97.01: A force F directed at an angle of θ above the ho: 5pd vd t9a(gtjii5feq7) wj/rizontal is used to pull a crate a distance D across a level floor. The 5e w)ij9 d(7pa dq/g:jiv t5ftwork done by the force F is

  97.33: A softball player catches a ball of 01i0xff s 5gcp8zkc s5;w(kbq55nnnm mass m, which is moving toward her with horizontal speed v. While bringing t0nc0 5x5 nfn fcwp(sb5qi;mks1kg5z8he ball to rest, her hand 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 shen/+st v )7docqet of wallboard 3 meter above the floor for 4 seconds. Du )dtc/q +s7vonring these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides wii-d bndbmnp :gsj5z i8n(9o33th 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 in this tim3mbsi8 o9 z: nbd3 ngni5(jpd-e.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceler8hif.i 0k b(cs*gtr*;ay 1ejd0jt3g b7x3t mxation on a horizontal surface for 5.00 s. The block’s kincd feshj1tx 0;t8.tg0ik7x(* i3a m j3rb gyb*etic 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 diagyl(qacv ,ax6 +qz/ pdlc8)rb .w.e /(muau *rected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initiall.qrx(u/.d )y/*ab8 pqaza6vlue, m(wagl c c+y 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 right is exertedqee6bj f x()4 9mndu)x on a 3.0 kg block for 5.0 s. The bloc d 4b9)qj f)xe(m6uxnek 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 frictif7(:wc oo u7)mnxnzu6onless frozen pond throws a 1 kg hammer in one direction. z6f:uouo(cxw)n7n m 7After 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 kin(d2sd v(;l:fk7v aspwetic energy. An hour after the fan has been :s7fvl; pkwvda(2( sd 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 jlqlqwnc i;i q9; ):7c-m8xez, a speed of 4.0 m/i-q)njcw :qlm c; xei;7lq8z9s, 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 0ln tg,06ix/drs1x 9gcwig)h l,n i*x middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the9 1ilhg xird,0/ilxw 6t0n n,x scg*g) 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 32oy6-qt604d pp dahz z6 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 the magnitud646p0 tozh6pddza qy -e of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves oofk3tn -ny- ,p/ ai8p4na.gmwith 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 le -n83aof4,ty mp/ ki.-npoag nft 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,;;qthi+ s mwt6km-fz*yu:czl )et8 h 8 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 constan;s6-et8hztzh*uyc mqk:w l ;tfi m)8+t 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 rightidnw68svpm rj52 ihmzhg xny 7 1*9au16um4s8, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed 1x u d7jsih 5 m1zs2w6mrh9n6vpun*m8g4y8i aB. 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 time interval.+bj h 5 df7k4nrm;zkk of thkm5 +z47hk jb.dn; krfe acceleration?

  12.08: Through what distance does wu8 m v isqdhr23p7c4*s,aj:d the object move during the time interval of the as,:h23ci74ds j q pa* wdrmvu8cceleration

  12.19: The magnitude of ez, mp.s9e)dd wiz-m /the 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 of m 9wz.z de)p/sm-ie d,the mass during this time interval?

  14.11: A crate gains qc g+dw -7sd -5.okn;b5epyom/x9w kl36.0 J of kinetic energy while its speed is increased from 2.00m/s o 5bwql5k/-dm-cwok +n9x. yd g7s;epto 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle lg i3;ol;bow-r9c s-f;xj k 4id ghv-mn65b4bθ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant ofbvlb4i xi;;rm 4k9g-6 csbn-l;j 3-5hdwo gvelocity. 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 deliverd7n-k4 ub. *v finymenymql+ u:.ir,(s a useful power output of 0.10 w to raise a block vertically at a constant+m nui :*qnni.edr,vul-b4 .7 my(kyf speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object / tyxo.c ssj- l7 yf(vqylyj5r*( 9(qris released from rest near the surface of the Earth, the gravity7yjrjq9sfyo5. - *l(t qys( vc(rxl/ational 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 ref93puf3/ffv d a7,;lg-zy geij*fpf, y8w i2kleased. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the togy-gi;fl7a 98,udj f3,ff wy *f2 3vkf p/pzeital 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 sees a barrier ahe(zxg)c* njc 5nad. If the car takes 95 meters to come to rest, what is the magnitude of the minimu *c)x5cn zngj(m average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uoc0m qrg0c o0/niformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a sto0grc o0c/m0 oqp?

  02.26: Consider two laboratory carts of different masses but identical kinetic kfix zpn0m)m9 3z-u:denergies and the three foll zu-f xn 3m9m0izp)k:dowing 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 of clay is tossed vertimv jm7l45hxlj++ g1nbe(y6x z cally in the air with an initial speed of 4.60 m/s. Ignoring air res m1v4z j6h+y57lgmlj+xenbx(istance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward fromy4nyf,gav-3 dn3 mmt: 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 work did the average noyd4v g-an,yfm3: nt3 mrmal 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 a4xzhqcm cxoz(sv4w*x-,03(g2dzj o l bove the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Asso(zs v-hq (jd4x o,x4m c2zcg0*zw3 xluming 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 drop)w27 wxgne.c e09wylbped from aheight 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 average ne) e 9c.2eb0ywwlng7wx t force acting on the mass during the collision with the surface?

  96.38: A pendulum bob massiti8/c cq m,5a mon a cord length L is pulled sideways until the cord, aq/cm8tc 5ii makes 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 unknowvn*7 9e*j+ducj3g 4 aaux3ay 0rdl- syn angle. The sled, which started at the bottom of the*70n3a-jrcg 3x9ud seuayl *dj a+v 4y 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 its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons froms:c5 u):o 5x)fje;fndknb7st the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 metnk)es7sc bt:)of x nd5fuj ;:5ers above the sidewalk. 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 tpzmtls,v;6(vo f0 v: (as shown in the 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 ( vzo;mtpfl:0s6vt, vforce F onthe box for the motion?

  04.48: Two identical b8+ afwfdr 8c gxm7ek65an ,ta9jl6k1x owling 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 scek8aj8ldx5rf a wfag7x9 t ,k66 n+m1trikes 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 t i+(z hz ls4h8:1)+edum .g8fqiqv rhinitial non-zero speed v. Th zifer: +u8qhgh v(dlh .smtq z)4+18ie 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 that has a spring consta*l6o h2y el6ksnt of 20 N/m. Thes 6lh2* ekoly6 potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy d7*it) zvv7orlce(h ). What is the maximum speevev)t( lz hc 7io7d*)rd it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts *c zje- dg17rvfrom 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 person on the block compare for the two trials? Assume th*rej1gv- d7zc e same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.