97.01: A force F directed at an angle of θ above the horizontt wj5zu i ehfcwh4k07+u5e1s4al is used to pull a crate a distance D aci 4ht ec7+u5z0kjwe s4h5w1ufross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moviatn1 cw+(m1ls ng toward her with 1 nstaw( mcl1+horizontal 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 wallboard 3 meter .vtv2o++a*l*enr xkmk 7+vta2n3 j ogabove the floor for 4 seconds. During these 4 secondshow much povg2rv xe .m ntjl*7o*2ka3n ++ +ktaovwer was expended on the wallboard?

  17.11: A 5.00 kg block slides wm))0y d3 selh*xkg v6vith uniform acceleration on a horizontal surface for 5.00 s. The block’s kin6 dx lmgh)s*0evy kv3)etic 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 pd8pgto*e ;7 xon a horizontal surfacd eg *p;7t8opxe for 5.00 s. The block’s kinetic energy strictly 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 forla5;eqq,. ifag e ;yv 8,lw7eyce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slilg.7f85 ye qyle; a;,iavew,q des 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 exerted on a 3.0 kg blo2i 22kza vq,f 6outxn5+: jpdrck for 5.0 s. The block w,xdo ti:q k5uf z2jn2r2+ pva6as 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 resby w4 .hobce/:ton 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 e/cbybw4ho. : the above situation?

  03.14: A fan blows the air and gives it kinetic enei,afr1 4cbdb 0rgy. An hour after the fan has beenidr ,0ba4cf1b 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 o(z:3 qwl7 yopo,t x.yzf 4zy(w,loyt qz.p x :7o3.0 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 textbooks is on the middle sh*wepgn: p50xlp(fm * z3 vz9mhelf 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 do3*wxm*fnvhl9m( ze0: gz p5pp on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 23nm5 2knaq6nqb) .wrk 4,000 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 mph), what is the magnitude of the retarding force ac w baqmnnk.3)5q26k rnting on the car?

  09.13: In the figure to the right, fk4 4x aqazpd7) knz(6a 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 k44xn()67fa pzdq kaz 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 moves with speed 5.00 m/s at the bottfxvtp,9i9m gcbu *5p2 om 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. Th f2*ic,9xv9pmb5up tge 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, eae 2q*xq1uj7clch 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 qcex72 qu1l* jtraveled 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 m. 7*rdj0lkjt interval of the aj jrt0. kd*lm7cceleration?

  12.08: Through what dis,7f mbk2 o1dzqtance does the object move during the time interval of the accel q27dfm1o,k bzeration

  12.19: The magnitude of the linear momentum of +xww 7t2mhd a7a 4.00 kg point mass is changed from 6.00kg7ta h7w2wm+d x.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 this time interval?

  14.11: A crate gains 36.0 J of kineticv 9t3nyvvu*)3af a f: t3hyf7t energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of 9ya v3ufh )yvt :t7a*tf33nfvthe crate

  94.38: A force F at an anglej-rz ev g,+y we.4bc/tgne*8i θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suigy+wi e.verj g- 84zctb *en/,tcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upwa 9xj5oph)a e,ord force and delivers 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 0.20 kg ba )jhpoo59xe, lock?

  12.18: A 1.00 kg object is released f y.3qj3p9 )ofk2hxuvqqm /5xyrom 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 onfo 92xpvjquqhk3 53 yq.)/ yxme 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 acvtw,8b* 1k ps0f ce18px:xxk 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 an,c*1f 8b8sw 1kvktp x:xp c0exd its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier8 p 3qq8ap.wfm ahead. If the car takafp8.w q3 m8pqes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15(fpxhpzlq- nrsi :-0m ,ms7k-9w l yu. m/s slows down uniformly until it stops. If the b nyhfl9 p0,pzi-7xm-s :q(ku-m rl s.wall travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but ibr,lz8; yh *sa+e (b g4swrix7dentical kinetic energies and the three following statements. Whihi7*zr+ x8e bsa rs 4l;byw(,gch 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 withkn(qpj+50r,uy7 lp( uhkw h0p an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highe5y00nk ,h lp k7qpruu(+p wh(jst point?

  06.20: A boy jumps from rest straigh2nc/q7ltjsxr-mn r-s( 1m po.s(-vxkt upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with spee(p vo (2mrqcsn.-t7-l k1sx/j ms- xnrd 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 ;ich1l 7q5* ,p1acawlh5j xv mpyl+7ddropped from aheightH above the ground. The object crashes into some soft earth 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 obje mh+l7,5vcj y17aapq5l1i dl* h;pcxwct while coming to rest?

  12.48: An object of mass M is dropped from aheight H abovj6 5/e,kt/jnuzog io/ c) ak8ee 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/ot,56/jj / kck/z8ueeni) oa g2. 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 cord length L is pulled sideways until wsf-x sq3bo fog ,5;t4the cord makefb sogq5o-t3;s4x f ,ws an 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 u i;h vhg..rlx:su8dc 7nknown 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 momentarilyl. gh:vc h xir.;s87ud 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 sidewalk3ath-m, kh zj5pp6p(u, 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 deliverypu3h5 m6,(hk zp-ap jtman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the fin1m;8f 1ifh: n -rfquagure) is applied for the 6.0 meter motion of the box upward along the incline f ;iq-h:f1unam81r fn. 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 each dropped from rest fromfvby93z , n3ly the top of a tall tower. Ball A is dropped y3 z,ny3vbf9lone 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 throj.gizyidf6l7j6 h -h;ws an object 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? j6 hz;fj. iild76h gy-Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 *0njc, q2p6 z6- - 0 6lpwgpwlnfjjyayN/m. The potential energy stored in the spring 0 gz 66j2ln pnqf0pcw-6j*lyj ,aw-ypis:

  97.10: A compressed spring has 16 J of potential energy. What is +46wzxix kc l )vre29lthe maximum speed it can el cix4rkw+v x269l)zimpart to a 2.0-kg object ?

  

  10.31: An object of mxrbuwytz9l6x)c-j *q ps*y1l8 lg g /7ass M starts from rest at the bottom of a fixed incline of height H. A person decides to push the object up the incline inqyupl)9 r szl-gl 1jc*/gx*xw6y b78 t 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- zero coefficient of kinetic friction between the incline and the object for both trials.