97.01: A force F directed at an angle of θ a*o3)jh d ;*aekwu p7yybove the horizontal is used to pull a crate a distance D across a level f3;a yyp k7 e*)dj*houwloor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which in/*y(.olt mmvfbgg s) 1 cr3tikn:0g8 s moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back tt8 .v 3gryiolk1gbg *nfm (m n:sc/0)a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer ho6jn 4l0 1qb;l7fojics lds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. o1ijc jqb;f6snl40 l7 During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides snn5ohf)-oq5;zqr 1 do d*ap* with uniform acceleration on a horizontal sudo-51d qf o;rp*5no)*qa hn szrface for 5.00 s. The block’s kinetic 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 witoy;(dh kvtlxr74 cg5 ;h uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strio;75;khl4xdtv y(gcrctly 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 dz1 8 )8.ip fv89 nqgrn5jdtuquirected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surftq g 8jqf1p r)i.zdn n98vu5u8ace.
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 exert/lsd.-:w l5 jh 8jauuced on a 3.0 kg block for 5.-slu8luah/c: j d wj5.0 s. 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 throwsmk4 wdevm:6e( a 1 kg hammer in one direction. After the throw, the hammer moves off in one direme6 m (ke4wdv:ction 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 it uy2 oya4mvqtf0x 9. 2mp*m4k ckinetic energy. An hour after the fan has ycq .mou2*m v02xp4yafkt4 m9 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 po6z;,2eosez dn-u,tt a sition of 3.0 m, a speed of 4.0 m/s, 2zo td;s- t,6eu ezna,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 bookroom 1.3 m from t:s*m9aqou.ys* 3oya the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work does 9 t3*s:saayqmou. *oyhe do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 2xpt uet/0yq :b,swzmf o02m :24,000 watts (about 32 horsepower) of power to a car's driving wheels. 0 fx , tsp/zu:2owm0e :t2myqbIf 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, u9huy .wl-9+9:er rok qaa2bva 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 aseu:.a vo rwk rh9buaqy2l9+9- 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 2.50 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 nk52m1w5rq7z ibhfk (8s:p rbat 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of fqi12:5r br7m skzp(8 nb5hkw the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the rixqk(3*:yqy*,yli r/e j v9tui ght, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling ajkei9**xvqliy/qu t(r ,y3:y distance 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 the object during the time intev bfd8 pt8(zx(rval of the acceleb(txpd88zv (f ration?

  12.08: Through what distance does the object (t(;chj8d 2qj mnzgixlr 59 q5move during the time interval of the ijq8 tc 9n h;xl5rj5z2q( m(dgacceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg n z( yh ycurtj)+5t04npoint mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the cy(4ycn)5u ztrhtj n+0 hange in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its l5qf y; tpf,.nrdu)4s speed is increased from 2.00m/s to 4.00m/s. Which one ofq)ud5lfn4rst ;.,p y f the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used x6)uxjzxrlw-7 t5ml8 dha9qb u4oti 7zn75,bto pull a heavy suitcase 97 u a6w xzqn5i 5 ltm8bu7xd)j 7bx-hlrzt4,oof 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 done by the frictional force is:

  14.31: A toy crane exerts an upward force and deln8jym x6kc-wx+2 nc i0ivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane ryj2xn+6k0 mcicw8 -xnaise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Ea y+:mehg1 c)msrth, 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 the Earth by themh)gymcs:e + 1 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho abo7 apv y . 5nt344j prqbc(7uy*7vvdqruve a hard floor and released. Assuming that the collision with the floor is elastic, which one of the f u45ytvcu7q y(3rv pvpj74*ad7b.nq rollowing 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 i1;iiz +ncqre+s 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 ne;cr ini 1+zq+ecessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down unist6h / tiz7xu0q 7be8 6n,codsformly until it stops. If the ball travels 15 meters, what was the average net force applied while 76t78bq i,/tuc hdsez0on 6x sit was coming to a stop?

  02.26: Consider two laboratory carts of different masses but ideni/r3 n.y7fir/sw 4wjbtical kinetic energies and the three following st3ij.i nyws 7w/frr4 /batements. 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 with an initibme.l+9vy qi6 8a jhx2de4aw2al speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential eneaj.8hx2yl ie9 dwm b24qv6+e argy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete sd*h 53sa,yyx;p8wooq0rac rgfl1:) p urface. 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 and the concrete do on the boy?g)* ocrpp3a0dy8srayh qo 1,lf;w :5x

  02.48: An object of mass M is dropped from aheightH above the ground. The eke0b,elt4+xdlhbc6r9q8d jec ;g0 / ix0rd 1object tdg bdle0+4ld/, x keer 10j9r;6i8ch qx0cbecrashes 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 by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped fromuto8p xjjdl+d )+7 (wlqf;q 1m aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward ) 7xlwm(fl oj81qud+;jq+dptto 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 length L is pulled sideways until thedjzytrf 1q3 o llz.vk:9*g:wu3h mq.2 cord mg3w dhkmvrq1.::3o ll zj9.*ut 2qyfzakes 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. a* **a8mkuh *lry up9vThe sled, which started at the bottom of the inh*vuk uy pa98l*mra* *cline 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,e-iciv9q5g,ozz i1,1 ihg .gh along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each g 1-,5 e19 i zggcih,zhi.qiovcarton 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)t9* oa/ot68firkrvi0s ai-s*w 3*p(fiid,ma is applied for the 6.0 meter motion *,(aim8 v3wti i9i*od/ff0i*arot6s ark -p sof 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 done by the force F onthe box for the motion?

  04.48: Two identical bowlindq50oqt a +fx 5kal5oa4 uo /fk:v.7szg balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After x/4k5lqfoqu.f7a50 vkdo5 s +aoat z: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 throws an object of mass M 4rr+ hcl;49bm h ntm5o8o-qpestraight upward with an initial non-zero speed v. 5t4 -ohbh;p 8q+ m94mnrcloe rThe 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 air resistance.

  96.20: A force of 10 N stretches a spring that h,x5l9*lojq+es t 1bq0q:jah q as a spring constant of 20 N/m. The potential ene51*ejbl:l9 oqq, 0t+qxqj hasrgy stored in the spring is:

  97.10: A compressed ;)vj q b+9 idg6.nnieo3 lds,vspring has 16 J of potential energy. What is the maximum speed it can impart togl i,ivb3s nqdjd.9 noe6) ;+v a 2.0-kg object ?

  

  10.31: An object of mass M starts frgc 4uquk) 6u9-amghg :om 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 applieu-hg6 )kq :gm94gcuaud 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.