97.01: A force F directed at an angle of θ abov *l5ubi5ed z,aeym9ce.kz7 +se the horizontal is used to pull a crate a distance D across a leve *a7z eecz us ,k5di+blmye95.l floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is movu0t :1 k *4: rqzh4gctortyslcn-q:y; ing toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assumtz4nq*q0t :go 4:ryc1y l: srtc;hu-king constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogran 7pf+hh78oxej(. w zom sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much wz ohojxn7 h(e8.pf7+ power was expended on the wallboard?

  17.11: A 5.00 kg block isdelrv1 (5 9me;)*ffr l jj1.xlhn.v slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decr1i; s 1mlxlelrnh 5d9..f)jjer v*(vf eases 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 hom42w 2gw:zm gdrizontal surface for 5.00 s. The block’s kinetic energy strictly decreases fromggmdwm w422z: 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 fo;l 5pxelh9m;2x j2 vu;bd cbs0rce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initl ejmx0h2du;vc2p;s;l59xbb ially 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 so7.i.jn8 ypvto the right is exerted on a 3.0 kg block for 5.0 s. The block was in v7p..on8sij yitially 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 frictione7xf .(5 crjbqless frozen pond throws a 1 kg hammer in one directionr(f xq7c5b .ej. After the throw, 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 a:7 * rkfexi:odnd gives it kinetic energy. An hour after the fan has bee rke:fxo7:*din 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, a03x3,m n rede 6v3ojty speed of 4.0 m/s, and an acceleration o e 33,n 3jvrtom6de0yxf $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks : 2cqz2o vd(cio egnn6 ;d/ve8is on the middle 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, h2cc/ ;o : zege26qdd (noinv8vow much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine dei(z )0l uejr-;mli.aq8ti 9v wwgo ;s3livers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If trw zo( ul. 0e3wis vl8-);mqa9 itjg;ihe 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 sp,)rqmb3uio0y eed 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 wib,y)oq 03u rmith 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 at the bottd d66t,.bl3by p+3emh2 v sqrq*:gn ctom of a rough, fixed inclined plane. The boxd*lt3gqp6: b26+3vthdrcme q.n ys,b 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 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 rest, along a straighh+;kezi;78 zne:*vvszvx k (nt road. CarA has twice the acceleration of Car B. After travnz+ievv7sxz;8*e: zv kk;n(heling 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*(vtc::ph s qs object during the time interval of thsc hstpvq(:* :e acceleration?

  12.08: Through what distance doe v0h2z5f3ohrdv1 jav 0s the object move during the time interval of the accelera aovr3h0zfvv52 1jh0dtion

  12.19: The magnitude of the linear momentuh3j;9e.f5tr 3o lj2cy b7ewb 0k8zio gm 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 thjfzg2cw .h byo9kr;7ej338 eb5io t0lis time interval?

  14.11: A crate gains 36.2 ix5vn j5- ggr2gm/ju48ggzq0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which qjvg2 5x2g nggm5i j/u4r8z-gone 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 pul3ed kbw 1/xxak;.fhg1io8kr 3l a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and thkbi.f 8k/rexw;1ogdxk 3h31a e suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a usefulyjq;x;:d fxmq+ e.,v cc1r8 nj/x6dyf power output of 0.10 w to raise a block vertically at a constant s,. myqc;cxxd/jf evfrx8:q;jndy +16 peed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is rel)f szlxz vc.)fg xu dv*u*4/1 vdzjk:0eased from 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 of the following choices best represents the amount of work done by t:j v)f.* ugsf k)*xz4u x1z vlzdc0/vdhe gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber bal:x/1r; fsh cbdl is held motionless 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 height h abob 1c;shr/ fxd:ve the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ah + 013mq stumcq1ka6kzm4r/hkead. If the car takes 95 meters to come to rest, what is the magnitude of the minimkk1uqs1chm6+ ta q4 mk03/rmzum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slowxd ) ybvh7txg iy9u ek)b8el8 m+v0m:d:;b:txs down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was cominu8)+t 7 : eb h 9mxldxiyxtv)y:vbd8k; 0egbm:g to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinet1t xl8,m s7rueic energies and the three following sm81xesut,l r7 tatements. 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 an728lr -ny icen initial speed of 4.60 m/s. Ignoring air resistance, what is ty8 cn-rie 72nlhe change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest qinwi2j+wz9: straight upward from a flat, 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 physicz2: w+9nqwiijal 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 the grouul)8nqq4m aijf, c b(6nd. The object crashes into some soft earth and comes to rest by compressing the earth a distance ofbn8() u 4qlfqim6j, ac 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 from aheightbi*uo, a0z4p d.yoa c2or :8yi H above the ground. The object bounces off of a horizontal zu4o2 08,orayd :bao pyi.*icsurface 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 cordylns/rnjrbet4+61v h1g 4t; .i xe.frw+lr3 t length L is pulled sideways until the cord makes an ang/ris 4f 13;6gyt.nh+vrrxjlt4.ln bet we+r1le
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, wh vj95)zvnue8nqr (m dy:e4m-qich 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 sled5( jdqn:vm m4y89 -eqvzenr)u 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, along a 10-meter(6jc b6 id/ 6wt:d yugwrns0i6 ramp to 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 it6udnri 6 :wb(6d c6/ wgjsy0them to the loading dock?

  12.16: A constant force F=50N (as show4vrzq x+ .vl2h)vj.ar8a wx /qn in the figure) is applied for the 6.0 meter motion of the box upward along the incline./)q xwj 8+h 2rxzlrv4a.q vva. 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 are eacnv0k1so)0if 1cyz hzidi4* pr/id4 i )cw, *wgh dropped from rest from the top of a tall tower. Ball A is dropped one second before bazz0dwf1iccii0p* n g, v14i)y *ho )w sd4k/irll 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 throws an object of mass M straight upwryltnsa) 9l8 9woyq t5v h*5c7ard 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 2vw 8h7n ycst 9q9r v*l)yo55alt. 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 10fvr (8 qg/vn) )fyxz)y N stretches a spring that has a spring constant of 20 N/m. The potential y)/gxfy 8)vn(v z) rfqenergy stored in the spring is:

  97.10: A compressed spring has 16 J of potential ener.b h;d f ywc9gfm9ii3*gy. What is the maximum speec dy.9gw 9ifh*3mb; ifd it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of aau9br:pj vz* 32qip0l 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,bru p3:va*lij0q p2 z9 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.