97.01: A force F directed at an angle of θys :ab+2ee;xf5vxh1/c sjqe 1 above the horizontal is used to pull a crate a distance D acrossecf:a1;+e/ x2qh s5 exjsvy1b a level floor. The work done by the force F is

  97.33: A softball player catches a jjl +4yk/ p/*rcwzhm)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 horijjlz+ w4h/ckp/)*y m rzontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilozgxem xw6o7(/).ir hrgram sheet of wallboard 3 meter above the flo (miez)r/6o 7xrw .ghxor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform achwx 5w:- edo3fj0y( t,y v0wlsceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thisj 350thy0 w,s-yvwxfleo w d(: time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniformu2uo817xg 7eis*5u w c n;gxtd acceleration on a horizontal surface for 5.00 s. The block’s kinetic ene;*c8 1wo ui7dx geuu52sxt7 gnrgy 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 p/ jje(bo 6eq8h z 9z.)dittd.is exerted on a 3.0 kg block for 5.0 s. The block was initially at ret.tdbq96 ip o.jzee /) 8dh(zjst 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 ri swx.:ba3 abkx(x021a.zuuubght is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface.kaub zaax xu 1 (bub3:..sw0x2
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initiv tg ygki+mq :.ov)r- ,4hurg/ally at reston a frictionless frozen pond throws a 1 kg hamm okq -, +gut.rh4)ymviv:gg r/er 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 correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. A mdop/3ov( y*vn hour after the fan has (3dm /vpvoo*y 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 poqqpfgmjg8 uv2)/ +yx8 sition of 3.0 m, a speed ogvjq xu/m) q88g 2pyf+f 4.0 m/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 texf90ye9j qkri( bfv36iw3ic h 6tbooks 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 2ryf h(3 36qicj9fw ib0k69 eiv.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 deliver;a85q 8 cbqzngs 24,000 watts (about 32 horsepower) of power t 8zc5bagqqn; 8o a car's driving wheels. 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 figure to the /+yo)q gwdv (tjv0i2t 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 0qjt/ )i2ot dv(vy wg+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 botlp):*9q hanpp/;n s4 b ccsih,,zy lj6tom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly ipa cz:s)/ j9 lp,hs;,hnnpc4*ybql6to 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 starting from rest, along a straigkgfnb:n:y8h9lo ln )n .kh.*e ht 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 nbeky:*n fh ln8)hknlo.:g. 9speed in terms of B?

  12.07: What is the net force ctq5do,fl, s/ 1g3 m9-evallx acting on the object during the time interval of the ax3lld , fqc t-os,5l 1v/emg9acceleration?

  12.08: Through what distance does the object move duriwa .d(65thpl( oaea xp7zd63t4exj0)kvy a *eng the time interval of thep ye (a3wjhvedl.70 dtk 64(xapxe) ot5aaz6* acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mas3/bk 1dfrhx;rtl*q(m s is changed from 6.00kg.m/sd/klh *;r1r (q3mbftx 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 J of kinetic; ,mnckrs-c392u n yho energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the followum2cc9 -on3yn kh s;,ring choices best represents the mass of the crate

  94.38: A force F at an angle θ abos :wgg6r )hgbem00sp+ve the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor rm0)se 60ggg+w: bp hsand the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and :v f lusl)d8.-.wmslidelivers a useful power output of:vm 8u wfsl.)d-l.sil 0.10 w 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 from rest near the surface o ;eq6jvw-n .lx sq1af9f 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 grounen9va;qs w 1lq6.jfx- d, 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 object during the fall?

  96.18: A rubber ball is hemfqk3e) (3wwv ld 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 energy E of the ball and its q3 v fm(w3k)ewheight h above the surface?

  07.06: A 500-kg car is mf r,p4b+d 5 hlarc2ar4bf. d1qoving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitud4+b ahbf,f5c.12r4a rqdldpre of the minimum average net force necessary to stop?

  00.26: A 500-gram ball mov-v tfe -:t7 3uqx1r,llnijt;u ing at 15 m/s slows down uniformly until it stops. If the ball tralt7qi jv1 3 n,tutr--:fu exl;vels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of diw4dl,cg 1sq xg8 b1gq+fferent masses but identical kinetic energies and the three following statements. Which of the above statements would bq1g 1w lq,cs8x4gbd +ge 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 b/-/oy39f l*ymwl erethe air with an initial speed of 4.60 m/s. Igno*o yrm9bw-ell/e 3 /yfring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps frotqb b(mhr:)k7 5u,bm rm rest straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed vqh7b:m5rbmt,b( r)u k and his center of 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 dr 6k:m5u iq upr1)ym/ p6wglbe4opped from aheightH above the ground. The object crashes into some soft earth and com umm/ u:b165g)ypqep4i l6rkwes 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 aheight6jqwu 4o:lm6 sr9 mz:t 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 9 :q j4zmwlr:ms tu6o6average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways untiyqjyuawkqt5 +5g c.t/*(0zi25 qzhp gl the cord makes anpgz w ugih2qjc5qtzty.0 5ya5* q/+ (k 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, e wmoo().m5dr:rqkb 9which started at the bottom of the incline m9b:qo)w.e mok rm5d(roving 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 asvx x:y q4 ;y.w3 xiar7szd6q: 10-meter ramp to a loading dock, which is 1.5 meters above the sixq:7w vsy.x;ry sx6a4:3qd izdewalk. 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 app2nh5 h;dtde)n pg )bn4lied 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 done by the force F on4 b5n) )hdnpe;g2 tdhnthe box for the motion?

  04.48: Two identical bowling balls A and B are each dri :32kzkoem1s opped from rest from the top of a taoi k2m :s31kezll 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 straight upwardurs n48xl81 er8rsu)o with an initial non-zero l xu1s r4)8 8rn8suerospeed 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? Ignore air resistance.

  96.20: A force of 10 N stretches a spring t3fvi65hto)4p yyzt hun 9t/n 9hat has a spring constant of 20 N/m. The potential energy storp43 tf /znhuvyyn69h)ti9o5t ed in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is thexe x*4vo9y l()u,hjtq maximum spevyuhx9 4t)lj* ,e( qoxed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M sjgje8g i6(7ry;e-oyh tarts from rest at the bottom of a fixed incline of height H. A person decides to push the object up 8jy(g e6-he ji y;7ogrthe 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.