97.01: A force F directed at an angle of θ abovtds uo6r34) kte the horizontal is used to pull a crate a distance D acrtds)okru36 t 4oss a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving f74b8 eop y4(3yc/wbgza - um3j*vpaa toward her with hoy4 ec7( a3 pz8vaub o*y/f-bj3map 4gwrizontal 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 wall1qjv pb(4qzw,6dy . yd2 18ooxnqt5ykboard 3 meter above the floor for 4 seconds. Durikj2x,n8ot1v6p bq.q5( yd 1y yowq4dzng these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides ww 1w)rzh3j,wv/i a ijtkzt0:w*rt)8tith uniform acceleration on a horizontal surface for 5.00 s. The,jj0 wvztw rt:h)8wit*)iwt z a1r3k/ 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 h,dk(/e emw ac 2ufog6;8kwwy y.;k; 5xrdwce( orizontal surface for 5.00 s. The block’s kinetic energy stricteag2y8cdxm,k (w;ckyo (/6 ;d5 rww; kuwfee. ly 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/ jdrzckax-2* -sho/waq+hn r:9s u/j the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and ss-u:xn9 jwh /r+2cd*k/qa ja /hz-sr olides 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 direct6 1z7pc2ugl nted to the right is exerted on a 3.0 kg block for 5.0 s. The block cpt 61l2nz 7guwas 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 throws a 1 ksikkz.0: r)srqexc( 4 g 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 correct:rcez sk(k0r.xq )i4s ly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An*k*3xa wf5r lw6twk4d hour after the fan has been turned of*xrfkwk l*t56a4w 3dw f,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0a6oyr v zvv6se:x5w+h: pqg 22.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acc vva r 6zw+5xovg:s6e22hy: qpeleration 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.+ akh9l7pnd1jr bx)s the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is ap7hs9 bkd+ n.x)rjl1 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 delivers0jgad kh(,ov* 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a consadv , h*og(0kjtant 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 speed 5.00 m/s at the byca,u ;1 c2mteottom 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 2.50 m/swhen it reaches the top of thecy;am ,ec t21u 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 mov, rt d4c37m7bn+tlmrckry/9 wes 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 direcr tn + kc/y7,m73 b9wd4lcmrrttly 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 straeaar3w sm z-6a.wz)z f a *vve2;n*yc:ight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distanswe.a-:) vzz *f6m* 2zw va;ynrace3ace F, what is its speed in terms of B?

  12.07: What is the net force acting on the object durinapax6m 4u+ r,m: (stgng the time interval of the acceleraxna, 4:utgmp(r+6 mastion?

  12.08: Through what distance does the object move during the time interva de ;-z-kphrc.o(tn8 bl of the accelerazb-; 8p. c(hdor-tn ektion

  12.19: The magnitude of the linear 2k zjuj 0:h5x6x6m zl( mhmmg0momentum 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 duringmz 52xmz 006x:lu6hhkmj(mjg this time interval?

  14.11: A crate gains 96ck; :aaje os36.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Whicc k;:ajea6os 9h 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 ato k3-:r vhh2o08)fflk3wcs h+ln6 hx 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.+hc06nhl f:)xok tw-hs 3 3lokhrv28f The work done by the frictional force is:

  14.31: A toy crane exerts an upward forcd(d ag23oew,re and delivers a useful power output of 0.10 w to raise a ,e(da3 ow2d grblock 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 from rest near the s1s2g(.xh;fg* cd ,wxcpes np +urface 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;+n2 xgpps. (f1xwc,csdeg*h 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 moz*t (w7db*ikjk a2ib8tionless a height ho above a hard floor and released. Assut87*(azw 2kidkbb*ji ming 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 n04apqq0o* gu 6gww5pm/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest,4pa p wngo0qwg65* uq0 what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 o3armwpr/b,94oiyu9 rfd;k;br 9 z8t m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it wrypf3r4woia;/bt9 u k ;m bdror99z,8as coming to a stop?

  02.26: Consider two laboratory carts of different7+5cxc s.o.pgfvk4ytz+jtt* masses but identical kinetic energies and the three following statements. Which of the azttjp tcfs 75 .4 ogx+*v+kc.ybove 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 withcb-mzb/)1 d fm an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in it d) /mzmb1c-bfs potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight u-xbo yrg2 93x- pvcj:zpward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of masr- 9z:j p2xgoyvc3x-bs 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 i-c5 (+otqw1 gbvh3z j rt+)ohbs dropped from aheightH above the ground. The object crashes into some soft ear+jbh b(+rzqvo 3w 1)t 5oc-ghtth 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 from aheight Hh3 0ooe d9w(rswm( :x-1rpgcv2 d)yo x 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 acting on the mass during the collision 2od0v((3x-g9xrw d) wyempr s1o ohc :with the surface?

  96.38: A pendulum bob mass mon a cord length L 1wuhk/d 3b6,mt kd) f +mcemyhw;a7+mis pulled sideways until the cord makes an angle , u63+ m w+;)7admft/hey1kk cwmhmbd
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+r8os o tcp vv5u;;5itb0bj6 b 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 c8sboc 0our ipvv;6tjtb; b5+5omes 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 car0wbzv,(i c 39lf3dotu.r 1tv jh z2/wktons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If tc j3o dz.r93f2lv0ztv/ (wh,bu1iw keach 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 (as a v(a zg/tvf72shown in the figure) is applied for the 6.0 meter mv 2 z7g(fa/vtaotion 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 force F onthe box for the motion?

  04.48: Two identical bowling balls A and Bv695 qyyy2gz+t.qep 8f+b fzi6saz: s are each dropped from rest from the top y 8z biyf5vq.pq:g2z 96sasety++ z6 fof 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 mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward wit 2k ,k7e cv4o,qzczlr+h 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 riolcq+e7r2, 4,vkzkz cse above the launch point? Ignore air resistance.

  96.20: A force of 10 N strejec*p* ;mvv*zra6(w t tches a spring that has a spring constant of 20 N/m. The potential ec* vj ; rm(a*pewt6z*vnergy stored in the spring is:

  97.10: A compressed spring has 16 J of potenky0jd0tb02.ic o ztb 6tial energy. What is the maximum speed it ca020t ky0. bzbd i6ctojn impart to a 2.0-kg object ?

  

  10.31: An object of mass Ml)bo jqz ,z:f zuv3c78gfz*g5 starts from 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 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 do:gjzcz5f ) lzg* uvzfq, o87b3ne 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.