97.01: A force F directed at an angle of h8miw0 ywe wz0y f 8 iq3ewrv5m,.e76zθ above the horizontal is used to pull a crate a distance D across a level w6w,wz f07myizm8h 3i0wy er.8 ee qv5floor. The work done by the force F is

  97.33: A softball playeatip ak*sg(r7 m3u,y)ikd /(ur catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand m /trkud7*ai (y sg3ukam)(,i poves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet ofo 7vwvkv :z 7oi5.c8yw wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow vz:.cvowv yo57w 87 kimuch power was expended on the wallboard?

  17.11: A 5.00 kg block slides with u. 24 it8cgm -fs35xwbsqin +flniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictl825w4 +m-lfc xs qgis3fbti.ny 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 slide)l ou;xq:y f2rfo)r8s s with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy sofx 8r;rf o2lu)ys) q:trictly decreases from 50.0 J to 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 direct5wesxt1u g(o- ed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and s-x1w(o5getsu lides 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 dj, p*gvlx/fha*9f 6evirected to the right is exerted on a 3.0 kg block for 5.0 s. Tvae*p96vf fjx*lg,/h he block was initially at rest and slides on a horizontal 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 throwsg0vgiy)-k 7fs a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. W gvgs0- ikf)7yhich of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour aftetos/(si i5() w,j vpuir the fan has been turned off, iis)wj/s,(5o (pvti u
what has happened to the kinetic energy of the air?

  09.05: At an instant, )((ig o *(brx bkyjvp(a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerationiy(xkr g(bo )p*j v(b( 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 1.3 m fro3r86 b,sz dw rlpkkw*mn hx )o;9)+tnwm the floor. If the janitor rr)pkw+ 3r , nt9b6mns* zxkl)o8w;dhwelocates 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 dg9 t. gxfjonuc9;k4w .elivers 24,000 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), wcn.x oj;u9k9. g4gtwfhat 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 mh v/z -7x9domn/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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.5/mod - 7zhnxv90 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 i-9s0z jx*9p 9zuxrkxright, a 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 09xkizr-* xsxzu j99 pit 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, 49wh kj3jid6 ialong a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has hji 69j d43wkispeed B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the n ,qzg 71adbpn;-xq vz2et force acting on the object during the time interval of the acceleratioqnzgqd-px7, va 1b2; zn?

  12.08: Through what distance does ttx/;vb1 v*p-h 9gzp;m h-0gti atfk6the object move during the time interval of the a g;1 / hzafv9mh6b p0i;pgtvkxt*--ttcceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is ch 61os2 b/xkcvuanged from 6.00kg.m/s to 14.0kg.m/s in a time int/u 1b2xvkcs6oerval 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 speed is icgdk9 58zs0qembf ,w36u0pxv ncreased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of t wf,ez98kvcp m0g6qbsu5 30 xdhe crate

  94.38: A force F at an angle θ above the horizontal is uscyv +,:k1jbt*0ueitf6ny c/tp)c4sqed to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitc ,bup s kjfy)y6c c1t4c:tqv* in+te0/ase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers at sud)s58d+dy useful power output of 0.10 w to raise a block vertically at a constant speed.d ds) ds8+t5yu 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 the sur( g8h35jc.xvnn :xlyv face 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 represennc:.h3x lyvjx8 ( 5vgnts 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 heigep+vz mc)27 g0w6 zeieht ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the fo026ie+zecm e7wg)vz pllowing graphs best shows the relationship between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead. If the :44p1az:m/lyifqbo,a 7ts pavuk 4)i car takes 95 meters to come to rest, what is the magnitu4aalfpviyt/z7abp1 ,4ksiu :q): om4de 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 stops. If b8uf5o uppj l7/k gt5,cr)7 unthe ball travels 15 meters, what was the average net force applied while it was coming to a ob,)pn5/p77gufu5 cjt u8lk rstop?

  02.26: Consider two laboratory carts of different masses but idercbuj1 s.8bpkp (0.xentical kinetic energies andxjb rs 1b.pp c80(uek. the three following statements. Which of the above statements 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 withug:z vaf ,jr// an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highes,:gj/v/ zua frt point?

  06.20: A boy jumps from rest straight upward from aofl4r 1 k0yza 3.i5xdi 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 5kfxz d 14o0.lriyia3 and the concrete do on the boy?

  02.48: An object of mass M is dro2hycddja vq*h(q m h5917yie2pped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance ohcjiq y9*m yedv( 752h12 adqhf 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 eryk;j ;a id(o5 c3tz5aheight 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 forcr( kjy e;oi5;53aztcde acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until the kk2 9w s+ci lw+r- esx:qrwt,*cord maker k2l: x wei *tksq-w+rsw9c+,s 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 uniform incline of unknown angle. ww4mw 7 ad) h ghbhbf6/d:p-*jThe 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 at the bottom of the hill? wfg:d)/7pbh ah4bd -m *jwh6w

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-mrvhn5 av6je 9e8d4+wfeter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kwe n54 eh9vj6+av fr8dg, 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 appliedbz2y.u s6nf yov0ww6c ;a8-lc for the 6.0 meter motion of the box upward along the w 2c6-.uyf8 avnb6cw;ylo0szincline. 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 motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from tlw.h i;cy;nmwd5)nj 7he top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped butm ;d.cl)wi7j5nwy; hn before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws*twk--l x52-ttast odqy/o x7 an object of mass M straight upward with an initial non-zero speed 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 mast5-wod-/ot- tylta2* xx 7ksqs 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring const*872of/abiqqf; cn/b lcv4 igant of 20 N/m. The potential energy stora ;ci4/g*fv72ci fqnb8q lb/oed in the spring is:

  97.10: A compressed spring has 16 e*gt*yw21,5ukfp.4:naru1q grzakl J of potential energy. What is the maximum speed itaeq4gr gntlwpy25 z1ak1:.* *k, fur u can impart to a 2.0-kg object ?

  

  10.31: An object of maue-pc v;r8)vn)3 wc kxss M starts 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, thec8 x )v)-rv;euwpnc 3k 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.