97.01: A force F direct(3et. pd.qr -uvgiz9o ed at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done bytreqo9vip g 3u .d(-.z the force F is

  97.33: A softball player catches a ball of mass m, j)p. rdjsr7x 8* n:z*vmkubd5which is moving toward her with horizontm5dvjz :s n.)kd pxr*br8j7u*al speed v. 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 laborer holds a 20 kilogrdr ynp jf.bp 8m.4;k1iy9 dro8am sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 sec.y8prboyp4d rmfk; dn9.81 ijondshow much power was expended on the wallboard?

  17.11: A 5.00 kg blr,)2l7c np2bzzo(0 s5qf af ncock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetqzcz02pnl 5of ncfr b(s)a,27ic 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 slidesiamw/8ir 4fi , with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases r w48iiifm/a,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 directed to the -z z(uti )jy3yright is exerted on a 3.0 kg block for 5.0 s. The bljuz3ziy- yt( )ock was initially at rest and slides 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 fordsfkc. tf * x0u8ue-+a l,t:xuce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest a8. k s-u tue 0+xat,ufc*x:lfdnd 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 throwshg e dj2+ ; m/g-llib0zb34as,mewml5 a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while a2lm;j 4sl5m3+/bhzgemlib -0 gwed ,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 *m(u 2 gtt.ervafter the fan has be. 2r*gtumve t(en turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instantavp:f3bg7 f1z4 z7rfe, a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.f:74b fz1r zgpafve 730 m/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 bookro8t9rai5b0 )g1r6 zihn zbc2:fw 3xzxvom 1.3 m from the floor. If 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 mass9)g0xri123:xrz6 cvw5t an zb f8hbiz of 10.0 kg.

  02.32: An automobile engine delivers 24, y+r 77m rz:xetb*yji,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintainst7 r+yi,yr:7*xz bj me 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 r igo / w-2a(ugos7vbs oib-mg/ wrb4:8ight, 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 it is being pushed directly to the left with a constant force ofF = 240N. The box, ofroo7 2i(4-ui b/m av8g-wgsgb/owbs: 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 speed 5.00 m/s/jmx9cm0t6d2ceb - ut at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to tb - /meudmc92 60jxtcthe 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()q6o r /rqgyf rest, 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 speed in terms f)y6/qg rr(qoof B?

  12.07: What is the net force acting ym0m :j6t+2 qleve9/zzhq.fb on the object during the time interval of the acceleration?q2 : e0b efj z/69+tyqlvh.zmm

  12.08: Through what distance does the objectl c y- gx6uvo7)cqinmf*5 zm49 move during the time interval of the acceleratuvm*g cx- z4)omcny 6l5f iq79ion

  12.19: The magnitude of they 5qt,hti4g0txj(ly 7 linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a gq45xy,hj ty07li t t(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 kv y 5 ja+)d/trfs6u)djinetic energy while its speed is increased from 2.00m/s to 4.00m/s. rj /as+uy)56d)jdtfv Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is/5;wycn t0 4 c+fdgjoljgnj(; used 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 suitcase is μ. The work dg0j; cjnco4n wf/ 5y(t;jldg +one by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power out96ojja*pt: g 2ov yvt+6jo/erput of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a g+vj*pjj ev /o92ttr6ao:6o y 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Ea h5qzxwg3l8k zm7sua/j:.,e srth, 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 choice za7h xs8,s/k.mgj zl5:w3eu qs 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 m,),mwl e lwim( 0wpj7l(mmi8d otionless 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 energ)7i l(,mld mmmwp w 8(jewl0i,y E of the ball and its height h above the surface?

  07.06: A 500-kg car iax3(i1ho ed e4s 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 average net force necessary to 4x3d i(ha1o eestop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformq.4uy .1cy;tus b6r waial9;rly until it stops. If the ball travels 15 meters, what was the average net force applied while it was comiqry;.syb ;l4a 9u1r.w6tiauc ng to a stop?

  02.26: Consider two laboratory cart.xsm6 pbct98gc)en 2w 7 *asw5pq/gqts of different masses but identical kinetic energies and the three following statements. Whic/7.5cqc xa9 )w 6 emq sn2*twgspb8gtph 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 wit 6:4ymvmfqh :nraxg6vt l0c.;h an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potentia6t:6vargyq0xh c4m.v;nlm :f l energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationarpz1i1 :z529l8 yymyx f l3bxghy 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 i:x8 gb m lxy9lyzh315zyf1p2work 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 fe4rm-(5 ws(fy )o ( zilg5l 90 jwd2gnc3vkxjurom aheightH above the ground. The object crashes into some kefj gwd4(2i 3gml9oz u lj -wv5(y()rsc0xn5 soft earth and comes to 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 aheight H above the ground. The oba g48fxsu5u+p aa9+5lp+jz elject 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 magnitauazx 495p fp s5eug+ 8llaj++ude 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 pulled sideways until the; ua; dds,xd5h:wrx-e cord mak:rd-5uhdxase ;; x,wd es 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. The sled, whbenot;f9 )uux )jh -4- 8tblgjich star4-bt-j tu) jo; h)ge9bfuln x8ted 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 theri e3g1 h)8 qvb*zs2mk sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the total workh m1 er)q2givbkzs8*3 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 figur (a1 qqhu2c/k;) jxfl l. hy7/afbfqi1e) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the biq.(/bfjhx lay2kq;ch /11 lfq f)ua 7lock 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 reww)vthpg51 ym6a0)mu7l-d+ v d)w iw dst 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 strd+6gpww 5dimah71u)w 0ywtml)v)vd-ikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initia/ ,3g xl1noqtml 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 ris,nxt3l/omg1q e above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spri fhi4e+ ve0tr;; s6xvrng that has a spring constant of 20 N/m. The potential energy stored in thv; frt+i 6vh4;rex e0se spring is:

  97.10: A compressed spring has 16 J of pval(3 e,agf q3otential energy. What is the maximum speed it can e(vafq3,3g a limpart to a 2.0-kg object ?

  

  10.31: An object of mass M start b(*ykk6 xv: gg9a:jfbs 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 w*gk:(v9k 6:bf axyb jgays 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.