97.01: A force F directed at an angle o6/8odpyaxyjryh l06 jm2om0n xg/1 /kf θ above the horizontal is used to pull a crate a distance D across a level floor. The work done byyh ln rxmjy p01/0/okoyx8mdagj6/ 26 the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward h2u5gx4fuipjh *9u a*tifr 63ner with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleratuj5 xuug6n4if*3ia2* rht 9 fpion, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 k z /qmf4has,i3ilogram sheet of wallboard 3 meter above the a/3 4,z hmifqsfloor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accele8pjb:sa t,ov*ration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreas, 8s*aj:vbtp oes 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 b4xzx ,hhgd :z*s5sh a w4f;dnv7lmo5,lock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J ing 4mh4 5ln5 f;,sxd,howdv z7zsx: ha* 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 ;9besj/jwpa6 right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal a / 6j9jbs;wepsurface.
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 thedpvjn:,en 77f right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and7v e :,pdnfnj7 slides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initiamtw1v5g d8l)sw a;x *flly 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. Which of the following correcd wt*xv5;m)a gf s81wltly describes the above situation?

  03.14: A fan blows the air and ke a(bxdopfzq8p)h66(e 2,r(sx1b ny gives it kinetic energy. An hour after the fan pxnd)8( ,e( osrbqak1e(bp2h6fyz x6 has 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,l y6r(rxqzx)zvk *yo/ 98 uqg has a position of 3.0 m, a speed of 4.0 m/s, and /rgorkxyqu q vl xy6z*(,z98)an acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbok2w8wy - cpz 4.q+denm- eshf8oks is on the middle 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 box. The box has a zwe8d -k pwm8ey.fh+sq2c-4n mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsep*s+k i4c j+mehower) of power to a car's driving wheels. If the car maintains ae *khcmi4js+ + 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 modx kr2t,q0t1 wves 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 2.5t,10rqxkw d2t0 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 )vi6 (nosxeawx2(gl *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 6*)v2xn(aiw gx(seol 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 sua*x jhu eck)-0 ;qc6utarting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed heu0)6ju*qux;kcc-a 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 m,r.zz 3 auapqn: s.a2acting on the object during the time interval of the accelerati2:q3..uap zn aszrma,on?

  12.08: Through what distance does the object move during the 7sf( yp:jwvplii9. b;time interval of the accel.fjpbl:yw(i 7siv ;p 9eration

  12.19: The magnitude of the linry*bm)e4htad )g0:*pbm m; hgear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time in *m0ehh ra4mpb) :dy;g*g)mt bterval 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 u32id w2a-;sdrtoj o;speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best re; ; a2or -duiotsj2d3wpresents the mass of the crate

  94.38: A force F at an angle θ above the my rnu7mr2-af 01ety5az y 2ub,g)d6ohorizontal is used to pull a heavy suitcase of weight mga distance d along a level floo,dyan u7 2gao260y mr5ufyt-)1r embzr 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 and 6k2eoy rrs1 qa-v(1kndelivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 1a-rr v ykk2s6qo1(en0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, thhyjri5:),ydddp8yw g a.eose0) 50t re 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 objec .0r80at5ewgd5d,iy)o ph)ye : ydsr jt during the fall?

  96.18: A rubber ball is held motionless a : mjg*2z zza iu+*p)d-w edzy)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 energy dde-z2jz *)ip*g:u wm+y z)azE 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 barrierbhjuvp/9qy- 7i9p)9lgbwvc ( ahead. If the car t9 cvi9w/ h pubbp vlqgj-7y)9(akes 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 moving at 15 m/s slows down unifoii .c;jdd*y 3mhp,w3ne(q:whrmly until it stops. If the ball travels 15 meters, what was the average net force applied while it was co. (; qwhijdy dc,*eh3mp:wn3 iming to a stop?

  02.26: Consider two l s*n;(vxgz 9idaboratory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements would b*x(ig; dn 9szve 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 air with an initial spl3+,pz+m0 2/ lcivqwx bxykiij 45 8zleed of 4.60 m/s. Ignoring air resistance, what is 3kbp4 ili+ 5x08m w2v il lqjzcz/+x,ythe change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from restiz2q e.y4p.d;vv,xef 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 rises a distance d to the highest point of the motion. How much physical work ,fv2z4v qpex;dyei. .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 fryiox: jwe.45y -v6h5 b)fymrrom 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 constm4vy6jy)yhbx-5rw5fo . e i: rant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is 4 qpi8 5fj dc16oimpcei4 ftt73a22psdropped from aheight H above the ground. The object bounces off of a hoii mc2fappt 3 i6o2tqd8e15f4ps7c4 jrizontal 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 9q4(f xr5kh*vt mf.eitb43 q3g/czmlis pulled sideways until the cord makes an vk9f53r 3zltfic4 *mgt xhq4q./(b emangle
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 ovsogxt8gr:2 * f unknown angle. 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 slides back down the hill. What is the sled's speed when it returns to its original g*r ovx8:2s tgposition at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, alongq4l, o;a/5 tczwfle/q 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 the total work done by the deliveryman on the cartons to move them to the lo e5/,qzw /lo falt4qc;ading dock?

  12.16: A constant force F=5061z e-x v6l)i*etr8sa kl2t pyN (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 cho*rk ilexta 66eslz)ty1pv28- ices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are f87+or/ rywezeach 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 energry7z/w 8+efro ies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initial non-zb9fr s+ um)ipaf+,yd(ero 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 launch point? yui)(++pfab m r,9dfs Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant na4,m , zx*qkzof 20 N/m. The potaxqzk*, n, m4zential energy stored in the spring is:

  97.10: A compressed spring has im3a(:o q fjd:16 J of potential energy. What is the maximum speed it can impart to a 2.0 3f:dijqma: (o-kg object ?

  

  10.31: An object of mass M starts from rest at the bot4j0sp3l3 gbm 8e2h vz(j m6blttom of a fixed incline of height H. A person decides to push the mljl4b68 s 0(vjb2hm ptegz33object 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.