97.01: A force F dir+dz ir04cgmw3jpgv 35j( sg e5ected at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the force F pvd30g43jji s5(wzc m eggr+ 5is

  97.33: A softball player catches a ball of mass m, whi0f nkvzak+ 4d,ch is moving toward her with horizontal speed v. While bringing the ball to rest, her hand mov0zkf 4, nk+vades 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 kilo ns*,xqw:+wtfu,tqv8a3ui (b gram sheet of wallboard 3 meter above the floor for 4 seconds. During t ,i:3+n*sta u qvwfxu(8wb,qthese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration of edu. nzsf u6*s,eu.5n a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreafzuu5n , ed uf*.s.e6sses 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 accelerati8pq-lo0;i 2dh ze4ofg :o ij0oon on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J t:o gid lo4j fhi;8-e02op0q zoo 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 right2svah l/nrn;k 1g3g(0mlm b 7i is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface. a l;m37l0mh s nvr(1 igk2/nbg
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net f3f4ifi,b t 0nib;k7mp orce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides itb4f7nmk ;ipib0 3 f,on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially agn*2 x.ysi (mjt reston 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 correctly describes the above situationyg .(ixsn*m2j?

  03.14: A fan blows the :hkw- q,s)5 ctkox)n, wgcam7air and gives it kinetic energy. An hour after the fan has been turt7g:k5 ) w ,c)moans ,kh-xqcwned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block 5 ++qulhlg/ zoof mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelql/go5h+z+ u leration 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 shelu8zq- 1e 6p5bo9fom9p i +t a:efpqxl7)vja i:f in the bookroom 1.3 m from the floor. If the janitor relocates the8otau ie9 q7 )p az1i: lfov5-xp je6fm+:qpb9 box to 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 kqi* v5(w2+cdi(kmoc,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 +mvq*okwik(2dc5 ci( mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box mo;zcl onxqm2b 1 /dx;bbg+(i* 5 fmzr muxk47i,ves with speed 5.00 m/s at the bottom of a ri5m z;7unkxlb,x 1bobr+gxc * 4(2 qdi mzfm;/ough, 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 to the right, a box movesf l 4*f8,td0v: xz+lgq0svjft with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to thetvx gqffl+:0 svl* tf,jd8z 04 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 qlqsel7*f0 pq3 1ye)s right, each starting 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 traveled the sq0 q13eyls p)fs*eql7ame distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the time inhy,1n /fgy-eljx;u*x * /zw+j ;myfktterval of the acceler l*t1yk;,nz x-/ yu*jjhf+mx fyg;e/wation?

  12.08: Through what distance does the object move during the tz5c: */i gdobeefp0 pt ob546rime interval of the accc:p*epdfoei /r 06 o5tzbg54beleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass isxv jv( )n;oszh;4 cl6c 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 oc4vl j6n x;)h(scv z;this time interval?

  14.11: A crate gains 36.0 J of kinetico0ab z p ss966)j(piul energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the folusp669o0pl) z(iab sjlowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal iszpeviuf3 c - 0jtby3ouih,+ yx+0r;w0 used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the fw3+- r0 t vc eopz30i,yx;+yfiubu0jhloor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward fou406o;8ei2ia qz ndqorce and delivers a useful power output of 0.10 w to raise a block vertically at a caid ;nz o280 eqi4uo6qonstant 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 surface of the d77sti3s es xsus-,3 -s8t ggdEarth, the gravitational fod8e7sgtuts3 si-s,x 73sgds -rce 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 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 fyfcf:o 1 dvf-h-z6r embc ; 1mck5;1labove a hard floor and released. Assl1d5-;; f bhmc-yvo16fc z mf k1fer:cuming 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 dr/zrt 7d.+v- lqhn;x pwiver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum tp -nvx;r.7/ql hd+wzaverage net force necessary to stop?

  00.26: A 500-gram ball 1ii/rqjy,* nbse:4tt moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net forcey1,tiqrb* /4 t eji:sn applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different m .ih:/whf nupoj2x/:8r:ccfsasses but identical kinetic energies and the three following statements. xh /:: .8hjpwcunoics/2 r:ff 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 toss;2krw.gls ikw* ff 46eed vertically in the air with an initial speed of6gwk.2l;i*s fe4rf wk 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upu6 w1l)x543sffrr+( d wqn-cphhm d3tward from a flat, stationary concrete surface. The boy, of mass Mc3(h)6 ludphd 5+3ffqnrwts x1-r4mw , 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 thef,(i zzug *vgxt+m y(m)okyy u12)*f g ground. The object crashes into some soft earth and comes to rest byymz* ztig *( uy1mo guy,xv)gffk+ ()2 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 Ho:-n hjtbf bb.46r go4 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 with gj4o 6 obrhtbn:f.-4bthe surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways u4s cux-g9 ud0khuknna- dx (--ntil the cord makes an ax-xda4 sn-g-u-u( kcn09h udkngle
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 3ed:gab 3/ w fd( znc/ojta;s5f0j4sduniform 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 when it returns to its original position ajje: 0nt d3(fg //fw5a; zs4dsbacd3ot the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-ai llo+xw;; c a.v7+wxmeter 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 car.lv;xc ++x a 7ww;laiotons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in 6wj cj+k4bpm)the figure) is applied for the 6.0 meter motion of the box upward along the incline. Twj4+kb6m pc )jhe 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 bowli9l-kik 0eev yo4(pt2d-lw* xnrpph +3 ng balls A and B are each dropped from rest from the top of a tall tower. Ballexoeh-* pwk3tp-i+ld(9k 2yrvl0 np 4 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 objprrl-e*2 jz8 /;)hc lmzq 72uzsea.d hth:wm +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 of H, to what maximum height does the object of mass 0.5M rise above the launch point? Ignore aiqw hm:l*8h) jda7 /sh;2zrz+ptmel2 .ru- cezr resistance.

  96.20: A force of 10 N stretcez45-n fm4hcb hes a spring that has a spring constant of 20 N/m. The potential energy stored in the spring m4f45- nebch zis:

  97.10: A compressed springn,en 1/nk:- t0nfb gaa has 16 J of potential energy. What is the maximum speed it can bfn1 a/:0tnk- nneag,impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixedh4f:,k0 fq 45 pw+ongs /7zwx3lnheqe 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-4 slng/exek4+3q7p nw, fh0 fq: z5hwo zero coefficient of kinetic friction between the incline and the object for both trials.