97.01: A force F directed at an angle of. jk;bwigff; ; θ above the horizontal is used to pull a crate a distance D across a level floj b f;fi;;wk.gor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving t(4-d)a zl1jf/ b*dx aakdkiq /zk+g6 toward her with horizontal speed j1kxad-a(z )/ kd lkf/izb d6a+4qt*gv. 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 constructiosg;g-+/iy wr ylc9uq8n laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expendedc8ry ;lsi- w9/q ugg+y on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on46 pq 38q n2q.gg:bp3ex vkjyt a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thiqyvetp gk34 2p6x. jqn8qb3g:s time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg blocsm*i. 1ppvug:m:mpk 4r7 sc, ck9 eri:k slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J s1:kgr,prccm:k 4.9pspe * ivm m: ui7to 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 exer/* ffevd p963 .v8p0vkw4p qzoc eh9cpted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a h vve.oe3qf4p/c pd6pk9 90 zwc*fpv8horizontal 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 tx(b y 61fj7,:nujj htzo the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizo zuny(jf:hjbt1 j6x ,7ntal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozen pond throzd;r w- ((3cvw0jdej t t/d:kd8s;zmows a 1 kg hammer in one direcj:js(t;3odtez8-c w w(/;dzmdv d 0krtion. After the throw, the 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 gu-vchijf(ik7e0ny. 2n iy* i:ebp )l+ives it kinetic energy. An hour after the fan has been tn: i-*fbh7+i iku elen0iy . c2pv()yjurned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg 1uzy,ps fqbpf.akdy 5d*::i9has a position of 3.0 m, a speed of 4.0 m:zd1qb5pp: f.idu9ay sky,*f /s, and an acceleration 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 shelf in the bookroom ,61wgif zy 7jfx9rp1r1.3 m from the floor. If6yfw9g r1p7ji1xrz, f the janitor relocates the box to the shelf that is 2.6 m 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,q4il:6:- kon + /jgdjkc.txjz 000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the mj.g zt6xkqdnk:j 4lo/:c+i j-agnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with snz 20vlejoyo*o41 m *:.b34u amecnqepeed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accelera oy4.e1jmz*c e e4nu:n*vo qm3 o2lb0ation 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 right, a bk4wnj+z2t.ainff ;9 box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the t;in b2wf ak.j+4 fznt9op of the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each.zxxm od6 qy1nnf:gjz9r5 t:0 starting from rest, along a straight road. CarA has twice the acceleration of Car B. A5 6 0dronnx:9mtf qzxg1jz: y.fter traveling a distance F, 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 acting on the object during the time in e7hrx )o: bn2j+yxw7vterval of the acceleratioeb j:vr2xwx nohy7 )+7n?

  12.08: Through what distance does the object move during the tyb/07ctyooad* sd 73vzuj 02*lji l v-ime interval of the acceleratvy*du7loiza y7j-c *30j 2ls0botv /dion

  12.19: The magnitude of the linear momentum of a 4.00 kg point maskcvz yiu:(s, 2s is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic energy of the mass during,:c(2 yvi uzks this time interval?

  14.11: A crate gains 36.0 J of kinetic ene+i *q1nxnc3 crrgy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choicesccqn31nx i+*r best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is ede7w e u()m8 i4moc/+8zdetq used to pull a heavy suitcase of weight mga distance d along4ezmq m ctdoi8u7w)d(eee 8/ + a level floor at constant 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 andi)u c)-2 rmr/z 40ytz aw/fjcg delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 k/0 um/ctcf2-g rijz )r)ay4wz g block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, thek/e- kn **bov djda6w9 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, ko dw /9d-6b*aj n*ekvwhich one of the following choices best represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a heightr,vk y( +vhc+i 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 total enerh +(,ivcvryk+ gy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The dr m;eu65(rawdsmc6 akz6g.v1uiver sees a barrier ahead. If the car takes 95 meters to come to rest, wkse (cz ;u56v16mgu wad amr.6hat is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it sto20ndmxn x.yr c7e(6h gps. If the ball travels 15 meters, what was the average net force applied .cdg rhxe7 ny6(2nmx0while it was coming to a stop?

  02.26: Consider two laboratory carts of differfkv7b q6 h/:thent masses but identical kinetic energies and the three following statements. Which of the above statements would be correct7:bkhhf /v 6qt?
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;qy0l(e6ovn1 mn /yns0r cjp/ initial speed of 4.60 m/s. Ignoring air resistance, what is / vyyc1l /osr 60nqp (;j0nnmethe change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary conc2m8n96r tfm+d9lma kfrete 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 forc2 8+mnf m9ld6at rkfm9e of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped fkljpod +61x 4z8igqn 7rom aheightH above the ground. The object crashes into some soft earth and comes to 4 nq6ljpzko8+7gxd1 i rest by compressing the earth a distance of H/2. Assuming that air 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 from ahevaq* otmfy 5s;5m ld92ight 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. What was the magnitude of the average net force acting on the mass du2 9*ml;5fya5 vdotmsqring the collision with the surface?

  96.38: A pendulum bobmtpqe-n7 8bqf:x w/y4 mass mon a cord length L is pulled sideways until the cord makes an angl8bt m4q: n-fweyp x7q/e
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 uniform incline of unknown angle. p 3gg84codkn/ 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 original position atog 34 cpkdn8g/ the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, alongv3 7nyqextfk +r+i5 5b a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 2++t73rx5 fbkqn eviy 55 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 i pl d dg5/yd82ch.ya3tn the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following choices best represents the work done by the force F onthe box for the motiy.py3/d2lcd8 a5ghdt on?

  04.48: Two identical bowling balls A and B are 0z(s.vfhk ae*:n;b vn each dropped from rest from the tve.v 0fnzhk*;ns( a:bop of a tall tower. Ball A 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 ojg9g pkk7;x ;fu/cj (object of mass M straight upward with an initial non-zero speed v. The object rises to j(jkcxk7/ p;gu ;gfo9a maximum height 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 20 Noww5efvab jqh8,dl+0u j(+y 5 /m. The potential energy stored in the sprinfw8hdyua(v+ +q 5 b5,0jojlw eg is:

  97.10: A compressed spring has 16 J of potential enpy:npm/6dvqz 6 ,i*vy ergy. What is the maximum speepp*mv6/y , z6dvinqy:d it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at tf(hk8f.o4 re :ype h*zhe 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 doney k48z fr*: ho(hefep. by the person on the block compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.