97.01: A force F directed at an angle of θ 9 qtb/lge-mc0,zgcn;above the horizontal is used to pull a crate a distance D across a leveeln cmc,q/9z;-b gg t0l floor. The work done by the force F is

  97.33: A softball player catches a ball of mass jv5nsx(nf3.hj 1na)am, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a d(j nhsx3 1nva)5fa.jn istanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds anx2jx66 qi*-h9 evbht 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During txbt6v9i6-jhhq n * xe2hese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform a vj7f 4qmpu7m. cg+6necceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time. pc7gve4nm6f.q u7m+j
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 horizoqd/ yz8 t8k7hsntal surface for 5.00 s. The block’s kinetic energy stric8z/tq skd hy78tly 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 the right is ex (2/m+i9wwbvkh -xckherted on a 3.0 kg block for 5.0 s. The block was initially at rest and mbwh2h/-c+wxiv( k9 k 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 dire5 )g5b,ozsbz wkhn: t)ru h7m2cted to the right is exerted on a 3.0 kg block for 5.0 s. The block was initiat:w r,5kbsnz2zu)hbo 75gmh) lly 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 frogs58wd9lozs* j(ga d. zen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student mjl8.zsdg9g*a 5sd o( woves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after t);sg-9t e0cm*fb u-fy3wenbrhe fan has *-- g0)w9ef uybmbfe rtc;n s3been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant , lve7e;utf b5o-6kray rj8,x, a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceler68 a7 5jovke,ret f-l,b;xr yuation of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbookua* p9dcr ca.v.dr-lg(z;(wfs is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the.( wlu;dprvada .fcgr9(* -zc 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 24,000 watts (about 32 hor1) ;lf crftia5 l108zo)njm/ bjp dyj+sepower) 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 ntjf 1)j8pmr; dz1i+afl olj)b50/ y cthe retarding force acting on the car?

  09.13: In the figure tuoa*r). gslw8x1l,r to the 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 being pushed directly to the left with a constant force ofF = lo,gl)8x *tu srr. a1w240N. 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 rig2d s 6s6ls)masht, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. s 26a6)msls dsThe 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 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 str,-q )ssx0+f0+pwec stk (sw cvaight road. CarA has twice the acceleration of Car e x s+(s,-c0w0skvftcsp)qw+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+bb aj+d7 j6fg on the object during the time interval of the +6gj+ab7b fjdacceleration?

  12.08: Through what distance does the object move duringch 9 hriak xeg57ae,;fq ,h0ss+f*v9 z the time interval of the accelerraz99, v,7i+x hes*hf q fcaehg5;0skation

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chanlkes64rvj ,l ;ged from 6.00kg.m/s to 14.0kg.m/s in a time intekl, ;vrslj46e rval 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 incp9we da1:79 *z9g fruzr8iwq xreased from 2.00m/s to 4.00m/s. Which one of the foll7fper 99u1 iwdzq:r*9ga w8zx owing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to g-qu4cb.fob7 kk0db95 x o8ufpull a 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. The work done by the -4bb9 87oqff x5ocbk0.kdugufrictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power output og+ 1hrm3 y 4w/lvr/qqlf 0.10 w tovq1 /ll4qh 3 ygr/wrm+ raise a block 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 surface of the Earth, thzt h/ x6 wn+zvz*bd)+ne 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 acting on the Earth by the 1.00 kg object during /xz)zb vt6+d zw +*hnnthe fall?

  96.18: A rubber ball is held motionless a heig0k +a8m9 ;natugbs/ny 5(huy lht 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 the8h0 /y9yuts lm+bn g5a(anu k; ball and its height h above the surface?

  07.06: A 500-kg car is moving at p7s27umwg u*k 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average w musg72*up7k net force necessary to stop?

  00.26: A 500-gram ballf n76gl-1h kvl moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net forc knf761lvl- hge applied while it was coming to a stop?

  02.26: Consider two laboratory c7 ,vvyoyt uh7.arts of different masses but identical kinetic energies and the three v,tyvhuoy7 .7following statements. 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 tossed w a2 zhdco(j+o ;ute)o8t, u.wvertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potentitwa u ,)hotcoue8.zdo2 w(; j+al energy when it reaches its highest point?

  06.20: A boy jumps from rest straightdpy3vcky) n01wye 7z7 upward from a flat, stationary concrete surface. The boy, of mass M, leavesy zvn7y7e1c k03pydw) 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 droppedeg: r vnln3j:4 from aheightH above the ground. The object crashes into some soft earth and comes to rest by come:rnv3:4gn jlpressing 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 H abov5*s)g 2q3,nd blk, )yrb:wtglf69ddzh o)h ate the ground. The object bounces ofhn )w hgdts5f:b9byq,g)o )d2 dt3 la,kl*zr6f 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 the surface?

  96.38: A pendulum bob mass mon a cord lengt( nb(ym wvh(:kh L is pulled sideways until the cord makes an angl(:( k wmhyvb(ne
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, whichp8l23t9str rw 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 cor23wl 9rt s8ptmes 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 monk4*q(7 wl6ffeujp;r ves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters rq f6f4lenjp *k;7(uwabove 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 the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for the,rcr f8qx k+2lhx/re/i7 c6v i 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Whx e/ri,k6qf cx7+ r cil/2v8rhich 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 a x3btcu/,. eg q+kzmt5re 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 grou,b3cxz5g tkt / +e.qmund, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initial non-geq ppz*2 8)io(vp cbh4 bw/ifq x./)kzero speed v. The object rises to a maximc/8zobgi x)fqv4q.p e( pbw phik*/)2um 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 stretches a spring that has a spr+1ystrh6p *l,vfk ohv/fi;,aing constant of 20 N/m. The po+f ,iys klth6rvv/poa;f1 *h,tential energy stored in the spring is:

  97.10: A compressed spring has 16 -us:iveq kga 9a z8me1e*rnu;rw ,ua22(jl5pJ of potential energy. What is the maximum speed it8ru-vwjr alee 2s:egaq1 i m92z,u5*nku(a;p can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from res- d2helw,pob(x):n zlggm/9x9j i+u s t 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 di s-+:uxj 9w il,n9)dbo 2glg/ zpmxeh(agram. 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.