97.01: A force F directed at an angle of θ above the horizontal e a 1r.cn)vhyo0zeyhl2w e4). is used to pull a crate a distance D across aevn12rhelo.wza4 .)h0ye)cy level floor. The work done by the force F is

  97.33: A softball play; xj zvho wyggtuxx n. 9 3,5(z9gk-*,9tluvpoer catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a dis9upl xjxvt,guh3(oz* ;o z.gwn9y x,kt 5-g9vtanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 ki 0g fz2;cjxcpc)x*;e+evhw f; logram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expen;xccfe)c+; ;2hjf0x wgpev*z ded on the wallboard?

  17.11: A 5.00 kg block slides :ohirhin* y: h otm73*8q-jejwith uniform acceleration on a horizontal surface for 5.00 s. The hy:o:r*37 hqmiih j-8j* netoblock’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 uniform acceleration on a horizontal / n9nc +6;bdhg1uznpa surface for 5.00 s. The block’s ki+ ad6uhnbc9n g n/;1zpnetic 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 force directed to the right is x;vna:bfe .:lexerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a a:b.l f n:xev;horizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net forcyw9;cotxjft(d77 hpq;7 ikj *6lo 7tne directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surl(yjdjcinq7oo;f7 k7*h wt 7;6 ptx9tface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozen pond throws a 1 kg ha/mcr4gxlf- s -x:n*klmmer in k-flr -x/: g* sxlnmc4one 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 the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hoiipqc-c a5-8 qur after the fan has beenq- caiq5ic8p- turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.5;t1 yk rd1aggk70v1mi0 kg has a position of 3.0 m, a speed of 4.0 mgmt7 igak11k1ryvd 0; /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 shelf in the booavyhwm3 o;r ()kroom 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(o) rya;m3whv 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) of k ,d mj(m(v0qvs ,oug8/omm:epower to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), whaqjg v(mo,m k(e0s8m/ v: u,modt is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speeny.y :7,nxp 9uzd+mwbd 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the i9ym+,dn .punz bxy :w7ncline 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 k aw4vgym2jj7 zbo:6 j2g8(op 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the j28 6p oj2:ya4mjbog7(gwzvktop 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,e6 dsg a/h93kabxg2)yupk( :d 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 teuebgsd(6 ) /gxpayk:3k2 ah9 drms of B?

  12.07: What is the n4h 6 agog:ea6s9b 5 ,m-krqlpwet force acting on the object during the time interval of the accelerationgp 6aw lok 5qm 9,gsa6-be:rh4?

  12.08: Through what distance does the object move during qv 5 qjb-m*c,l,z v-9j sjgsbc(r(mz6 the time interval of the accelm z -vjbrs9m (b c jjs6(-*vzlg5,cq,qeration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass / c faur;xlq6k,mdw./is changed from 6.00kg.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?xdcf;qulrm// ,. kw6a

  14.11: A crate gains 36.0 J of kinetic energy whilq9 7f9z0dc hcz 2oz1ffe its speed is increased from 2.00m/s to 4.00m/s. Whic9cf9z 2 10qffz 7ocdhzh one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is r)+z d1b5p9d vzxbq ,cused to pull a heavy suitcase of weight mga distance d alongdqdz) 9p5b ,vx+ rbc1z a level floor at constant velocity. The coefficient of 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 an l 2jzd4g d8/kb,dmtx:d delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what conzbx,t/d8d kl:gj24m dstant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released f4s+pivnx0fk r*, y+t 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 reprif * t+f+x0vrs4pn,ykesents 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 helfxv5izg4t nn;/t l-0g z h:o6mvltj,)d 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 relationship between the total energyo it/, 4v:jlfn z0l;xnv6zt)-g5 mhtg 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 a wq*57ih lz e*hbarrier ahead. If the car takes 95 meters to come to rest, what is t5le* i *zwh7hqhe magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops.:hm c4erll3,iyg z 3b: If the ball travels 15 meters, what was the average nehz lm: ,ir334y:lbec gt force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differen+.wo94q qatz zt masses but identical kinetic energies and the three following statements. Which of the above statemen9aqq .wt z+o4zts 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 ai1)jfq. a,4s vkarhnoew nz/44xg3 hd *r with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its higheso jk f1)a n s3/q4wazv*nhhxr.g ed4,4t point?

  06.20: A boy jumps from r/kkv vj.f ;x,test straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass risx.jkvtf /v ,k;es 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 the g*qm/lmcw)db ,7 hjun*round. 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 t)b *mcd/* wunm7,lqhj he object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. Th2fp4)0j q omrnaok.o,hskv ; 3e object bm3hp rko4saon ,.qf;o 2kj0v) ounces 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 with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulustm,9d)d( 3 ocz ckk3led sideways until the cord mak9kd(z3dusk t3o,m)cc es 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 gej2d) 21ec7b e)frzcangle. 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 momentarily comes to rest. The sled then sld27 f)c1z)re gcb2e jeides 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 9ta2jugr sf61z ,ry)h 10-meter ramp to a f 2g )9ru1,sjth6arzy 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 the loading dock?

  12.16: A constant force ln-zhotu57zz/s) o :mF=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 best represents the work d )lhz7tuz : zs/5-nomoone by the force F onthe box for the motion?

  04.48: Two identical bowling balls A anu02vd2j2k nzo d 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 enerznkj 2vdo0 22ugies of the two balls changing?

  11.28: A person throws an object.fe ca6tmqv2q3gtr , 8 of mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H abo3.r2 et 6g8am qtqvc,fve 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 spring constant of 4rlckih)6 ;d0u*jj ig 20 N/m. T4)j0kr u iljh;cd6g *ihe potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the max1kn+2 ,e2q.cwt4d6d t jwftuximum speed it can + 2tcdf 461j2u ww,.kqetntdximpart to a 2.0-kg object ?

  

  10.31: An object of mass M startv1 01fhj o)h9,zx cmdgrt a9(ss 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, the object reaches the top of the incline with speed V. How would the work done by the person on the block comp9hx0vrj cz)s mth,91( gfdao1are for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.