97.01: A force F directed at an angle of θ above the horizontal is used to 3:c s+9s m3m+z )qr7o hausnbjpull a crate a dics sra z3 +uqj+b73o9nm:msh) stance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which ; yp790t02.sjgz,eti t m farzis moving toward her with horizontal speed v. While bringing the ball togt2 0y .tp7fi,zt ae9 j0;smrz 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 k7k6) jyq5exv) *fdlr bilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on th 6 r5vk7yf x)qed)lbj*e wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratioht unx 9+zdn-rh+xq4efv3e4 2n on a horizontal surfacn+q hhzdx4294ve-f +etu nxr 3e for 5.00 s. 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 slides with ki . y:tiucm;7 uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strik:7u tim;y.cictly 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 td /c48iem :outhe right is exerted on a 3.0 kg block foro4/ e:tmciu8 d 5.0 s. 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 force directed to the right is exertea -g, oj*f,cv0xos,rmd8l wh-c3*kpz r:po -md on a 3.0 kg block for 5.0 s. The block was initially at rest and slides ox-o,0c jdpsp -,lc,orwa*r o v3*mk:m -z8hfgn a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initiallyf9m5klds.x4bu.v jd8 at reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one xb df4l5m 89usv.. jdkdirection 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 and gives 5 og )eu+ic7qnit kinetic energy. An hour after the fan has nu5 g7q+c e)oibeen 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 re8f( p9j( fc:t*2kyzceg5d gof 4.0 m/s,eeg* 2k (crzcdytp9 (58fg fj: 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 textbooks is on then,gyl row2h ;,6dt .wl 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, how much work does he do on the box. The box has a nll g 6w;o,ydtw.hr,2mass of 10.0 kg.

  02.32: An automobile uk )-o+ jbt6;otstai,engine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains s6kt - jta,otib) +;uoa 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 vrvxkx(q3as2 k )//9 qex(zphthe 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 9 ksrex v2/ahxpqz3 vk)( /qx(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,k1lut h7cn9yxq*q*;t; v(kzf k i lu- 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 th *9kinu, k c*uvxlq(1z lqky7 tf-;;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 straig):oss 4qmr nes8 -sf2rht road. CarA has twice the acceleration o2 erq)sssms8 fn 4:r-of Car B. After traveling 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 during the time interval of t jr9azf,0d/ ;x iu3,puls ;qkhhe a uz;ah0dpis,fx9 r uq/,;kl3 jcceleration?

  12.08: Through what distance does the object move during the time m5)h n6r4e;y dd-ovqi;q0mukinterval of the acchk;6m ddiq-q )urmoney0; 54veleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changedndy4 iduzq 5 9k23ot*+st( wsl from 6.00kg.m/s to 14.0kg.m/s in a time intervuyt stsd+ (i3524q*o9kznwdl al of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increas.v4lh* py/r , b.+31mspgkxwcp mk/nped from 2.00mb. w+4rgp1 k,pppnms3l/ vx*.mck hy/ /s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the ho)tr nrz5tfkb1p pm--xu-;l;orizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient o1t of-r upp-;xl)mtk5b;z nr -f 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 deliz w8yk p1:du-gvers a useful power output of 0.10 w to raise a blo -8gkz1dpy wu:ck 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 v s+ o:41yho d7hiu7tcsurface 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 th doh+i177 :suo 4ytvche 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 above a hard flo ee kpp0 .27ljs.:exmqor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the rel.e epq.m2j0k: s xep7lationship 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 se zb t-u g- kfed0vsno+n-/le29es a barrier ahead. If the car takes 95 meters to come to rest, what is the magnftskl nze/-n--db2+0 gvu 9 eoitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until iflwr/ g/+ns br2vr e3-t stops. If the ball travels 15 meters, what was the average net force applied whilesr 2b f /3-wr/gl+rnve it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetict bgji;8.b na) energies and the three following statements. Which of the above statements would be correcgb; .nabti8)jt?
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 tossp 6yew5 nyl.q)qlb5w. ed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches iw. l55 qe6qybn .lwyp)ts highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary c :fh4kdiwa zxiik .;)4oncrete surface. The boy, of mass M, leaves the concrete surface with spik i4waikz:d. hfx)4;eed 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 dropp+e a5fco+f.i 6nuji7 ked from aheightH above the ground. The object crashes into some soft o6nija ui7 .fke+5f+ cearth 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 .mzpa vm ru2+(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 acting on the mass during themu(vp2 rzm.a+ collision with the surface?

  96.38: A pendulum bob masst :yy2ux (bok1 mon a cord length L is pulled sideways until the cord makes any: ( uoxkt2b1y 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 incline of unknown angle. The sled, which7 bqey7efheed-dol9/*sw.n, 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 h,qsle.ed eo/n7ebf wdy-7* 9at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from. 0kuj(ayxo1ul 1l jz5 the sidewalk, along a 10-meter 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 them to t. yuuljz51lxj10k ao( he loading dock?

  12.16: A constant force F=50N (as shown in the figure) e*8 vmfaptr6/6(odu i 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 donudvea/fo66 t(m*p8ire by the force F onthe box for the motion?

  04.48: Two identical bowling balls Akg rlak: nuux q4/0v))0 r4fcx 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 mechanical energies of the tw ravc4:xu rnf00q/u )g klk4x)o balls changing?

  11.28: A person throws an object of mass M straight up 6wfy*12n yduz0l6km award with an initial non-zero speed v. The object 1mzyn u fa0d6wky*l62rises 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 air resistance.

  96.20: A force of 10 N strq vdcd*.t -) mq,r4garetches a spring that has a spring constant of 20 N/m. The potential energy stored in the sprinrmqr-a,vc4dg* dt ) q.g is:

  97.10: A compressed spring has 16 J of potential energy.nqzel7w7 oy-; What is the maximum speed it can impart to a 2.0-kg oo7l;w zqyn7 -ebject ?

  

  10.31: An object of mcawpin0+t 5v .ass M 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, pwt0v+ac5n i. 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.