97.01: A force F directed at an angle of θ above the horizontal is used to h:z)8j ilmy8by zn0*ec7sc+ ypull a c 7*mybhelijz8) szy n 8:+y0ccrate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball k qc; -h(/d w* o+barwspq2w2qof mass m, which is moving toward her with hori2 pqwh;b/ 2a(cwd -orwkq +*qszontal 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 kilogram sheet of wallboare46sb. 0--lf j37lcv xkiifbld 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended oni lvfi -7.46-xcjbf0 ek3lbs l the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration onc, kwb1 2adbr6 a horizontal surface for 5.00 s. Th,b w61rkdab2c e 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 uniform acceleration on a horizoln4v (hgg.or,) 6ko5sdc)bbjsk(7eb34t yfwntal surface for 5.00 s. The block’s kinetic energy strictly de)fk6lobc. (hnsd(t4,5 rk 7ogy w3ge) jsb4vbcreases 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 isxz 27 (arq qxxnay-r5) exerted on a 3.0 kg block for 5.0 s.x5xr zny q) -27arxa(q The block 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 force directed to the right is exerted on a 3.0 kg aclwber uax11hs8c5 53, meb wdt-8 -jblock for 5.0 s. The block was initially at rest anr j 5w5xtbeel8,1s -ah-8 uadmwbc13cd 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 pntlay509 bx zk/t9tb-ond 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 t9a 0y95tn- /bl ktbzxother direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives iaqge7 sf q xm:74.dk1vt kinetic energy. An hour after the fan has been turned offxa177qfsv dm :k4. qge,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a posn9 2 wynhab0)mttyey3 g;37gcition of 3.0 m, a speed of 4.0 gweh0;tg93 yta)bc n3m2yyn7 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 bookroom 1.3 mh)1az8a:.jjl5 (x0 bprhpc iu from the floor. If the janitor relocates the box jphiu (b: 1jcpa 8lx.rhaz 5)0to the shelf that is 2.6 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 z9v;2amwo 5h 7txqeb z; e4/6llsg 5ky(about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (ab9l5htk 7 ab/w;qz4y5ome2 egslx;zv 6 out 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 withapwg:u r/, dr1nyk;u,2 .prno 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 ,npk:u.o,y2dpaw/ r 1 urgr;na 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 witgz5zhixa c:+;f)2dd7u p,go uh 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, hasuf+2dza c:,7oiu z;5)hdpx gg 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 mz1vvg+ d5nirb9 ,2jm from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distancen5rzvm+1,9v dmi2jg b 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 bi.* cya2:lufthe time interval of th*2cub.a l iyf:e acceleration?

  12.08: Through what distancdk;w 9rd pwq ;cuq5v z0/6v9kie does the object move during the time interval of the w6qk9d/;9w ic 5rpv0 zdu;qvkacceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is ch7vrvbwdl 31efr. 3( uganged from 6.00kg.m/s to 14.0kv re3l 3vr1(bdu f.7gwg.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 kinetic energy while its speed is increased fro4p98rmet8+zv56djamv j: w imm 2.00m/s to 4.00m/s. Which one of the followi5dm mpet jz8m4v 9r:v aj+i86wng choices best represents the mass of the crate

  94.38: A force F at an angle θ above the :8i wuugg 65uuh:tqh4 horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of fr4 q8ih:uugt:65guhuw iction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an +q)0t k s(2r*9stsl q wsphq+wupward force and delivers a useful power output of 0.1*qh +ksrstwqp 9+wql)2 sst0 (0 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 released fro-8u-ted 5pg 4p-m+yhdy0awh js0k5 agm 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 y+ -t0pk a5a- yhg s8jup5w0dh4e- dgmof 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 hard floor and rd17urd kjds1 -+0czd w bvoij9779gsaeleased.dkudi97g01v d bs1zc7a+ 7djrwj 9o-s Assuming 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 i-yszgj- u)r)ix gh+ (pr9 qf2ts 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 avep( rxf+- 9ys-zjigh)) 2tq rgurage net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until itf(t6d 4:hk vrt:p .f;rb (wmrt stops. If the ball travels 15 meters, what wasd:mt. :vptw(t(r6r;hb4k rff the average net force applied while it was coming to a stop?

  02.26: Consider two l;3xpxk j 9pu6z:,a xxwaboratory carts of different masses but identical kinetic energies and the three following statements. , xaz9p3jp 6;kxx :xwuWhich 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 s +eok)0y0 gam*e4lbuis tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring airkgu4)0 mae +ys0ob *le 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 fidf8h7vux g*h1mygq 1/-bm6 hlat, 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 didgum1 1h87dhg*hx vmq- i by/f6 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 from aheightH above the ground. The objeczk5m t 86-usr/lf9bx mt crashes into some soft ex f rks5m6-tb /z98umlarth 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 m191dr; 9ursebn*2yhjmepc g/ass M is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward tomhr* c1;ed ub1ejsy9nrpg/ 29 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 -xgl8 rv leq/j,6hm6il/ lsq2 a cord length L is pulled sideways until the cord makes an angle v-/l2eq8mjll 6/,xri q l6shg
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 -/ o5;i hd 5kihji77 :cfoat9e; ajvbua 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 rest. The sled then slides back down the hill. What is the sled's speed whef-boc5:iah hok9/j 7;t5 7;avieu dji n 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-meter ramp xgc 8)dvi+rv9z/h 7nrto a loading dock, which is 1.5 meters above 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 the)chnx78i gd v+9r rzv/m to the loading dock?

  12.16: A constant force F=50N (asn w 5cky-udldnn8-q 3: shown in the 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 n :ny u5cdn-kw- l3dq8best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling b bz)zbglqnhs sz +(z y2ji 1z,r2;,-oealls 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 ball B is dropped bun 2zzos1,zb ( -qh)ib+jzlg ;sry2e,zt before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an objw-ufg*g9:n qya- z+k-gl 2dti ect 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 2a-:qz+gtudg l9wi- -fgy*knof 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 stretches2cs1:lctnl 2)e 1qu6 iuw/rzl a spring that has a spring constant of 20 N/m. The potential energy stored in the sprinrsuc6 l) 2ll nqi1:/c21uwzt eg is:

  97.10: A compressed spring has 16 J of potential energy. What is the mab+5xj* bi eee4ximum speed it 4e*b +ij5ee bxcan impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at thx 9 zzdy)0 pb6njr3llg f55/vhe 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 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 inclinx3br5 0fzdph5 zl9g jy)v /6nle and the object for both trials.