97.01: A force F direrk0+qvbe)t*dx; .p5 8yun3mxj bcoh8 cted at an angle of θ above the horizontal is used to pull a crate a distanxebq3 konp htx5mru) dy*c vb 8+;j0.8ce 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 is k1-w)bbq/nu9 ynjla6 moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming b/l1wau9y)k6-j n n bqconstant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wal0ta .zi;p1be,w /qoiyevsq/ 0s-s-pnlboard 3 meter above the floor for 4 seconds. During these 4 sz0bp.ey;,/ w0i a n1 iev/sq o-sqtsp-econdshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform ay z s0q+ibl cf-8ufr78cceleration on a horizontal surface for 5.00 s. The block’s kinetic en yb7usiqcrz+l8f 80f-ergy 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 uniform acceleration ozoqdn +n6b((ju rof/pv7/yt, n a horizontal surface for 5.00 s. The block’s kinetic energy str o(d/ vrzn6/q +u7bofjnt(p,yictly 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 is exerted on 59te +tp3p b gw-p+qxl.u+on na 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface.np++n tlwutx9pe -o+ b 5g.q3p
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 exerte2cln7+2u/ uqguke) ug3pmu 7 nd on a 3.0 kg block for 5.0 s. The block wapu2k+ e/ 7mu2 ungu)37 lcqguns 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 thc5 dap* 5wem cv6tp756js5k y6n2m jafrows a 1 kg hammer in os5te6mj6j 7c 2p5*aw56nykmfdcvap5ne 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. An hour afteru.qh v8ije(6x 4dz. dk the fan has been turned off, qzd(ek 4xu6dv8h.j . i
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of pi pt-g4zs (6kmass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and apgk4 z -spi(t6n 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 middle shelqn or;d1w7h d;f 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. T71 ;q;dd nrwhohe box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) ofppq1ne6cee60ok* i /3 ez:d sf power tofpe i kd6 ze3o01e*:/epq6 ncs 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 rig5gct p,i1y,vcb9 w m.1lx+;dy 6mu6 jxximhv6ht, 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 ofF6.69m,myixu1vxp v5xdj;i +w hmcygc6 l1b, t = 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 *bzp u. f*ug,c5.00 m/s at the bottom of a rough,fp, ugz *b.cu* 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/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 strai t i3lj *,7gdbt0si8*zmpdg9cght road. CarA has twice the acceleration of Car B. Aftem 0dli8j9 ,bt tzid*7*gcp3 gsr 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 force -:7 neroitz)9r- uqo iacting on the object during the time interval of th7 or9--e uorq :iiztn)e acceleration?

  12.08: Through what distance does the object move during the t9+ pwweqs+ 4nu /2-s 0ohyqrouime interval of the aco nshw 0w+9y2us op +/uq-eq4rceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chan/x0x5 zg0leux ged 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 time x0xxeg 0 lu/5zinterval?

  14.11: A crate gains 36.0 J of v v ;8au;8w8x*dmwzjdkinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best repzdaxw v;v8u8 m8;w *jdresents the mass of the crate

  94.38: A force F at an ang i*zzc2g:vtghg-z/zs )o)s2 8q5ad vzle θ above 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 and tzozhqz2 avzt*/g:8)c )isds5- vg2 gzhe suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and y2oez9p f6-hju 3k. oddelivers a useful power output of 0.10 w to raise a block verticalh.dpej6u2 3o-fyzok 9ly 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 of the Eartp54n,+hgi imr8x xau iv94de8h, the gravitational force acting on the 1.00 kg object hr 8xix9u54id gv,pn+48meiaby 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 and0tc m8 i5ikss6qveq; zzq558x released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relatioscez80xt6qz5sqv5;ii8 q 5 mknship between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is mvypqw 28ivryn.fi f.s l :)a5+oving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meter5 :+pyrv8 f fiqw.i)s2n.yl avs 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 unif honm2j5 genr/, ,8m9eicmw, 5abg+yyormly until it stops. If the ball travels 15 meters, what was the average net fon,h+yagn255c me,/owerymi 89bjm , grce applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but t/qzgj0wt cx* mb,g9;identical kinetic energies and the three following 90tgt gzbxj,; mwcq*/statements. Which 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 z bt7zfylgv n3/pfpda*h2 4h /g1b/a1 of clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highe/3f1/zdn lza g/ftv p*2ha7b y gb4h1pst point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete y4le,bkcd8cllh4; rj y/l7*ksurface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass ris lye* ;,7l8cr4d jkcblk4/hl yes 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 dropgfi*:2: qvzla ped 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 exerted by the grov:: l*azf2 gqiund on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight Hnu9p-4 bzuxj. 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 average net force acting on the mass during the uu. p-nx 94jzbcollision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sida8s l.n(m i/d 7;:uvbxby* c0f+ yylcoeways until the cord mv:yu x ds7y0myi a8*nf.(+obl cblc/;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 +jwx2v l-(mni j8;k-blr+dspbi qt8* incline of unknown angle. The sled, which started at the bottom of the incline moving at 10-ibk v+* + nxl8(r b-d;jwmtsqpjli28.0 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 car13m -yjjobk+ j, byf:vdf):ca tons 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 tot: ):-y,dkmvffyjj1cajo 3b+ b al work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (aq v3czvg (huo40 74yp g-d,nn ac0ea*ks shown in the figure) is applied for the 6.0 meter motion of the box upward alanpvd(04 3egc ,a-4uycv g*noh7zqk0ong 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 *qkt:eqycmq5 :mv+8l 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 ground, how are the mechanical enq: cl 5qt8ye*:v qk+mmergies of the two balls changing?

  11.28: A person throws an object of mass M straight47rw whb 2tdfve:)w8e.hwljj.t 8sj: 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 withr.jhjewh24tldfb .ej7w)v 8:8w tsw: 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 of 20 N:nj+b ms 6(pesen4h0epk hk0* /m. The potential energy j0pbes4h6hn :ep ( k msn+ke*0stored in the spring is:

  97.10: A compressed spring has 16 J of potential xkd6gq smp5yr48ry 53 energy. What is the maximum speed it can impart to a 2.0-kg o r585xds64y rymqp3 gkbject ?

  

  10.31: An object of mass M starts from rest at the bottq/vrcw 6tv15yom 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 incwc5v/q6tvr1y line and the object for both trials.