97.01: A force F directed at an angle of θ7q2l topw;:2qlh g msi4s1r9 4xhyr.t above the horizontal is used to pull a crate a distance D across a level floor. The work done by the fohl2y4q2smt 9i :rx; w4hol7q gp.1rst rce F is

  97.33: A softball player catches a ball of mass m, which is moving toward her wi t t(0w(durg01lhph5h th horizontal speed v.5 ((wth0 htugpr1lh0 d While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction labor:1 pk6v zj(lo uqe0d(fer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. Duri6kf0d u qzl: (o(evpj1ng these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizont gf0g0y0 :l uatkr 8ckli)8c)fal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0i:)g k )f8gt0fa8cllr0y0ukc J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration on a horizoiyxo6:* uhu;24kgcmdntal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J i gohymcud u*264 :;xkto 20.0 J in this time.
Which one of the following choices best represents the magnitude of the block’s acceleration during the motion described?

  16.11: A 12.0 N net force directed to the right is exerted on ;lel 3ot99 p,(z,bxl3m ywhj ma 3.0 kg block for 5.0 s. The block was initially at rest and slides on a ho e3l9bowht mxlp( ,y m;j3z,9lrizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force directed to the right is exerte 6uv( btgj2ro irsu.8.tg.u0nd on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfavs .(n.gi g6u2.tot0 r8 jburuce.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student ini g:q/ov75qmxz(j vzq5 tially at reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, (zz7jq5 q v5:gqxo/vmthe hammer moves off in one direction while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An sn j* ca,j58f 7;zhlhghour after the fan has been turned z 5l7j hhafn8jg,*cs; off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block /xl y)v tyz0u;of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerati;0lt x yz)yu/von of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle she mm9 7ue2c(d*ioxe2mvlf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 mm2emi9ue 7m xcod*2(v from the floor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000o do9k+*q ol5gr +e)bn fe0zg2 watts (about 32 horsepower) of power to a car's driving wheeleob)9* zg0g+o+ed 5nkfqr ol2s. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s atyx-l7 xwp,1ty krc -;y +ldbch8y7w9z the bottom of a rough, fixed in h7 zcl wx9wy-yl+p k1b-8t7yycrx;,d clined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly to the left with a constant force ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure to the rightsz44 svbvwdh l vi ;7:nbzut:.fhl5+*9uq 1yz, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. Thuzf9z4vs 4;7vh bqby+ td:.l iwz*:5v1n lus he box slides with constant acceleration to the top of the incline as it is being pushed directly to the left with a constant force of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the r5: x dlbhodug-ju d935ight, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, xg5b luddju5od 9h-3:Car A has speed B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force a.g*u cf7m gbf0cting on the object during the time interval of the acce 0cu7*fmgb.fg leration?

  12.08: Through what distance does the object move during the time interval of th+le nf83 jw /z.7tfsode/cvb9e acceler89esfvt3 o c j/+l7/e .zbnfdwation

  12.19: The magnitude of the linear momentum of agidl4zt0hpt8p+ iia7t*-w 7v 4.00 kg point mass is changed from 6.00kg.m/s tot*7 wadp+4ti8h ivizg 7t0l-p 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its jflc 124mhd,kaj or4 .speed is increased from 2.00m/s to 4.00m/s. Which one of the follo lr44d m2,khjo1 ja.cfwing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull ao6kkx 61 )yueic2rih0 heavy suitcase of weight mga distance d along a level floor at co6 ko ekri0i21x6)hycu nstant velocity. The coefficient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power output ofc0bdfk)qs0s.ah6 n(tr 1q sp0 0.10 w to raise a block vertically at a const (pdr0 bq ) hntf6q0scs0k1sa.ant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objec4b9x 1 emetj,rnpi)l/t is released from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on the object as it falls 1.00 mto the ground, which one of the following choices best represents the amount of work done by the gravn9ej 4ex)bp im,1tr/litational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a vs-51orxz 34 m9 hkjhkheight ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the tot 1oh 43rh5s-kjx9kv mzal energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is,x f+5p.t5rgus;y b qv moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum 5f+ g. qvxrt,y 5s;bupaverage net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. I n4rid6gt mas+s-q(t; f the ball travels 15 meters, ws;is tr6 agqn4+(mt- dhat was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of diffe 3+8p9qo* ysvy d8clpmsq11oarent masses but identical kinetic energies and the three following statements. Which of the above so8laqs 8dosmy*cq p3+y19 pv1 tatements would be correct?
I. The one with the greatest mass has the greatest momentum
II. The same impulse was required to accelerate each cart from rest III. Both can do the same amount of work as they come to a stop

  06.19: A 60.0-kgball of clay is tossed vertically in the air with an/iqic rd3 l/kyz0 a-o+ initial speed ofio//r30d -qky+zc ial 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from awt by9+rq1;ag0s 8fhtn4 s kq9 flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d to the highest point of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do oa+ 0f ksg19q8b 4yrnstt h9qw;n the boy?

  02.48: An object of mass M is dropped from aheightH above the grounq-fsbf,d zvz,0t13l g0oh gn- d. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that a0- 13vbqnldo, hg fg,tz-s 0fzir resistance is negligible, what is the magnitude of the average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped fromwjp y8o5bp cobu(,r 30 aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height H/2. Whatyu c53wb porpb j(,o08 was the magnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is puls-k85.rupnjg e*c- ofled sideways until the cord makes-o fk.puesc*g8rjn- 5 an angle
θ with the vertical as shown in the figure to the right. The change in potential energy of the bob during the displacement is:

  03.49: A sled slides up a unif1fk9 c)a n1 fc25hxrzeorm incline of unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above its starting position and momentarily comes to rest. The sled then slides back down the hill. What is the sled's speed when it returns to its or9ecz1 r f1)2xchka5fniginal position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a yv/7;yooh8lypw a+ -r 10-meter ramp to 8yp/ olh- wav oyry+7;a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the total work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for thelo2ws 49 x;yt*.fierk 6.0 meter motion of the box upward along the incline. The mass of the block is tfyer42 . ;skl o9w*ixM=15 kg. Which one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each d*z d9 g*nl3otq;if a:eropped from rest from the top of a tall tower. Ball A fae *zi*lg;q3 n9t:od is dropped one second before ball B. After ball B is dropped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mav2yv-anfxy m5: 5wgu /ss M straight upward with an initial non-zero speed v. The object rises to a maximum heigv5ayu2n5/ xymf -gw:vht H above the launch point. The person now throws an object of mass 0.5M straight upward with initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20w+1:d1krc wq. rcs7ls N/m. The potential ed7lk q wc+s1:.r1s wcrnergy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What p6z5 bsx:8modb7 q,xzis the maximum speed it can impart to a 2.0z :m6b,z dob7xx85pqs-kg object ?

  

  10.31: An object of mass M sv-k6c0n 7i9ksoq8gp :je s(oytarts from rest at the bottom of a fixed incline of height H. A person decides to push the object up the incline in one of two ways with an applied force shown in the diagram. In each of the trials, the object reaches the top of the incline with speed V. How would the work done by the person on the block qky0:vons6 eocg7 (is9pk-j8 compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.