97.01: A force F directed at an angle of θ /2pddwxh * bk0.u ,wex above the horizontal is used to pull a crate a dis*0be dp2/dwxwu.xkh, tance D across a level floor. The work done by the force F is

  97.33: A softball player m. vk8jkpr i3 i3gjq:,y/amm5catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a disga3.k3,:kj /5ivjy8m ip qmmrtanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer *)+ojr2ertcz holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expendedz*rt) cr+2jo e on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontalmin o ozg03/e2 surface for 5.00 s. The block’s kinetic e30 m oin2/gezonergy strictly decreases from 50.0 J to 20.0 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 accelee8 rmt:e2 8n4ysmq /ilration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in84 2n/:te rl8eimsm qy 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 .fnarrb i.o7 +o2k- zr/;owog to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slideo +bir7n.o;z oorra 2g.w /fk-s on a horizontal 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 exerted onfa3f un f6l b:mts.q-h60gzh4 a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horiz- 6uf h.fbsz36n4hq0ftml:agontal 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 j( v-, gnnwj(xnojd5w9m; y /rnebk7. throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one directo(9bvw(n, k m; n/7dn.j rxgynejwj-5ion 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 hour a)h lb01-x rajqgh nb13fter the fan has beqn1hl-jxr1 bag 0bh) 3en turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block s8e4,t uqq:zv of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an ac sz:,ut84vqqeceleration 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 thxjdmgkg34g2.5 2oeg 6e ky *ple bookroom 1.3 m from the floor. If the janitor relocates the box to thgg34kj2* m2 xy5 o6kel.g egpde 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 24,000 watts (aboutt1 jfj4xoxs1 4 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 magnitude of the retarding force acting on the 41s x t4o1xjfjcar?

  09.13: In the figure to the right, a box movecjizfprd:2u4 z (e;;j 2zhey; s with speed 5.00 m/s at the bottom of a rough, fixed4e:j2; ph(;;uzjief2 zrz dcy 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 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 box moves with sk.p rl v502m8wsd+ey fpeed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides8pk2y5mlds0 f . vrwe+ 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 right, each starting from rest,ur otp289c6q-yx;q my:ekv8z along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distance F, what is its q-vcy6;2t8 8zkq:xupe9 ym or speed in terms of B?

  12.07: What is the net force ac+ /bfp so*06t)q0a ajwu:ww ptting on the object during the time interval of thpp t6jfow : w0qs/ 0tb+aaw*)ue acceleration?

  12.08: Through what distance does the object move during the time i 05p lx: v/rsqruoilqsuk4i4w41)qq 1nterval of the accelr4 l qi5 ukq0):qx4rv11oi/s 4uqp wsleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point 7l *rex6i r8qhmass is changed from 6.8xl7h r6re* qi00kg.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 this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its ywi/6 nblc1mrje4t ,*speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the massnc ,*be/miyw4t61j l r of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a pfgjmw* 34u:sf5 vu du4.doa8heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between th a354vfo.fpswd*g4 um uj:du8e floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts)n*gk yzeda16pk , s8d:1oavk an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant sp1pgn) *,68dyas1od k :kkv ezaeed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near tgpkanvs6+ tpj e;8mbdda2 )/ :he surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work n2pbedkm +a/sag)pd: 6;jt8v 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 gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is;js,; r fp9)3ge.xhden fvzm6 held motionless a height 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 energy E of the ball and gh;sr ne ,v; .x9ej3)mz6d fpfits height h above the surface?

  07.06: A 500-kg car is moving att(m i,js t6c-a 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to ma (tt6c,s- ijcome to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram baqnzm 6n6 pu3+2b(meiyll moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 z6ny+iq3pneum 62 m(b meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but i*+nv/ opzd f emf/;el4k6 qish8gk:n-dentical kinetic energies and the three following statements. Which of the above statements would be cok48f/e:kn/s ipqle+;d vomfg-* n z6hrrect?
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 wpgtrjv s.)in7 nc ;aoe5y8h -f:m c*;iith an initial speed of 4. nhctagryji* f8.p:vimse )5 -c7;; on60 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 a flat,ivv 2,9;tjlk v 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 poin ;,vjv2itkv9lt of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above th jp 60h4w6.fehn*ir bpcx5wu(e ground. The object crashes into some soft earth and comes to rest by compressing the earthr h6uxew (j5.b4 pc i6pfhw*0n 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 aheight H abo9i m:fm0pbxr rw-+;s 1mx7hk qve 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 during the collision with the surface?rh p90q+7-ibx; km wrmfx: sm1

  96.38: A pendulum bob mass mon a cord length L is pulr0(,p;oh:ewk z9 ofnaled sideways until the cord makes an angp aro fe(h 9o,kn;:zw0le
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 angle4ctkc-2b 9 ohf. The sled, which socft 2-b9 chk4tarted 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 at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along qyu 81 s;*3oo2mcwfwv a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk;cs wmwfq*y23 o1v8uo. 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 fithnb wev m76/ok*bt5*gure) 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 wore57t kt vbn* mw*/b6hok done by the force F onthe box for the motion?

  04.48: Two identical bowling ball-j3pbp+0 ktrfs A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is droprftk3p-b+p0 j ped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person thro.it19 - zj,7se)olktx0 rt qidws an object of mass M straight upward with an initial non-zero spee1i det,7q-sr)i 9 zoxj.k0t ltd v. The object rises to a 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 stretche-4dgr4iurnt1 :t.ys ys a spring that has a spring constant of 20 N/m. The potential energy stored in yndi s.-t yr4tgr 4:u1the spring is:

  97.10: A compressed spring has 16 J of potential energy. What ig87kjescf.g(gf- hl 8s the maximum speed it can impart to a 2.0-kg gk e.sg(gh cl8f fj87-object ?

  

  10.31: An object of mass1r 1a9nno 2;s nx6n ddjhk43gw M starts from rest at the bottom of a fixed incline of height H.g9nsrhjdk2 doa4nxn n6 ;131w 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 compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.