97.01: A force F directed at an angle of θ above the horizontal is ubu)o0 3tlk8 kxxx8u;w sed to pull a crate a distance D across a level floor. The work done by the force 8 t30wb xukx kou;8lx)F is

  97.33: A softball player catches a ball ods*r:(s hf(twf mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hanwr( sfs:d(t *hd moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter abo6m z( ,gzf1,q iy2fqdd;c/qh d/y1cqd, qmdf26f ;dhiz(q g ,zve the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horxer.sq -9hfo0sl7ph i;jms:f b s1-o 1izontal surface for 5.0 r.s 9sob ojfs 7-f:h;psh ixq101-lem0 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 urx8gk 3tn5 *7par2dc uniform acceleration on a horizontal surface for 5.00 s. tp8kx3gnc5r 2a7* udrThe 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 f:8vved e5w/im orce directed to the right is exerted on a 3.0 kg block for 5. :m/vi8 evdwe50 s. The block was initially at rest 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 ;*mps/o- ayckuy5 6-tkxwo4w ght is exerted on a 3.0 kg block for 5.0 s. The block-4ua/c6*omoys 5wx-k w; t ypk was 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 throws ads gv)p 5xt7,r 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 corr5px)rt g7,s vdectly describes the above situation?

  03.14: A fan blows the air and gives it k8fn)khad+-lzu jos2c42, h g7b;h i zfinetic energy. An hour after the fan has been turned 2g4j+ zsz-)ibnf,ucf 8d l7 k;ahhoh2off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a 9g6ssr0mqc;e+;lzy zr ;hp0 owik*i+ position of 3.0 m, a speed of 4.0 m/ssilpr6qygwsikr;e 0;+*9 ; zo 0m z+ch, 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 textbooks is on the middwpjdv ,w *jmy)etc6t,ji;2 :ole 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 thy,dv; etjw2t j:,oc*i6wp )jme 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) ofv t hsq04-y9zz power to a car's driving wheels. If the car maintains a constant speed of 30 m/s 0h sz z9tv4q-y(about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a lhe2p7el i n)/n)ofp-:ub+3zg c f oo8box 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 op)ep8l lfi32n:guc -) f +b oznho/eo7fF = 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 bottodc8s+gr8:aoo j;zr y, 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 = 240N. The box, of may+8cg:oz 8rr;a, jso dss 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 startin :srz izq,3v*kzgg/46 yj 3pntg from rest, along a straight road. CarA has twice the acceleration of Car Bt6gk* ,/4 z:nzgyzj3pvsqi3 r. 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 force acting on the object during the t5k0r oh+ nbw,eime interval of the hkrn ,o50+wbe acceleration?

  12.08: Through what distance does the objec0 f f(e u/kni4ifqmj9 +kp;y5ct move during the time interval of the cu ky9f0imffp4qnj5(/ik + ;eacceleration

  12.19: The magnitude of th,d hq5e)rq3( -:m/wnzegr s; c rhef8ce linear momentum 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 eng;q-h fe 3qz: edrrr)(8c,swh5 cm/of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is + k.63: *pg:8obn ndg5 :oiw0skdo 4tvpkriqvincreased from 2.00m/s to 4.00m/s. Which one of the fki5:3gw i*: d+k60obn 8kdp4ot o.qsgrvvn:pollowing choices best represents the mass of the crate

  94.38: A force F at an angle θ a8f 7p fy(k;ik1bzb+hizd ,l2 cbove 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 the suitcase is μ. The work done by the frictional fl8;z kpi7+c21y,hdk( zifbbforce is:

  14.31: A toy crane exerts an upward fow* ly yi:l3 ftf,cv5a-kc9w yghbr *9)rce and delivers a useful power output of 0.10 w to raise a block vert9blykw5yct gvf )3c-9ar *i lw*,hyf:ically 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 releaseb*m: kb :.f. tmywug78j rcfr2d from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by m r 2f.rb7k8*mfbgw.cut jy:: 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 heldl d.llwltxc; dce3i 79bk7+3 g motionless a height ho above a hard floor and released. Assuming that t9cedc77blg+i3lxl ; l3td kw .he 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 height h above the surface?

  07.06: A 500-kg car is moving at 28 m/0:w/ j2wx qgw;w* ozmhs. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to so0mhwx;: qw* /gzww2j top?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stoq5sp 4zeo7op7ps. If the ball travels 15 meters, what was the average net force applied while isp7q o4 5eop7zt was coming to a stop?

  02.26: Consider two laboratory carts of different masses but ident o 6y s4;.,smhpp/h 7jqodlqss *2vg;aical kinetic energies and the three following stat6;,m4 s/lysdpja2gvo q o;hps* 7q.hsements. 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 of clay/u-wn 45u6s2kper frn bj;s-y is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is th4e ;-nby6j2wu -5srfus r/pkne change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward fr jjm/:5 pt r wx0qs+ yxba6z1n3-selg6om a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface wit/z6xqj eyl-p stg0sra 3:15j+xb mn 6wh speed v 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 dropped from ahen ip*e9fymc e:e3l 36cightH 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 resistmn3ecfel :6ic*9epy 3 ance 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 from8wlrr tht6f;jit 8 q,, aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting t;q rtwt688fjr l,,tih ime 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 is pulled sideways until the cog gyub/8yt5ag;. 2;dh5tbj/ y:d qzkxrd make5zxk2.g/gu;d hqa bt jd;g/b8:ytyy5s 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 unifo3)6knpn mifgt;d06+i q+yxx xrm 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 hillk3y06mx qifx p+;xin g dnt+)6. 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 sidewuk:tz -,+oxx8eh 0jnq alk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewa:ezh qjxx+t-o, un08klk. 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)*0cmf a1f,m4 dp t)ua3 btdf cfrr3f/, 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 3/ft ) dt3m0 mc,,faba1d4fcfrup rf *the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each droppb :a 1f9tuzv jqm+/hem/j09cs ed from rest from the top of a tall tower. vba 9zq+/m9e 0m/j1 : htsfcujBall 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 objectplu w uv:/tg85otew*w u4+x x0 zu8l;h of mass 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 an object of mass 0.5M stu zh g*8xpl0e:ouuv5w+t/lwt4 w8; xu raight 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 sprinc(z;be4oza/ct i6 .x0urj u0ug that has a spring constant of 20 N/m. The potent .0c xbrcaeiu;u0 uo6ztj/(4zial energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is th2d3; vkt3gk43vi ygmte maximum speedtvvk23; gimktd 33gy 4 it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottee3h) g f nf)lv.,k:cn ;u085koepbsrom 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,h5sckn 0;fbp))g:3.f8e neroevl ku 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.