97.01: A force F directed at r2x7v a1b9f hk3bweu7an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done bbk1f7 xau 7b3 ehvwr92y the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward 8uxj n8g;qtm9her with horizontt8qn9 ujx8g ;mal speed v. While bringing the 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 sheet of wallboard e iotj4+a x0c33 meter above the floor for 4 seconds. During these 4 secondshow mio +ce4a0xt j3uch power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform q jhjcxps7-:a2 gz6l4 acceleration on a horizontal surface for 5 shcj: l7qpz 6g4-2jax.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 wi an1lp p;mtxs6v;( j3cth 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 v1n6s(mclp; ptx;ja 3in 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 dir vxc0b+e8qo.; esj*w6sg)i zpected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initial+ze*)c6jsvq w.;80x bogis pely 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 d tnv ly1r- gw+e2u2y;birected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest abve-t+yyglr w;n1u22nd 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 rez mght26 e+zf3, nxy n2b:w3srston a frictionless frozen pond throws a 1 kg hammer in one direction. After the thzyz, et2hbn+ n 3xr s23g6wm:frow, 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 ioif 2 j1 lpwjb+m1bmva ,8/gw,t kinetic energy. An hour after the fanvg2lajf1mwj , /bmo1bipw8 ,+ has been 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 q9d* kuyv)0r a speed of 4.0 )*u ky0rvq9d am/s, 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 middle shelf in the bookrohr6z 8le bpk9)2im d)l b:2 t1wuboi(jom 1.3 m from the flooltumbdoi:9bl8zrekwh p)6b i1 j2)2 (r. 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. The box has a mass of 10.0 kg.

  02.32: An automobile engine del *7)scszhx :pwjt.w 0n9/mkptivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. I9:.7wpth)0sxtcnpjszm *w k /f 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 right, a box moves with speed 5.00 m/s at t64y6ye5dg qidz w 6am+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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.y56 qm4+6dzg6 ewaiyd50 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 w79nnxp4/x3dui5 u nklith 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 of F d5k9nn43 7nix /pxuul= 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 t te;,ct iq,a7che right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Caiq,c t,;ea7ctr 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 actingw ,+dc ojk.7ty on the object during the time interval of th,t .dkcw7oy+je acceleration?

  12.08: Through what distance does the object move during the time interie2wgv6wl::+gn li ;hval of the lww g:; leng: iihv62+acceleration

  12.19: The magnitude of the linear momentum ofc7s m6u+zht /7enlyi* 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 tm7 eyzs+ul*/it67c nh he 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 speed i ocuhe74 m8l-hs increased from 2.00m/s to 4.00m/s. Which one of the following choices best repreoh4m u8 hc7el-sents the mass of the crate

  94.38: A force F at an angle θ above the ho 7 iky)juem,fwn28 k05pve.lrrizontal 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 bvy imrk.ulekj5w8 027 p)nfe, y the frictional force is:

  14.31: A toy crane exerts an upward force and delifne ,ile(7/alsr66 d cvers a useful power output of 0.10 w to raise a block vertically at a e7 f d/el rlc6a6s(,inconstant 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 sm8ir (bkcrv mi11-d8 lurface of the Earth, the gravitational forcerc8m db li (r11-8kimv 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 h ne2 3kt0m,zoreld motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following grat302,om krnzephs 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/s. The driver sees a barrier3v/1 m/p .1euvernj rts/;m zy ahead. If the car takes 95 meters to come to rest, what is the magnitude of thenmuvm y// /1p3r vejer;tzs.1 minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformpkw9wf (72ogcz47gl k:m ig4tly until it stops. If the ball travels 15 meters, what was w9( tpg74kz7kg2lgw m i4: ofcthe average net force applied while it was coming to a stop?

  02.26: Consider two laboratory car67zerp:b3 ,zj wg-h :gd8axbmts of different masses but identical kinetic energies and the three following sta zg:x ,d zp6bw7-hr3mgb: aej8tements. 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 vertically in the air with an in o0665oct t0v76ivhjcv 0gsm pitial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potenti 5 jh i6cpcgo6svt7vv0m00t6o al energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete sur:,bxtz t* m (he5uf do5krqn. o50rh4rface. The boy, of me5ou5dz,r.hxt:n40 b (*rrq fomt h5kass 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 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. The object5pfpg bx.j+:pdc :og+ crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that gcjo +bp:gpf+: x5. pdair 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 dropped from aheight H above the ground. The ob6sfb1wx gz 2mm ,q40zwject bounces off of a horizontal surface in a collis0b4m zw1gs,w qf6z xm2ion 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 collision with the surface?

  96.38: A pendulum bob mass mon a cord lengzp9*wu43s :(zjf f/5qu3(t uvgdkhrsth L is pulled sideways until the cord makes an angl uv fkh/gw f*jz(duq 5 3z4u(9rts:3pse
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 .g gzuj70x/ 6em fmbi1up a uniform 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 t.e0f7 /mbzgi6m1jgu xhen 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 from the sidewalk,*xx8yq8+yn3 w4gsusc(u o u r; along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalkxn 3cu; q +go(r48 uw*u8xyyss. 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/lukzie s11:t7/9dcj iunjm5i a6l+u 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 mi79uil d1cluuk/1ja: 6j/s it5ze +nthe following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from nn6 coon g6-i-the top of a tall tower. Ball A is dropped onnn6o--o c6gine 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 5rahh zjd3 z4 v( 9ickq*mh)g+object 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 ma)zj39cr h4*hka i+mqz5v (dhgss 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 stretchesne6j5mpk- c a,2w (2+gaiywp v a spring that has a spring constant of 20 N/m. The potential energy stored in tekwwivj, yg(5 -pnpm a+6ac22he spring is:

  97.10: A compressed spring has 16 J of potential energy. What:0h45m1h zf02t ltxnfx4oawzs uzz06 is the maximum speed iuhn:xsa0o45zmz xh 0zt1f l42tzf 60wt can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom opv 5 9lql /a(x+bvc /6dgri,msf 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 thm+v , / scbva /dlg5p9rq6x(ile same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.