97.01: A force F directed at an angle of θ above the horizontafb3f5 y jl,y-hl is used to pull a crate a distance D across a level fy ybjf-f35,hlloor. The work done by the force F is

  97.33: A softball player catches a ball of m lb848gvhr8h fb02q xlass 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 horizontal force exerted 08 8r8lhg xqb4v2bflh on the ball by her hand is

  99.14: A constructio;sy:5/2kt;lnk y,zbs m dld4i lb16ipn laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much poyslb lks /kd by2 l6;5npzdii1:mt4;,wer was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a )gg(i jeulg-n* y6mo 0horizontal surface for gug )e 0ol-*6m(ygnij5.00 s. The block’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 njm:f- d *ig6iyey:l : uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J *myygei:6 :j -:dif nlto 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 exerted on a 3.0c3s(rff)+ 1 ztm *w,mf cd,agq kg block for 5.0 s. The block was initially at rest fc*d),fct(r ,3 g1zsqfmmw a+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 directe/sc.;lpg0dg abl9 +yrv 15rj id to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at re9g+a l.50ij/sp ;gyldbc r1r vst 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 pxc(m/ix1 nyy :3ofo2oond throws a 1 kg hammer in one ( 3nm/i 2xo1yy:oxfc odirection. 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+vk af:+sti -z. An hour after the fan has been turned offsv+i+ft- :kza ,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 ,xlmf-4fd 8mcs kn ju,o8w:jtb );,jdkg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerati ; -wtfmmulj,fxj4od ,:b8c)jds kn,8on 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 bookroom 1.3 m *9i1tojl/v; hm.gu9fck dv 8ffrom the floor. If the janitor relocaov98v.t j;ih 1*mfld k gufc9/tes 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 mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of pp;l*bd1hv10z , kw nkoower to a car's driving wheels. If thdk01h ,k;o w* nvpbl1ze 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 right, ah+l1utbg/mkzf 2*5gv box moves with speed 5.00 m/s at the bottom of a rough, fixed inclingglu* /+21khmvt 5zf bed 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 t5i1- q, z3uu; hfshcd4,bwndxke.ty7 he 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 uz,bd f; ,y q.n w-h53scx74ikdhu1et= 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 s:* in6 k te7 dfzb4z4uccw o,ny9z*q+vtraight 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 F4cwf:nv4zc*o eqb yz n+,z69d tk*u7i, what is its speed in terms of B?

  12.07: What is the yqx7 ;bdzeja 3sud7 85net force acting on the object during the time interval of the acceler;j53s8bz7xq7d eduyaation?

  12.08: Through what distance does the objec izrpis5 -4c/c7 (y9 vpcrn;ewt move during the time interval of the accel4rc ciy9-v;(cs7p5/iwpne r zeration

  12.19: The magnitude of the e+ijyj:l c9+e linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 1j+ie :cye9 l+j4.0kg.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 energy while its s(g4zsr k y8s+mpeed is increased from 2.00m/s to 4.00m/s. Wysmz+rs (84 kghich one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above f - y3gm/hg:krc1 cbp bx1cy:6the horizontal is used to pull a heavy suitcase of weight xbygkm p- cyr:c/g6f11c3 :hb mga distance d along 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 and delivers a useful powe-+vi z/gpzb :mr output of 0.10 w to raise a block vertically at a constant spee- bz/gv m+zi:pd. 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 surv2ipslb8*v);bxrjr5bb j.uq-f0 -d t face 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,*j-xp if ru rbdv 5s0 -2b)ljvqtb.;b8 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 anb( tbat3sj4/td released. Assuming that the collision with the floor is elastic, which one of the followintt(bat/bjs3 4g 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 atvr0s.re6cw; hq31 uzh /vw pw+ 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitudeqws. hv 6w0rrhuw3z+ c/;p e1v of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down 4x /) saxf1mqpuniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming s 1/4)fx axmqpto a stop?

  02.26: Consider two laboratory ca jqr/4lb;r hn 75ugbv)rts of different masses but identical kinetic energies and the three following statements. W 7;4vrbg j5qnr b)hlu/hich 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 wit;uf (kj/ldaw+qj 44c ph an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reachel;wa4kdjuf 4p j(+q c/s its highest point?

  06.20: A boy jumps from rest;hp*ssnz,a-;t(nkvb ml x1)e straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center ofx,n h pat;vzb(ms;*e l) s-1kn 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 dropped from aheightH abo02jsknsm r,s; ve 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 exenk;mr2,s0 j ssrted by the ground on the object while coming to rest?

  12.48: An object of mass M fm03qd5 3z- vlujjdz(gwtu62 is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upwzf6vz3jdgq l-0wt(j m uu2d5 3ard 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 leng jzw6ge,x0mwe/7f*:ht.zxjn iv2y ) gth L is pulled sideways until the cord mae,6 j7:zyg 0v iw*x n gwjf)m2zh.t/exkes 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 s :j7ol19eam.wi1 ri sqled, 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 tq1 m9s: o7wlr.a1jieihe hill. What is the sled's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman mon eh :yyl3d)wd7i4 nd)ves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalkddi)7l4dhe)n ny y3w:. 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 1o g5dqtg v)12/kgcijthe 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 done by the force F kcjq2o5d/i1vtg g1)gonthe box for the motion?

  04.48: Two identical bo-mtuhd1 a1 l( )f3bfjkwling balls A and 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 grojbm1hf ukt1ad()fl -3 und, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass y 4bt0gh* lsiwqmf50ey 7u/h+M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws an0 yygw h45h ubm70 *qfle+st/i 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 stretc gas7j,uf: su j*ta0m+hes a spring that has a spring constant of 20 N/m. The po7ja g s j+u0s:t*af,mutential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Wha 0)ix*p/jo7q wjiu 4qgt is the maximum speq/j*pjxiu )4w0q 7goi ed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts frz1f/,a o9aahdm o)j*n om 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 pez1o )aao*/nm ahfjd,9rson 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.