97.01: A force F directed at an angle of θ above the horizontal is u /coel-s+c5/v0 g jxcbsed to pull a crate a distance D across b/o- l /c5+gcxevjsc 0a level floor. The work done by the force F is

  97.33: A softball playeok3ca)jmcals ;+ +gj37d(zhzr catches a ball of mass m, which is moving toward her with horizontal speaza7docgc 3j+ms(z ;h j)kl3+ed 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 qnejq- i1.z-9gxone )20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expeq o) q1-eg9jenxnz-.i nded on the wallboard?

  17.11: A 5.00 kg block slides with uniform acco lq8 sh6h.f+xvle3 pc:g(-)xj cpj, celeration on a horizontal surface for 5.00 s. The block’s kinetic enhs6)p+3 vljf chc qp:cxj,e8o-( xlg.ergy 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 sli dx )9ik5q w2 bhmueep(df8k88duw/k0des with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50k u q898e2wd5d0kk hm(ed8iup)/xfwb.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 exerted on a 3.0 kg wyu9h3jajv* 13v1)n wehw b d;block for 5.0 s. The block was initially at rest and slides o3avnh1 j wuw;dvyej)913wb * hn 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 righi b 95b/d1wv+r+suuy3dmcyw;m e8k 8l t is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a mkd 3ciwm yu5;+rl 1y8s9e/wubd8 v+ bhorizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frou n*u:pf8wafql a)b 06zen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one d)wqfu 60:lu8* ba fanpirection 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 it kinetic energy. An hour+/m(l8frod;jhe p, fz after the fan has b( p+/e8m;r h,ozf fjdleen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 k z8,hs8 gy8ok)onth,dg has a position of 3.0 m, a speed of 4.0 m/s, andkn8t8g),so8y zo ,hhd 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 shelf in t2x vzm*h j1/ma/tl.wzhe bookroom 1.3 m from the floor. If the janlm1/t za2/.vw* h mxzjitor 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 24,000 watts (about 32 horsepower)2zh;hqj888 5jmx awy;uj udm. of power to a car's driving wheelsjjhq .8z8x2mj 8duum ;w5a ;yh. 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 figurelstk zrv .2 o3e7e,4xr ak6t4v 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 b 3e . v4la4orvs,2er7xt6kkt zeing 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 to7xf7j9 aac3cp the right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with cons7c f3 p7axj9catant 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 star)y tfi,+cuc (oting 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 traveled the same distance F, what is its speed in tfy(,ti)u+c co erms of B?

  12.07: What is the net force acting on the object during thhu,)*nw6-8vshll +.g 6s js dh;udp8 snr*zqre time interval of the accelew lp)hvzj sln 6;*h*.+s8g hr8u,-u6ddr ssqnration?

  12.08: Through what di r)9sx vs7i6justance does the object move during the time interval of the accelera9 rjxvu)s i76stion

  12.19: The magnitude of the linear momentum of o*qinz-ta whx p wn8*w40s5r2 24qdjda 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/rsd2w4hnj5wt408nqz *2 apxdiw o q*-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 3izqci(; 0l /iy6.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices beslq cii0( yz;/it represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavq9/on -pnev1t 8a5tuf t;0 qqsy 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 ts/a 90;qtft8p-nq 1qvt onue 5he frictional force is:

  14.31: A toy crane exerts an upward force and delivhdf9 g vfkznj jh2;7*0ers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what fzh9 02hvjj*dfgk7n ;constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest neat, n+evxf,q.e)is :b hr 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:sef)hv . bixq,n te,+ 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 3zjds t 4 8voihimv3/h(7. 9 au+blsyiis held motionless a 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 relations(zia l3 j.iv8hhvtd7b 9 /+mys4io3s uhip 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 v.-ueofqnq ue fr7jp. ;1;7 ai*zmn+r a barrier ahead. If thej-a7zfn f;q .rm*i1nrue; u7 veqo. p+ car takes 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 m nb sa3wdc83;foving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied whi3cnf3ds wb8 a;le it was coming to a stop?

  02.26: Consider two laboratory carts of zx.mf,m:ut 35qrwa1 f different masses but identical kinetic energief1r wm5xm,uz.qt 3af:s 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 vertically in wuwi s2l36 vszr163 gethe air with an initial speed of 4.60 3wl v6g3e6issz2 uwr1 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete smc.ym2 iy gfz0*0.3/jo tcko yurface. The boy, of mass M, leaves the concrete surface with speed v and his center o*3if0c gyytk z.mc2/oy m o.j0f 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 91z:, 3z tg zbg5lvtyarv1mm1the 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 isa:1vm v5r1l3 mt,gztb1zgz9 y 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 m4w6hm ubpn.w(fmm46v q20oks0xm7sj ass M is 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 the collision withwh26vuf m6km(70x4nms.p o bqwj4 s m0 the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideway zhr4* y gt6vcl9; zer06gbxg)s until the cord mag 0;r6cy e 6vlzz9b g)t4g*xhrkes 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 unknown angle. The sled, whicw6(ykwy:1c )7ia rbmbcn6, qrh started at the bottom of ,bi:1c yq6kr)mw bacy 6w(n 7rthe 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 at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-mes32w:i 3w+s 4/c4eo/g muusruebv t(yter ramp to a loading dock, which is 1.5 meters above sguu/c:ows23+yv/eiuwt m4 ( 34bs rethe 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 i :nc .m n5t2v-ug/iluF=50N (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.gl/tn:mn vu- i 2uc5i best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls 4abfi ,e1eo/5n;xx nu0h vo)b6 s0ls wA and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before bal4o0v n 0lafn,xb )e o5sbs6ei/1huw;x l 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 throwsx 4hw;7pi -tbsdr2+a f 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,fx-2si4 wt+hap rb7d; 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 (5kdf 93xpw hxs-rr3,6upo* rmn 2em,yzplf+ spring constant of 20 N/m. The potential energy stored in the sprp p, *m3rxn6( pzr,kos2x-lmy3du5e fw+h9 r fing is:

  97.10: A compressed spring has 16 J of po 1:kt6)vj 6exnk -k2k o2kmbfdtential energy. What is the maximum speed ikxn)- :je1kb2 vok66dkm ftk2t can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fazpnno b) e;m.2d 1yk;ixed 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. How would the work done by the person on the block compare for the two trials? Assume the same constant non- zero coefficient of kineti ynm ; b;2epkda.oz)n1c friction between the incline and the object for both trials.