97.01: A force F directed at/-z(ukdwq3ykpg 6 3zy an angle of θ above the horizontal is used to pull a crate a distance D across dwk6-uq3(3/ ypzzgyk a level floor. The work done by the force F is

  97.33: A softball player catches a3pen1e0qnyds*.t it yt78pi3 ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the qp13ey .*tens38nt 0ip it7ydball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 metekq14-)szxg jgr above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboa1gk- zxsq)4jg rd?

  17.11: A 5.00 kg block slg 3qyf. kb kc(eef96ui 1y3z5qides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 1fz3ceqyug k b (kieq6 3.9y5f20.0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block sifeejutz-ohb k(9 qj t3s :g8,7q2/rllides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic ene:9jkl-er/ 8i h,7jz(stqu3qgfbt2oe rgy 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 force 4zgs wpw 60 w cu792,cy)znwgzdirected to the right is exerted on a 3.0 kg block for 5.0 s. The blo 6, 72wzc)4wszzuwgc9 n0ypgwck 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 exerted on a b-.l+ez ;s c+oo2skm/+znom p 3.0 kg block for 5.0 s. pe/2on+ ; -zo+zskbcml m.o+ sThe block was 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 initia+u :iixn tp xt6o-1wc)lly at 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. Wht+1u:piti -n ) w6xxcoich of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic fpv+x r2z2rtp d sy6(1energy. An hour after the fan has bed 2rtv x p+zfsyp(62r1en turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a bloe8 +dwa+n q.yrck of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration o 8 wdr+qy.a+enf $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the mivln0+8fqnzgkb 64kr: ddle 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 boxlzk f8n vrk:g4b0 n6q+. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of kgt3t;w-e kp4 2f1l0xyaxr1u t+pd1dpower to a car's driving wheels. If the car maintpp3ax0dty+g e1kw-fk; ux1l t1r 2d4tains 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 speed 5.00 m/s am lv t,z26qvqt9a.3got the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to tq zovq6 lg,va2ttm39.he 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 lb mggf vaser4)/(l29r(,ge kbottom 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 2rmrvll4 sfeegga)g9 (k/b (,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 p:sbty/,wzt(sz+ -m frest, 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 travelt/f-mt (syzs,w p+z:bed the same distance F, what is its speed in terms of B?

  12.07: What is the -dol)+3pon8m4 2tj n,n bbgzgnet force acting on the object during the time interval of the accelerationmb,+j2 ndpnl38o)b-zntogg 4 ?

  12.08: Through what distance does the object move during the time iz5d3rwv87x - mqz7/l 13 nd+ttjphheasu3q-b nterval of the acceleratidmr+q3n3bw57 7xz dlt at 3-/8hh- vsjq 1epzuon

  12.19: The magnitude of the linear momentum of a,c)0) te2g* mzciqzrxf i0*nv 4.00 kg point mass is changed from 6.00kg.m/s to* gc0*tecn ,ziz)0im vqfrx)2 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 kinetic energy whikqg*jx c4u8z u.c2;iq1rds7 sle its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best reprgcsq8q; kr1xz47 uc uid2js *.esents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a h(i,xfsw z;l /deavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase dx(,ilfz;w/sis μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and deligw4 zvhwx:2 4mjl 1lc-v)cyhh 8ml78overs a useful power output of 0.10 wz:2lm m jcv wo8lc8)4x ygh h-1l4hw7v to 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;xir4k2x3k c u from 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 one of the following choices best represents the amount of work done by the gravic;iku24x 3 krxtational 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 floor and/ja /cac()kj2yi r1co 8/-ove0diny d releaaj2 cco/y 0vi8rck ddj-yn)1ie// (oa sed. 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 and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver s3vxrdx6pgw d o,4 xp)6ees a barrier ahead. If the car takes 95 meters to come to rest, what is the m rwpx ,vg)3opx x6d4d6agnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball mv). zneef8 *paoving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net fofv*8pa) z.neerce applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but idehfp75 ;har )qas .xc7bntical kinetic energies7 hpfx7r )abh cq;a.5s and the three following 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 v1p*3qu8-fco4c9vr qmao 7 lnnertically in the air with an initial speed of 4.60 m/s. Ignoring air recpqo13l*m79 nq4nf8- ocuv rasistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward frovzde2kz1zka tda-e; 6lqw;n.2kn( .lt )9qddm a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d towaktdnt.2dv) za qn( d2z;; 6dkz1ql.e9l-e k 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 objed f/bg.d 4nbkh ,n jwt/yu(i*+ct crashes into some soft earth ay/(j,widgn4nu.kbf h +tdb /*nd 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 dropped from aheigynoe.6v b;dqz. l 8e6x2d;vt vht H above the ground. The object bounces off of a horizontal surface in a collisi; vq nz.6e byt.d6dxev;lv 28oon 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 mkr46o0vvhrudr:t;9rsnn4wzz k , ,+ qon a cord length L is pulled sideways until the cord makes an angrv9k4vr;+ zn:0rtun, 4z hs o6 wqd,krle
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 gun 9 oo/xm)p+6w jmyi)vl62psled, 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 sm6jpvu)9l/) gy6mnio +ow2 px peed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from 1 .n6l hd/r(zsj: lx,tpd qt4zthe sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk,l:x (r . z/tsnh6zql4dtd1pj. 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 6.0 m7 7rjijfwp9 f,eter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following choices best rep ,9prfj7f7j iwresents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dro7pspo*timp yf+ :8x.f pped from rest from the to:otp mpfxsp.y8 f*i+ 7p 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 two balls changing?

  11.28: A person throws an object of mass M stw)c2acc ttgd9 8x i)je,h ;2xcnd(t6traight 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 stxxi ;6tccc 82wd t(h)2nac)gdtj9 e t,raight 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 spring constant of 20zpiv(/rk 8u-c vi .m(z N/m. The potential energym(i- ki pzc./z 8(uvvr stored in the spring is:

  97.10: A compressed spr8n-qx koo(eek.-6kv ding has 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg object eqekk6nv-d8 xo(o.k- ?

  

  10.31: An object of mass M starts from rest at th.wraf ss8 xun1pt+ t ad3*u:v(e bottom of a fixed incline of height H. A person decides tos*nu.d8 tvaax(1uw3rt :p+fs 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- zero coefficient of kinetic friction between the incline and the object for both trials.