97.01: A force F directed at an angle of θ asporr (o1 ;+7r1gxc jzbove the horizontal is used to pull a crate a distance D across a level floor. The work done byj7z 1r rscxp1( oo;+rg the force F is

  97.33: A softball plaaxi1gr(q 2-:ei)b:g9t; jzl,pr cqo ayer catches a ball of mass m, which is moving toward her with horizontal speed v. While brinxgr)a b1e:c pgiio, qr (-92jq;ltz:aging 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 kilogram sheet of wallboard 3 meter abpvt5/dj) b:r3nx xzq) ove the floor for 4 seconds. During these 4 secondshow much pow/ v5:px)j 3rbzntxd)q er was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerqe6d8i ok ( 8ka8l-asration on a horizontal surface for 5.00 s. The block’s kr 8 88(askqodal6e- kiinetic 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 slides with uniszw q ;k6n:te2nk7+edta* r w2form acceleration on a horizontal surface for 5.00 s:znaktkd w*; ee+2nqr ts6 72w. The block’s kinetic energy strictly 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 directed to the right is exerted on a 3.0fu.u5 db 3,pphflpil )p 2mg24 kg block for 5.0 s. The block was initially4.miuhl)52gplud pf3 f p,2pb 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 right is exerted on a76 m z/2fntbijvvjn1) 3.0 kg block for 5.0 s. Thev72tnv1jnfzmj/ b i) 6 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 throwsy9,8:ylhjf yr a 1 kg hammer in one direction. After the th,r jy9yhfy8:l row, the hammer moves 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 zayo 8+3:ix:mr og3.plxeh. y dxp2n2and gives it kinetic energy. An hour after the fan has been turned off, x h:rl ipd.ne2y2yx383oo zx+.gamp:
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a positdu ij)- ndr(1eion of 3.0 m, a speed of 4.0 m/sde)r1j-(ni d u, 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 mid dx.1cov2kyh.tklz 5 r0 yr4;bdle shelf in the bookroom 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 b .24rob1.yk5kr xly0zv h;d tcox. The box has a mass of 10.0 kg.

  02.32: An automobile eng6sq9gpx tc.7tine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If 9 xp6qg. stt7cthe 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 moves with speed 5.00 m/s at the p-l2diep 9;j:fh j c2ubottom 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-c pef2i hl d2jpu:;j90 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 at thenhgcdbi kt7 ))te8n2. 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 lef) thk gtdnb2.)8cein7 t 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: u mrmg9n1qj5 to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a dirnm:g m9ujq51stance 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 ne qmf(oe2zz7r8khv/v 3,3r s/ fb(uzmit force acting on the object during the time interval of the acceh/ ( 78fz3 r fko2(e/vmuzribvm, 3sqzleration?

  12.08: Through what distance does the object move during the time in d2km zedi6:pvb)y a*-b:2jdpterval of the acceleratioeja:6d:2v2 mb)kbpz*diy d-pn

  12.19: The magnitude o2xqmn5x z c+j71g zp(of the linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in thejco 7( 2mz+xgp51xqn z kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while itsm+;3bzxjd;saps97 je.s ql 17m2: 9esoer p ku speed is increased from 2.00m/s to 4.00m/s. Which one kj;77qdep2+ br eu mzs3x.ep:s 9samj1l;9soof 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 puw4bjlq)u a zpy xc z0)g/c)-e*ll a heavy suitcase of weight mga distance d aue)))* bgc/-zwqcj l 0pxaz 4ylong 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 upwar37u+6hvysr ) ztlgw; td force and delivers a useful power output of 0.10 w to rai)ulg3 t;hv7 zs+6y twrse 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 from dg(-w10psr+tylh i9e 3+i gxyrest 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 the amount of work done by the gravitational force acting on thetiegpg9d( ryls- +1h3i0y+x w Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is h*:cz vd h a3uw x3kz;pz1zz(h*eld motionless a height ho above a hard floor and released. Assuming that the collision with the flo* h:3dwc*zzpuh3;1z zzxk v a(or 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 is moving at 28 m/s. The driver sees a barriemx+tv6 7 ;w4j8pd aqshr ahead. If the car takes 95 meters tpwaq;4 h6+m8dxsv j 7to 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 uniformly d :ob*bx74apvuntil it stops. If the ball travels 15 meters, what was the average net force applied w4ob :x*dvbp a7hile it was coming to a stop?

  02.26: Consider two laboratory carts of 9c5j jt z m1;6b4xtfcydifferent masses but identical kinetic energies and the three following statem19y ; jt6fct5x4 jzbmcents. 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 ver,-a9v2uih(a epb c*vk 0mo rh4tically in the air with an initial speed of 4.6phi erh2a,-va o*04bmk(uvc90 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, stati: 7oaxvo(/;ebbg3fvnonary concrete surface. The boy, of(eanbbo of; /vx 3g7:v 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 and the concrete do on the boy?

  02.48: An object of mass M is droppedcl,t l+o8 6pkl from aheightH 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 the magnitude of the6t,cl kp8o+ll average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped fr80i: p6l yjlvlqz: mr8 xcx+-wom aheight H above the ground. The object bounces off of a horizontal surface in a collisil8vx+-pcq yi mj6xz0:lw 8:lr on 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 bobl(8ebx. zzuz- mass mon a cord length L is pulled sideways until the cord makes an an- lzzx(uz.e b8gle
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, s.j a4wwq qx)fyt3v4 4which startedx j vw.sf34w)qty4a 4q 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, alon7 pgixgf25 zik,2)fpng a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If2 pnikpgi x2,fg7)zf5 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 tdi(nxz- e i .8f t7u3hti xc9*d c)igu/ku3ty6he figure) 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 work don3txift e ki tn*(6i-39) uxuzi.u/hdc8cd7gy e by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from restw)qsc+f *ng8 c from the top of a tall tower. Ball A is dropped one second beforecc+ ngf8 s*qw) ball B. After ball B is dropped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throw;9 )zp9qu nckys 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 mass 0.5M rise above the launch pointzcpy9qk 9u );n? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constantu (bgen+zc4m7 ntiw2(e-.xe h of 20 N/m. The potential energy si(we(bzem2en- c 7g .u+hnx 4ttored in the spring is:

  97.10: A compressed sn1vjc-m3le9 d-ibu w: 93l(urh .yqhr pring has 16 J of potential energy. What is the maximum speed it can impart to a 2.0w- qrl ych uum9 39(henbdrji:.l3v-1 -kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed ino6-)ib7pnyuo k49 5dnn9bvf mcline 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, 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 coeffic 95dn9nbb n-v64y )ou i7okfmpient of kinetic friction between the incline and the object for both trials.