97.01: A force F directed at an angle of θ above the horizonxlc u(2p*y c2qtal is used to pull a crate a distance D a2cxquyp(c2 *lcross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving tow064o p2s1 dyyrql;axs ard her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horidx6q1a;l4r osyspy20 zontal force exerted on the ball by her hand is

  99.14: A construction laborer h8fn),fs l(yy ayxe60y z*b q) qdu)d:yolds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow muchq8d) yu *d)eqy y,fy( af6):xnylbs z0 power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerati;zbep-/ sk1yd+l ss6g ) p/btton on a horizontal surface for 5.00 s. The block’s kinetic energy st p+-gpt sd/l;/)6by1ezksbstrictly 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 acceleration on8 hz i *6*bjk9glxtxa1 a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from* g6jzx hxit8*b al1k9 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 right is exert3 6o.ay/c1 idb r0j ov1bnc /lqwdcm)8ed on a 3.0 kg block for 5.0 s. The block was initially0vbdc jql.ic3w6ncad8o/y/) ro 1 1mb 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 force directed to the r3t 3djfp2v c8qight is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal 83vj qtpcd3f2 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 thr)jo cw3n3ity:58c4smcky .ps ows a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in tt) : pnmk4ic .5y83ocyjs3w sche other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energf n8kod9/h, zkf6*hdby. An hour after the fan has been d 8k k*dn6fobh9fhz/, 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 position of 11 o uuaup8/j3lalc*e3.0 m, a speed of 4.0 m/s, and an acceleration ofl 3e1p*1/uu uaa8olcj $1.0\; m/s^{2}$ . 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 vo 1tulu2h 1fcz- 6w-hfrom 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 b621vhc lf-owthzu u1-ox. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 waf h9mvvawyyw 2 dp*8u m.k(-r-tts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (abo-. kaw rh*dv8f (uwv-yymmp2 9ut 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed .t:bmcp d a7jw8v32ug5.00 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 beinggwcj7tb2uav.3d 8m:p 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 sxsc qj* ma3 bt*hi+d)3x.og f5peed 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 directch.)aosb3 *gm3qx+fx5 t*i dj ly 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 repzb pvku,:l gn7*y;fth()b*m st, along a straight road. CarA has twice the acceleration of Car B. After traveling a div:7)by; glt (np *hf,mupk*zb stance 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 a5sb* 0 eifewe0 +m8i3k/nyrx bcting on the object during the time interval of the*kseb80f5w 3e+ bmriey/ixn0 acceleration?

  12.08: Through what distance does the object move during the time lm6(fuo (m/*ieu390tr.c kwjri65jtu;q hbginterval of the accelerrj3(06;j6l5gm .qotei9 ufuutbim cw*(k /hration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed .,qypi jjk26x from 6 jqyixj,2k.p 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 this time interval?

  14.11: A crate gains 36 hhj/q tpml (.xz*tws4w;qn8/.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of thsq*/l/ .n 8hzx4w hwtq(t mjp;e crate

  94.38: A force F at an angle θ abov6t 9( q:v4+ eigvc0unequv qg q/o5+xpe the horizontal is used to pull a heavy suitcase of weight mga distance d along a len+x(gvqpq : u9ec465quv 0vq/ ge+ tiovel 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 delivers aejy4 s8c (dzl,s5kd,a useful power output of 0.c z,s d8jdk a,s(5yel410 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 r( jhv,t4 ;qzq-fwf xv)eleased from rest near the surface 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 represents thh-zv(fv,)4wq ; jxtqfe 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 ho5e. psi0k :cwgjo-fgggs1 1ck tw99k+ above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the w go.pgew9f -g0t+:sj51cick kk1gs9relationship 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:wsekzq. hqm9 (5j9 nw benu32. If the z.men wq(b2qhu n3599kjs:we car takes 95 meters to come to 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 slows down uniforux7i21a,uy((pksx:xp sm35cv a+ ixz mly until it stops. If the ball travels 15 meters, what was the average net force applied while it was comap(,i+(x:ix1yak x2 uxsv z53mp7cusing to a stop?

  02.26: Consider two labord kv 7hg302w qobs2rw 6 b.9ep7fi6to1vx)jb jatory carts of different masses but identical kinetic energies and the three following statements. Wh fb).2j7qv6gktj bo7vwh io2963p e0rdw s 1bxich 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 ver8,+9pm1p bgbh7z ddujtically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when p1 ,buzdghd 7j9mb8p+it reaches its highest point?

  06.20: A boy jumps from ru3,5utxuw* du est straight upward 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 motion. How much physical work did the average normal force of w*3,uuxd5t uu 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 the ground. Tf t5gc7x/kw1p co6gbxzqy5 82he 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 the magnitude of the average constant force exerted b57qpo t5f yzc1 gxcw bkx6g2/8y the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H abov onlhmbg,w)0 z 1cet7f43fuh5 e the ground. The object bounces off of a horizontal surfaceofg1c0 ,tmh37 z5h b4f eu)nlw 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?

  96.38: A pendulum bob mass mon a cord lengtnk)uh0a 9riq0au .,fa h L is pulled sideways until the cord makes an angle 0uqai. au,rn) k9 0haf
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 yk l;6r9+ uxnpjfg) r(up a uniform incline 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 momentarily comes to resf(ly; 6xug+jn) 9rp rkt. 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-iza6uts5 -mupna 8 2caxt5z3, meter ramp to a loading dock, which is 1.5 meters abo5i8zta u5u 6at2cpm, as3xzn-ve the sidewalk. 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 figure) is applied for the 6n 7 dtg/ojvz)oa*1 -if.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 o7 1dzfogi- nt)v*/ajdone by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from jb21xs x5gjk,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 stri 5kjx gsj2,1bxkes 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 3,o4fq /u cpkzan 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 upwa pk qc/fu4,o3zrd 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 Nln6kdnfrrt.s: g++;f/m. The potential energy stored in g+;t+ fl6:d kfnsnr.rthe spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum sp0/go kov6brvpx/w-9e5nq ch6gy d+l.eed it can imgk-/hrw9vyeod pn6 l5x cobg+./v 60q part to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclin8n /mxsimb+i g)0 2vnae of height H. A person decides to push the object up the incline in one of two ways with an applied+nxia 80)/ vsgimb nm2 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.