97.01: A force F directed a )tpneqicovzvz o4do,37.b5trd 7y. 8t an angle of θ above the horizontal is used to pull a crate qp . 7 ovyno3vt57die4).dz,z8cbr to a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which /arvdm/1wpcs0p( 0 mn is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, th1cd//0p0(mwar msvn p e horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3uatwyc:t gii/f-, ehw/ nk:-/7 tsd4g meter above the floor for 4 seconds. During tt7d/g k/fe,gh/ itw wny:4-usc ta- :ihese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides wlka( b1pkqnl m *43 sq)-fc)jurm07kaith 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 injm(a3f4m7rpc k ln*bk 0qas qlk) 1-u) 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 hof:t2qeqkt2 9uh.mt5*h wf gf1rizontal surface ft qtwfmh euqth.21:2*f fk95g or 5.00 s. The block’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 t) zzp8myzasr7; :-amqhe right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slidmap)q m:zazz7-8r ; yses 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 right is ex.m+ lx:ezn 7q/2+wanmkxz hr.erted on a 3.0 kg block for 5.0 s. The block was initially at rw.xk2/+ena+:lxqh zm r7. z nmest 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 pondacdeyh9l.byp ,uc6 tc:e 2(97 fj-vmc 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 ta6bh ,ccdel2p(9fct:m .j-uvye c7 9yhe following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour afterrn5dao.ig2iqa :6 *xp the fan has b*axin5qda g.2:p6 orieen 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 speeo*9 nuhn+39vm 7pf kv(lw uge)d of 4.0 m/s, and an acce993w* kn)(7emlunpu v+ovh g fleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is onj/ q vm+y q( uh16*laamdaek7c/cnzxl.cs( 3- the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the .zv*6lmdkq+lc3m e(yn -js/( / 1ax7hcqcu aa 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 (ab z4pdxh./ a6wqd9l-a nout 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 a4qlxdn 9zp6.a-h /dw the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the bottozh xb:629a 8c,phi rimr,,lzmm of a rough, fixed inclbirr,,x m z a, m2z9:ch6hl8ipined 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 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 botto 0uz3gdmq yzb/i 6ts((m 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 = 2 si q/d0zzyg6bu3m((t40N. 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 ra ey-c2v2l ;zm6.oq+kr 68 t+ghwalmuight, each starting from rest, along a straight road. CarA has twice the accele8 alm2 6t-aqe;lzuy 2h gk+om+6 rwv.cration 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 terms of B?

  12.07: What is the net f+;b f/ bp/lu8jp16pk jwr8x5 ,jzishforce acting on the object during the time interval of t pf;f6jk, p/jl/rxis88h zu1+bb 5wjphe acceleration?

  12.08: Through what distance does the objb. *eya)4lajv ect move during the time interval of the acceleration*bya4) eajl.v

  12.19: The magnitude of the linear momentum ))vo bul.r: /n2ebbev of a 4.00 kg point mass 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 timeb2rube:e)vnb. /l o) v interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is incra,tw. iwu smf+n*/9 iszqv ;t*eased from 2.00m/s to 4.00m/s. Which one of the following choices best represen a9,q;*tw /iiwsmn s.*+vu fztts the mass of the crate

  94.38: A force F at an angle θ above yqx::0 igu()1yy ag lcthe horizontal is used to pull a heavy suitcase of weight mga distance d aly(1cyu:gay :li )0qgxong 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 anzax) q81 km,*x s,+gdl ldx;utd delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane8)qas gt;dmdxxz + ,,*xll1 uk raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, the 7b4ykna96af c gravitfc6kn97 4baa yational 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 object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor and rele tn eul :seiz2x68l-b:ased. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the:xitzee s6l2 l:un-8 b 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 see 53 ozp.oku ismacc 5m7w8n u65/lj1d9t.war es a barrier ahead. If the car takes 95 meters to kpa5ia15w lo7j/ocr9tw.s e.3n 6 dzmc u8u5mcome 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 uniformly until it stops. ii uk-v2az8et.g; )0;crcp xuIf the ball travels 15 meters, what was the average net force applied while it k)2.ucc; -v izipx;tr 8u0ea gwas coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic c ++jtiaaq+2uud y/+r//-yfqrnfds6 energies and the three following statements. W+-uu+/ 6r/ aac jd /qrqnffiyy +t+sd2hich 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 the air with an initial s )rmu0z7b(seiv9yf , cpeed of 4.60 m/s. Ignoring air resistance, what is the change in its pote 0ei 7cm sz)(rufby9v,ntial energy when it reaches its highest point?

  06.20: A boy jumps from re4ncw e / wcfewmvy-3;6st 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 -fv3m/enwwce w6 yc 4;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 ground. Theuu (ml/h 633pwqiq 8pe 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 upu 6lpm3ie/qh(3 qw8 by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above ) 6a4zk*jlypanujbek4i;q// the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maxijq/za;akl/i*4 pb4 n ue6y)jk mum 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 ibhb3 z .4x43ytw;7g(.bs6be ek lm tsmass mon a cord length L is pulled sideways until the cord makes an a yh3bms t xw(b.ltgzs4k64e3e7i.b;b ngle
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 uqx b;vv(9x+s7d lu.n yniform incline of 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 itsxb+q ( vxsn.u7y;v9ld original position at the bottom of the hill?

  06.09: A deliveryman moves 1x.-/rmo:dmqgq7 7h qw0 cartons from the sidewalk, along 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 mqr:owd-x /q.7hm gq7 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 aprqns i w 8,ae,nmm73kr7jjpf y;e*b15plied 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 onthe box for th, jn*,j 7mpm7swek3 qbnr51i aef 8yr;e motion?

  04.48: Two identical bowling balls A and B are each dropped v po, 2;;1ezykjb1k tdfrom 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 pk1 t2bv,y;;e1kjdzo 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 upward with an initiah86 +wr uz6jtu 5mbq)sl non-zero speed v. The ohu6tqju m6+wr s58 bz)bject 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 that has a spring constant oz8 ru k7m)59o+dz4 2d fiiuvzdf 20 N/m. The potential enerz7rzi dzd92f)i4u kv 8 +odu5mgy stored in the spring is:

  97.10: A compressed springd4ldcjh-8 f:m) oj(w c has 16 J of potential energy. What is the maximum speedl df4c)j m c(hj-wd:o8 it can impart to a 2.0-kg object ?

  

  10.31: An object of t 7 1d(0amki,wx ))qughnc.pemass M starts 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 a.egpwq ux,a1 t7mdn(i) c0hk )pplied 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.