes to 5.0 m/s. Now what is her kinetic energy?
m=45K9"
KE =5nv
V C. HOW much work was done to change her speed?
562.5J)
KE=5 (45)(5)?
2250:
10. Shawn and his bike have a total mass of 45.0-kg, Shawn rides 1800 m in 600 seconds at a constant
velocity. What is Shawn's kinetic energy?
1800-606 -3
KE =Ś (45)(3)" (20253)
KE = mvz
11
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 K9
V=10.om/s
12. 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 car
KE-
KE = ( 60) Clo)
3000.)
comes to rest.
a. Find the change in kinetic energy of the car.
n- 7000 K)
V= 17.6 nl5
b. Find the amount of work done in pushing in the front of the car.
KE= mv? KE= (7000) (12:0)-(4320J
c.
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 distance
66 of 3.5 m?
GPE=ngh
GPE = (60) ( 9.)3.5)=
9= 9.8
2058.3
14. A 6.4-kg bowling ball is lifted 2.1 m into a storage rack. Calculate the increase in the ball's potential
energy.
m= 6.4 K9
9=9.8
15. Mary weighs 500-N and walks down a flight of stairs to a level 5.50 m below her starting point, What is
the change in Mary's potential energy?
E= 500 N
d- 5.5am
16. Å weightlifter raises a 180-kg barbell to a height of 1.95 m. What is the increase in the barbell's
potential energy? m=180 K9
GPE = mgh
GPE = (6.4) (9.8) (2-1)
131.712J
(500) (5.50)= 2750J
g-9.8
GPE= mgh OPE = C180)(9-8) (1-98) 3492.72J
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?
18. A hallway of energy is constructed. People are told that to do 1.00 J of work, they should pull on a rope
that lifts a block 1.00 m. What should be the mass of the block?

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