97.01: A force F directed at an angle of θ z -/+(g vdhx 0ion/v;rcdk(hi above the horizontal is used to pull ar-k nzd;+ g/i/0hvcx(odhi(v crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m,ufkpz-i-gk :u h7ga,m6; zp) yzum r0/ which is moving toward her with horizontal speed v. While bringiky7gzgh-kz up 6 rm0/, zu -;mf)au:ping 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 waf(-b i bk; wlvj957subllboard 3 meter above the floor for 4 seconds. During these 4 secondshow much pkj9w(-u; i7bs 5 bvfblower was expended on the wallboard?

  17.11: A 5.00 kg block slij.o sa q:wfu+sfd ,66zdes with uniform acceleration on a horizontal surface for 5.00 s.ua,q6j+f s6d .f zows: The 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 slids. xkaw:u,rh; luqjb7n )6/he es with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 :ajn)k;lbhxeh 67u uw ,r s./qJ 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 d0pi x:rhh,pgg bj-3 ;l35 tx*( bpqyvkirected to the right is exerted on a 3.0 kg block for 5.0 s. vxr3x;p0:lg3-ppghj b kyi*(tbq5 , h 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 f k pz9 vgfw1dbav/o39(orce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was inif gzk dvv9 ob1p(9/3awtially 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 atd02;ln mft 3k2br1 9umwq(goc 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 ;rw g1q2kbmofct 9dmlu(n 023the above situation?

  03.14: A fan blows the 0uejf8u;vuu- air and gives it kinetic energy. An hour after the fan has been turned off,ueu -uv8ju;f0
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass ;, obebb1oarqn46/ec 0.50 kg has a position of 3.0 m, a speed of 4. r1nb,/ob6 c4eqo;bae0 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 te qkduc /q62p(pma2b b*xtbooks is on the middle shelf in the bookroom 1.3 m from th6bqqp( a u/k*bdc22 pme floor. If the janitor relocates the 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 24,000gidf9sbj:-t nz4ec0 rwqk5/. watts (about 32 horsepower) of power to a c :0jnb ezkcsgf4r/i.w59 t q-dar's driving wheels. 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 right, a box moves with spexu4seo );c 8)4zrc7b oufll n-ed 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 ofF = 240N. The box, of mass m= 20.0 kg, has a spcr;sl4-o 8cf7xu)zo)lnbeu4 eed 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 t0 ef nlez;7yj/he 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 0;ez j lyn7/feof 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 rese27n*flm qf;z vd*(bo/ *dc cmt, along a straight road. CarA has twice the acceleration of Car B. After tfmzb* c*f;dcv(em/lo2q7 n *d raveling 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 object duringa:8ml fly*( d(0xtdql the time interval of the acceleral0lfd*lyq(x(:tm da 8tion?

  12.08: Through what distance does the object move during the tiol70sdr*peymf, t75 h 8ukl*qk if,3v me interval of the accelerati,05m7rykfv7*e 8 qt,sul*d f3kolpihon

  12.19: The magnitude of *uqcp4af mf9yhqo,5. the linear 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 q ,yhoq4ap5fm cu 9.f*this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its o*j j49/ nn ppih h1o.6d*ebawspeed is increased from 2.00m/s to 4.00m/s. Which one ofi n* bea41 p* p9njwh/6jdoh.o the following choices best represents the mass of the crate

  94.38: A force F at an aw 4 zirlucw wvneh2)+2kgp czx/r7*7 1ngle θ above the horizontal is used to pull a heavy suitcase of weight mga distangp *ei7/u)2xhrc + 4l 1rcwzkznw w27vce d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers )oly(juj+ ypxp w b5 ,jg*a5z/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. *y jup 5)(yawgj+5bxjlz, po/20 kg block?

  12.18: A 1.00 kg object is released from rest near the surfa6( kwx mv4 sxf/n7b-ku .bv3xbce 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 the gravitational force activbus37bw4 fbnxxx .( /-6kvkm ng on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a heightj04mnx+aak, o ho above a hard floor and released. Assuming that the collision with the floor isn4,k0 aj amxo+ 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 driver sees a barrier ahead. If 4n hfuk3ei (5gthe car takes 95 meters to come to rest, what is the magnitude of the minimum average netg( knf5h3 4uie force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows *7o0f dyu9hhuj9 bgo1down uniformly until it stops. If the ball travels 15 meters, o0u9u*j1d gob9 hh7fywhat was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kngt v3zr90oy2 fxel cm *+qu9)inetic energies and the three following statem yzlr0egvqcx3 *o9n+u)9t f 2ments. 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 tossen 5bf3: gcmik7d vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the chab 73fcg5 nimk:nge in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upwardiu.mo,w. ..n 1vg q(riqyei-q from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center ofv.qqiq-.gu.ni .1ym( o wre,i 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 the ground. The pdt/ nz63v2lbw, ph 8zobject crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance 2 d6z/tpb3zp,lw v8hnis 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 H abov*dd m5rb;wv:lk*sgox1 5j;d. ddl3uu e 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 a5mub1sd*kd;d5 ;vo gljdlw. *x:d 3 urverage net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways unepto +;jo. sd4til the cord makes an o ;djt eo.sp+4angle
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, which gvv 75. (2cjlx- /jvhogu3xpa started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m abo .l 3 g/7x p-2h5vgx(vaujcojvve 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 at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramp o8 1bv-i1scoec *z6tbto a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kcoi 1*c18t bsb6vze -og, 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 a s(xx5xqn(8 cmqlb(d2s3f:qcn ;xo0(as 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 besd8 q5xnf m0sxaqc3(2; :n(blqcxo( xst represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dro0pareys/ 6f+fpped 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 mechanice r/+y6p0saf fal energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with1 htu xox9- i9yja2bswh do2/4 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 spead wb9u9oj1to2y 4h sx2i/-xhed 2v. 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 10 N stretches a spuykhog *2ax8ft:x * h+zwxe,8ring that has a spring constant of 20 N/m. The poxt2hxz*xw8kay, g *f+eo :h8 utential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What iswrfpl05s:slz)xx 1c4 ug91 se the maximum speepglw9rse5x sxuc :)1z0l1f4sd it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bojf k9swl,y5g q fh631qttom 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. yf sj 61wg9k,5l3qqhf 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.