97.01: A force F directed at an angle of θ a-nggr0qs*lkux t44c 7bove the horizontal is used to pull a craxqs0ng gru-t4l*ck4 7te a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is movib3 ;sx 5m yckg(v5oe;y 0w em9srpt*7ing toward her with horizontal speed v. Whil ;*p9yt v;7wice gb5smrm5ky0oe3(sxe 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 laborer hoa3201qwtsk f pt6i+5/ rie ha o-z5wculds a 20 kilogram sheet of wallboard 3 meter above the floorz-ktr3c0a56 tif12oe a+hiu pwq s5/w for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides w+ 0t/rhsv 8vuf 6o1m5c/g gyf with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetr/hgtf0 vfg m svw+6y81co/u5ic energy 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 sli48btsjm e .+jndes with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 Jt jm.8 4ejs+bn 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 directed to the right is exerted1p vu l *4jkfv)bh43 uo:xjp3j on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal v4 pju* vuhjj:xpkl )ob f4133surface.
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 exert790 t;agl o9w*rwwe1 bnfnb4k ed on a 3.0 kg block for 5.0 s47r9 ok0 f1wb*le a9nt;wnbgw. The 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 throws a 1 kg ha;+,zlj- drc bsh71a g+oilbya(z(lf ,mmer in one direction. After the throw, the hammer move -of lzh1gbj yzlr7adc +i(,b+l; sa,(s 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 hv ;nle,n-y o91 3u3p5uuz,a 0btbdzxit kinetic energy. An hour after the fan ht ouznxbuzn dy -lbu5p01 9va;e,33,has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a dbm pa6.7lj/lposition of 3.0 m, a speed of 4.0 m/s, and an acceleratio.d 6bmja/lpl7n 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)1h039a v yxykqgirm4 z rs*t; the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the f 3*y) g y0 tsk1q4rvrmza9xh;iloor, 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 (aboute39g7ca z4o fo 32 horsepower) of power to a car's drivfc oz9o4eg3a7 ing 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 car?

  09.13: In the figure to the right, a box lel nn.7rm7uk v,fw0bm6 cb:3moves 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 f. mvw03 lkbce6nur f:nb7lm,7 orce 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 spee pp67ei9 mq0l.+l8 kig wp su;:jvrbh;d 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with cveul:.6m0pq; 7iibk8 p9gw p;s +jlrhonstant 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,)x 5 hdb9la zkrkh0 6*t-sgir from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a dista5rzah )sh0d 9r*,b tx-6kikgl nce 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 tq .n brr,*fbw5he object during the time interval of the acceleratior5n.*, qrwfb bn?

  12.08: Through what distance does the object move during the time intervd x/nx;mpm6.v nn(s*pal of the accelexvxms/ d*n.pp;n6m( n ration

  12.19: The magnitude of the li;xdi3i ih ld.;near momentum of a 4.00 kg point mass is changed from 6. i; lid;x.3hid00kg.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 nfpi7 go/toz ny62(h; while its speed is increased from 2.00m/s to 4.00m/s. Which one of6;h7 tz onpo(in/2ygf the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull qgb:zv*n5n; ss.i98eeql j) oa heavy suitcase of weig) lqe;qzbnv8 9js5*gis n.eo:ht mga distance d along 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 and decp; 32cbk-1fr-n p.lg7bjyk vlivers a useful power output of 0.1 c2-ckrbbpgvl3 y1. 7f;n-pkj0 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released fro;b+:p4j fhj mfm rest near the surface of the Earth, the gravitational force acting on the 1.00 kg objm:hj f bfp4;+ject 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 gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor and qjk 9j9 p2xt41w:1rlkab l*sa released. Assuminl j axk krjl49pt* sw1:1baq92g 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 its height h above the surface?

  07.06: A 500-kg car zmbl0e* i2p5lj1rs. v is moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come tomj.0 bzplli ev 2*1sr5 rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slokl k 0.;d90 i yrq-7uv (xzee*pzoxk)vws down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied whilk(uzy9 l*)e dxx.peiko7-q0 v0r; vzke it was coming to a stop?

  02.26: Consider two lab8jpi 67 3 ga ljy0shs0rt:ca:toratory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements would be correct? :tc7tap80a3jisrgy :l6h 0sj
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 inithzhxqo7l7y 0vsra a558v*4pb ial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it vp hxoaa 5s* y 4l5bh8v7z07qrreaches its highest point?

  06.20: A boy jumps from rest straight ldtxc0w: nm5zljz-th0, n.k 5upward from a 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 motw,jlmnh-xlz:0tn 55 zc. t0dkion. 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 ahe81:,,fx: 5ya0nsatohllqg zes+ a8k iightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negligible, what is tagks,:xast 1hf q58+yl0 ,o l8eniza: he 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 oe7i1u)u8jyme. k*8 wtrseo,from aheight H above the ground. The object bounces off of a horizontal surface in a collision st7uo 8)jewy.ei 8m e*uko1r, 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?

  96.38: A pendulum bob m2f6 pdgmqe1s (ui fa2je)(/juass mon a cord length L is pulled sideways until the cord makes an anglp 2f/6u jqgi dmsj1uf2ae( e)(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 inera9+,bdbf m53t sq9j cline 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 momeb jq 9b9fsa 5+dm3te,rntarily 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 a 10-meter ,7mus -mi:hb(i(b34tgshcird +cw:gramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is c7gi-(mt :is+, rgid:h3wh4smc(bub 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 figur8/fut wt;h zf,e) is applied for the 6.0 meter motion of the box upward along the incline. The massw; zu8h tf/f,t 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 h34m;uc. bt) dz0ft twA 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 dropped but before ball A strikes the ground, how are the mechanical energies mt.u;th c3df bw)t0z4of the two balls changing?

  11.28: A person throws an object of mass M straight upw+u; wpnz3jim(j: s w+*kt xq9bard 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 mass 0.5M rise above the launch point? Ignore jpq tz+i39ww xn;b: (sum*j +kair resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N/m.0 q.ctp8ik+dj The potential energy stored in the .0qt+8c dpj ikspring is:

  97.10: A compressed spring has 16 J of potential energy. What is the ic wilf/ c.z,/yn6q v0maximum speed it can impart to . /il fqy06,icnw zcv/a 2.0-kg object ?

  

  10.31: An object of masr:j z3 he jfq0j,vu+t9s M starts from rest at the bottom of a fixed incline of height H.v3:+0qf,tjhe9u jr jz 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.