97.01: A force F directed at an angle of θ above the horizh1j p.c9e/42dg6d mty1a:wc:znrb(rt lb y+montal is used to pull a crate a distance D across a level floor. Th:p b z+9t mhr(14laydy/1e c.j6m:wtgbdnc2r e work done by the force F is

  97.33: A softball plac60sowftg9v (e f 07wcf4h 9xnyer 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 decelfw 9th07wccof0xv fe4 9g6( nseration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogramp *-xtwx1+g/zz 6q qvt sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much pow6/vqz -qtw1px gx+*zter was expended on the wallboard?

  17.11: A 5.00 kg block slides with u/-q8wyv(knehct,c 8 uniform acceleration on a horizontal surface for 5.00 s. The bloe/-wkcq8 hc,8yv tn u(ck’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 unifor 8q j-k)y-zu6hf9spvim acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy k zvup)9-f8i6y jqs -hstrictly 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 rigo-k 1lt51 exqalb0sz9fw0fp- ht is exerted on a 3.0 kg block for 5.0 s. The block was initially at rex9tq 0alb0f fo-lkp1w5ze 1- sst 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 eujs*um73kfl h2;pq 73.0 kg block for 5.0 ufs7 kl7e qjpum;3h*2s. 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 thro1vvsy*a1wtf py ybe75f72u8 sws 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 corr1ftvus vb7 ay15fy*w se78p2 yectly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after theo zidq:v,o4bwxno)m )6*( xte fan has beeoem)b toxw v (d*x64,ziqn):on 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 3.0 m, a speed op; s1hjf u,k0pln0u-qf 4.0 m/s, and an acceleration ospq0k 0n pu1lf,h -j;uf $1.0\; m/s^{2}$ . 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 s*ys7;y -wavw1; xxunxyc+ r-the floor. If the janitor relocates the box to the shelf that uy*y 7cr-wav-x1ss;ywx;+ nx 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 (about 32 horsepowewy18/uheb*:sr qkkb8 r) of power to a car's driving wheelsbewb /y*8:1rkhq sk u8. If 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 righthvbgy3w1 3e7v2yp,tq +qi h0h, a box moves with speed 5.00 m/s at the bottom of a rou qy01,h7 y+e3hptgqh2vbw iv 3gh, 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 2.50 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 tov,v .-:sqsfiebcn rc k-38vx+ the right, a 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 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 the incl s83fr-cbv,vxe.cs k q +vi-n:ine.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each startin+zdkz/b,xq3s7lyqa98x jix *o( z;pymg.6fp g from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveledmjp fik8.zqzl q ;pba,zx9o6x7 +s (x*g3/yyd the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on thw. ctv-x6aus;cw e:r5 e object during the time interval of the rs -5;u cxe6v ctwaw:.acceleration?

  12.08: Through what distance does the object move during the d dzh1.nx,x dub q,m;3time interval of the,dddx3,n hq z.uxbm;1 acceleration

  12.19: The magnitude of the lin4 q fww2h7uv.bf)mr d*ear 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 the kinetic energy of the mass during w.h47 rf 2wbdmfq)uv*this time interval?

  14.11: A crate gains 36.0 J ofees gpw 4q8y h;gy6:d* kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Whi4q:w yghy pgd;s 86ee*ch 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/pxp,r odrx qn20 99n+2pmwly pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is μ. Thpm2w y /lpqdpn09x,9n+ x2rro e work done by the frictional force is:

  14.31: A toy crane exerts an upward force and m+r5 8z3ud8xvwphs6k delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg bloc8 3um+ dwr6z5spxhvk8 k?

  12.18: A 1.00 kg object is released from rp37ilzq.1qbv8jqe96w emdou3o4 v3 eest 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 9v . 16 33veqejlqp4e3 z8 bio7modqwufalls 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 motionleswc(*-k2oxr - xgn l-dp3gq 8xns a height ho above a hard floor and released. 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 heic*x8n ggdqon lx-x-3 w(2kp- rght h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver seep)7tpa7iv 4bcz/: to ks a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimk:avpp tz4 /it7) 7bocum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dow; bc* qzz4om ubdn(1t o6hnc//n uniformly until it stops. If the bal 4n/6z1h (cz/mo;*dbuntc qbol travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses 8f0uvn as7xv* j:2 qylbut identical kinetic energies and the three following statements. Which of the above statements would be cj l2:8*xf0u7vsav nqy orrect?
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 w 5z;pf72kev;s +sdhpair with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reache 7wv5p+f ;szpk2 she;ds its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stat5x 7h z2qyaf nipr)t3 -+azv7cionary concrete surface. The bzhtax5 c2na-)if7+pvq7 z3yr oy, 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?

  02.48: An object of mass M is dropped from aheightH above thhmkv-a8tch1 d;2(p4 6hzkf n o5c3: qgg5mdb ve ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance cph3b5kvm;8df:(dag kz cnh5m ht 2 4ov1g-6 qof 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 isa6 m+0acaxs0z2j6 tk9 ho z1xw 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 to a maximum height H/2. What was the magnitude of the average net force actinc1jx zta0ho66ak 2xz9 w+s0mag on the mass during the collision with the surface?

  96.38: A pendulum bob ocar9,p(a d+; lk*e qhmass mon a cord length L is pulled sideways until the cord a dk cl,*(9heqa+o;rpmakes 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 inclii7 sxi dpe+aq/cgz;39 ne 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 slpz d 3ieiq g+9;sa7xc/ed 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 fwvn5qfc+a: /ke9k nki6i3 /rsidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carn5: kk6a9f/w f/ vn3 +irkqeicton 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 showh2no8kktbfyhaj 02)vx qm5; *sto( 2bn 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 best represents the work done by the f 0 2y bf2ovk;q2*nxtshojm (8b5h)tkaorce F onthe box for the motion?

  04.48: Two identical bowling balflwf .gl 0ku.3g1(bsa ls 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 but before ball A strikes the ground, how are the mechaniugsb f l0law.1k(3.g fcal energies of the two balls changing?

  11.28: A person throws an objecdcjp781- zw)y c,h3 pb wvdkrq;qo8t0t 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 point? Ignore a wj7; phd)z,kodc 8c1yvtq0p8q- r wb3ir resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant o8k e5kffs*c(0 p bmn og9zzd*4f 20 N/m. The potential energy stored inkfzc9m8of*4dkz 0 * sn5( egpb the spring is:

  97.10: A compressed spring has 16 J of potential energy. Wp9i /q)etny p9x5- hmthat is the maximum speed it can impartpi-th n/q e9pxmt5)9y to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incli9ipv8u6bqqoo* jv/ vblj1+uy iv/0- sne 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 objec pb/ 6qv91v-yu+ vslv* 0qubo/ijo8i jt 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.