97.01: A force F directed at an angle of a2t u25aa6unoθ above the horizontal is used to pull a crate a distance D across a level floor. T6u a5uon t22aahe work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving towardxtis9,h;61p92o9lq kopp a n i her with horizontal speed v. While bringing the ball to rest,1oin9p9 xh ,sppt9lkiq 6;oa2 her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborelk5 k9oy8 aj6zr holds a 20 kilogram sheet of wallboard 3 meter above the floor 5lykao689 jzkfor 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg b*in8 9,dcit,4 h) dvrslocq:axv23uglock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetv4,dl:2rd* isva)hucit 8gnc 9, qo3 xic 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 unifo1v:k-w o -g. cxrjn;prrm acceleration on a horizontal surface for 5.00 s. The block’v -o 1gxnp-w;rkrj c:.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 force directed to the right z juvq8zcrmw,elc,+,9nf u 23 is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal ,m9u c c3uz8 lj,q2rw,fn zve+surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net fo4d u6ukv.n434fajy fc rce directed to the right is exerted on a 3.0 kg block for 5.0 s. The blod6 kvaj4f n 3fu44cu.yck 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 initially at reston a frictionless frozen pond throws aru1 b2ee-yx (*svgz ;a 1 kg hammer in one direction. After the throw, the hammer moves off in one direcsv xeb*z-ag;u(y2 r 1etion 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 giveq )7 ljimn8b;on2t gp+(vq ra)s it kinetic energy. An hour after the fan hopn2+tvrj8l( 7g q qni;)b)maas been 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 2qccp :r)fgep r*s79nqy :w9xspeed of 4.0 m/s, and pg7xcrf:n9 s r*e9wy:q2 )c qpan 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 mpl n4 z3xpvov-6+moq eyf)l1/iddle 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 tme1po fl/lo - 3qzpn4y+ vv)6xhe floor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delrv , ,sx,/rfwlivers 24,000 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 magnr ,,f/rw,sl xvitude of the retarding force acting on the car?

  09.13: In the figure to the; zz*4wrqsf )4+gmlej 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 = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen q4 mr *s+wel4z );zjfgit 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,z*v9j 0. xl3kzo -atqw;xoef 0 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhexf3l ok0ae*jzv.-twz q; o 09xn 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 prx/kxb* 9zu, starting from rest, along a straight road. CarA has twice the acceleration of Car B. After trav9k p b*/xr,zxueling 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 a04j 1 pcdzq,:( rktpxlcting on the object during the time interval of the acceltjrc ,1qzkl0( 4d: pxperation?

  12.08: Through what distance does tngtu 1izppjn9tg8 1z ;0bkqn ;*tn(j3he object move during the time interval of theptuj*n kp3j qtni; 9(; gzn1b8gtz01n acceleration

  12.19: The magnitude of the linkvi.o2 +y:bp.5k msxv ear momentum of a 4.00 kg point mass is changed fro k yv.52ki s:.+xmobvpm 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?

  14.11: A crate gains 36.0 vinw(cp8x h(/- 8 vuhiJ of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the followingi/x(c 8-vuwi8vnh h p( choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a hea7eberak9) 3evc)x0i/gbub sc 6e+9eu vy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is vg7/e) )xbueb 3kaescrc9i09ebu+e6 μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power d) *rrocz)k fw;77,de pktz,dnu79tvoutput of 0.10 w to raise a block vertically at a constant speed. At what constant speed will nfw* vr7;7 c tp e)ddku,o )kzz,r7d9tthis crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released lce+x2zvsxo x.kq;r4)sean au *9n 9. 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 gravitational force acting on the Earth by the 1.00 e9a*qux.n ;2czax4s x+ov r9n)el.ks kg object during the fall?

  96.18: A rubber ball iso7 h25.j ycd9/vrtlu,* ixzxo ywg:h/ held motionless a height ho above a hard floor and released. Assuming that the collision witxvh*.joyloi/x t927rh uc,wzg 5: d y/h 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 sees a barrier ahead. fy78 t95f x+j8wzu zm e9;k1qsczdkp; If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary t+j mfz9;8ypkxwq1uks9z 5f ct; e 78dzo stop?

  00.26: A 500-gram ball movi/* f/;sy( er,vs zplcpng at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to /, ezfpss(vy *r; /plca stop?

  02.26: Consider two laboratory carts of difykp-yf5v jc12qntv-w/n,t a 3ferent masses but identical kinetic energies and the three following statements. Which of the above statements1n 3nv2yfjqtpc/a 5 y-,v-k wt 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 ine1zv 2*dg3qb d the air with an initial speed b1dgev2d 3zq *of 4.60 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 r; q6qv(nb*fiupward from 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 to the highestr6 ;fv nqib*q( 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 maslzg7i g s,* 5w+ juu81ydrfw5bs M is dropped 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 ex+5bjwu, 5dily g zgfus*817 wrerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. ks 9dh3u5.a0 ra llz**k.psho 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 kl *rahau z.s.3l5s9ohpd*k0 on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pui:+a gknjvwh96 ya 5p:yb-a4g lled sideways until the cord mn y-pg:65ak4b +h:vaja y9gwi akes 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 sledoa,vzmu-2 p e0 ws,2ea, 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 speed when it returns to its original position at the bottom of tmo-ue,w v2a2zpeas0, he hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along d0xq3f5 p yy5(wbhhi* c- ogey00aet: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 tgiey0(h*c0pte f 3dq:a-y5ywh 5 x0obhe 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 owpgagsg;n0lj2( q r ( 2zxet6xmj 6)+applied for the 6.0 meter mxlx 2p62 rwjmg(0(qzj +et ns)6 ;aoggotion 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 done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are easi9*;a smeqqn+txt .i -sg,q8ch 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 mechani*, .89xna- stmsgq qis;+e qtical energies of the two balls changing?

  11.28: A person throws an object of mass M straigm ./iw (haweh1 z.u.cght 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 lzu.ahc/.m.wi ewh( g1 aunch point? Ignore air resistance.

  96.20: A force of 10 N m.pfcz, w+q 3xc6lk)zgi 2r-xstretches a spring that has a spring constant of 20 N/m. T-m2c. 6wlqx,3 )z+p kxfricgzhe potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of pyze7d px6ha87. zdi- fotential energy. What is the maximum speed it can impart to a 2.0-kg obj.y7ax6z e87p-i ddhfzect ?

  

  10.31: An object of mass M starts fromqj vd8x;3ilg* 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 compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trial8;j*vdqx3 gi ls.