97.01: A force F directed at an angle of θ above the horizontal is usqgq6h1q jo/;(i-io iied to pull a crate a distance D acr ghi/ q1ij-ioiq(o q6;oss a level floor. The work done by the force F is

  97.33: A softball playey nie1a 6(fw)kr catches a ball of mass m, which is moving toward her with horizontal 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 ha(ki)ef6a1 w ynnd is

  99.14: A construction laborer holds a 20 kilogra 4togm: 3axkj2 sv;c9 ,8jqnhi.zcli1 2*accbm sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended o c 82a*3,c4cmg2kajvhqz;n .bj1 :sli o9x itcn the wallboard?

  17.11: A 5.00 kg bloc11u3t(gkq2h3 b6puq dpe2ya nz:vwb.k slides with uniform acceleration on a horizontal surface for 5.00 s. The(t16 12ke3nb qv 2aug .zh3yu:dpwpb q 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 with uq a/owk4 26fft,g7ir jniform acceleration on a horizontal surface for 5.00j2rf, o6a 7tqw/f4gk i s. 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 ex86okd kktc5-gerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontaltk8-ck5kod6 g surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net gg)da3 ezb/d:e m8r; lforce directed to the right is exerted on a 3.0 kg block for 5.0 s. The bloclg rmge;zd8e )/ad3b: k 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 restonh7c ac2j :y5bz a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which of the following ajh 7z2y 5c:cbcorrectly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hou(e65/ypwr s.o ubnru55axuo8r after the fan has bees58 xb/wuo.p6n55eo(ua urryn 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 pf dy h:o/. gzy9mdzndm+e.w +lpy00e8osition of 3.0 m, a speed of 4.0 m/s, ah.dfdg/089l opeymzy+ w.:md+eyn 0z nd 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 bookroom0:l :. n,gbugftg05bgl*r ny q-* vtvq 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.gtu:5f ngbv*qtn-lg:b,l 0q0.g*yvr 6 m from the floor, 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 (about 32 horsevv+ l-bp zuwt*)6g8sj-l ,cuy power) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitude of the retarding -u, tbj vgup l*)lwv+zy-6c8s force acting on the car?

  09.13: In the figure to the right, a box moves with s), xqjf)w 76szkd9tpa peed 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, of mass m= 20.0 kg, has a speed of 2.5kt)9dqx7 s)w6z,p ja f0 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 wiyte 4(rj9a0kqltv6*ri (lf t, th 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/ q vt i9ktrfjl6ya(te,0l(*r 4swhen 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 u1w 5;rx ezac;rest, along a straight road. CarA has twice the acceleration of Car B. Afterx;e w1acur;5 z traveling a 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 interval of wowdx j lxbku8409 h it+d)8/vthe acceleration/xi 90 hbdtd88ujxv4wol+k ) w?

  12.08: Through what distawm4me 52wr 9ygnce does the object move during the time interval of the acceleraery4 5wm2wm9 gtion

  12.19: The magnitude of the linear momentum of a 4.00 kg pointc fwxa;k8bwabtlp9+)7ucx- 0 mass is changed from 6.00kg.m/s to 14.087f;k-p w+ xau )ta0blc9bxw ckg.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 3geiitm 3o-r6pwu:5r kinetic energy while its speed is increased from 2.00m/s t op e:ir u635wmir3tg-o 4.00m/s. 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 used to pull a heaty86w0o ywb5bav)4 srvy suitcase of werosy vwy6t)8 0wb4a b5ight 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 andb 7n;1efh7nt d delivers a useful power output of 0.10 w to raise n1b7nf;h7e tda 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 fr;(bg e1awl /nd dfm:3rom rest near the surface of the Earth, the gravitational force acting on the 1.00 k:rnega bwf;1/dm3l(dg 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 the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hakr9 x33 avx z/x3fp5jsrkmj 20rd floor and released. Akxrsfmj5 zr xp 0j29/vxa3k33 ssuming 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 is moving at 28 m/s. The driver sees a barrier f odu,su4q;fy2o 9n/uhxy ,hk* s:vp, ahead. If the car takes 95 meters to come to rest, wh us,o *uspunkqv4;y h9,yoh f2xdf,:/at is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at eje ,v)m/ 1abx15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming tob 1jevxmea) /, a stop?

  02.26: Consider two laboratory carts of z5nw,qgec 471sr5juvq4v io-different masses but identical kinetic energies and the three following statements. Which of the above statements would g7 i5z5qr1sjqo44vec vnwu,-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 tn:l:3 cg.av *vy hn3mof clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, wh: vcl* m.hat:n3 yvn3gat 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, station)yeu,k3r fnae)ysplk21e3d* sl p45 iary 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 motionyed)s lyn5, ek*)3puaf k s42le3 r1pi. 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 fr cifugkil7. tz2pok dx45, ,j3om 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 the average constant force e f.kx3tjlu2p k4ci75,od,i zgxerted by the ground on the object while coming to rest?

  12.48: An object of mass M is drow z7 18vub;(v.jk vhbgpped from aheight H above the ground. The object bounces off of a h .v7k(b bwjvh; uzv1g8orizontal surface 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 length L is dn8tj6t sge*etb3 ,gov9xh6)pulled sideways until the cord makes an ang dtn eh3s8, evt6t og6*xbjg)9le
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 dct 3lzst25i po ;c;)aed+y9esled, 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 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? zd+;;l5acp2di93t et o)c sye

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramp tmnfsczvnkch 2 t;j)/i(qu2/*o a loading dock, which is 1.5 meters above the 2v qcismun)(f/k* j/nch;2zt 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 bc5gi:j z*mg*dgxntg-,v 7) c(as shown in the figure) is applied for the 6.0 meter motion of the box upw *g)zb ng7 g*:,cgvdcmtj-5xi ard 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 bowling balls A and B a( 3 rd.j-iktvdre 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 bkt. i(d3v-rd jut before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws3 zn 8wv9ck.,se0oblc)a nhj , an object of mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launccn s oka9b,3w vej. nhl,c)z80h 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 has)eczak ;mfy :7fq 5ru0 a spring constant of 20 N/m. The potential energy stored in thf):zmfayqc r7 50ku; ee spring is:

  97.10: A compressed spring has 16 J of potential energy. .2,wg( rfuuu wqiad04 What is the maximum speed ita r2u(u, iqf0u. dww4g can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixedd,6ba)z yj5::n jafbq incline 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 coefficient )djfa5qzabjy b 6n:: ,of kinetic friction between the incline and the object for both trials.