97.01: A force F directed at an angle of θ above the horizontalx) vw0 :y1)cs8wkv) 7 dtopyzixud+9r is used to pull a crate a distance D across a level floor. The work done by the force F is )dc:kv ui07x) vs +dr otwxp)w198yyz

  97.33: A softball player catches a ,6rx tn5w z-f6u 8sw(c5qb delball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves bacrd56s ceu, x( -fn5zbwtw6 l8qk 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 wa1)ffj i+9mjyc8hc e3bllboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallb be)m9fjc+fh8 ci1j3y oard?

  17.11: A 5.00 kg block d) o68.ddwpbj slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kidobwdp.j8 )d 6netic 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 blocpqn,a6n g th(3k slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreaa,( 3nptn6 hqgses 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 a 3.s5ij 8yre, dj4ks2qpph-7c eyws+6k(0 kg block for 5.0 s. The block was initial rec eyk+y ss5 iw(6h7ksjp8,qdj24 p-ly 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 exerted on a 3.0 kg bf;)xu*p)lu rv1(yj bw lock for 5.0 s. The block was initially at rest anu(y ;xuprw*j l1 fb))vd 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 re +in sgk 8 qqcnj1u6u;49.6jhf dyu.hcston a frictionless frozen pond throws a 1 kg hammer fydhj1ucc4.sji;n 8gu nq69h u .k6+qin 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 correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. Anchv :e9ms3t7cos6 jz1 hour after the fan has been t:c7ce sj1m 9szot 36vhurned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of maszhsn gb3v(d+5fh )(u z9 yi6uudr-u9h4 bmrr/ s 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acc)di6rnbsz/z+ d 9-9 4f(u rmruu5yb(hhg h3uveleration 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 middles elwq;cjt-v;q79jb :81yf ek 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 the floor, how mtefb: e y9-7l1cwjsv8jq k;; quch work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile env,cr*i z05m yagine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car mainta ca, yi*v5zmr0ins 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 5.0a;gb+hqi)a63jj)r* l en9a wgq.be r40 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of theqa3* jjw 9i rn)l)a +bag hb;6eq.ger4 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 wmif /lkbi+ ;o +bof;zd3b09e 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 + iw of0+kb;z;bliefdo/b9m3force 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 straight rh6j 3bzb z+ml0oad. CarA has tw0z6+3bhj blz mice the acceleration of Car B. 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 dur jl3gd8nc+v. hing the time interval of the accelera3+l8hgn. cdvjtion?

  12.08: Through what distance does the object move during th0i f0e38 +/b2z xqvwzvc0deen e time interval of the 3cv/2q x0b0+iz we en ezvd0f8acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mahuqmnftk+;c,pm. xf.kw--9mmz9 3nh (cv 0 ntss is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval ofm , u w.+nxmkq3 ;tn- 9zhcnkf-p9c. hv(mtmf0 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 kinetqukbf khykd ;94e0k c1tvk. ,3u8afjgp 4 ,2gbic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of gu hb v,8,yf4bkk;c g j k.421fdkk pq3uaet09the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavy sl2va*x nbh 6c5uitcase of weight mga distance d along a level floor at constant velocity. The c*anh 5cb2x v6loefficient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts a-;g5jehoh-ucq(nue:/h sp q* -ll )cl :t1 onen upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At pth1-l-hqoou-uenc ;g j*: cle)el q5n:sh/ ( what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released fromvmu u,41zgz.jm bu()s rest near the surface 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, whichu4z(g)1m zsjmuv b ,.u 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 andfrul* r(p fon,q .q.+w released. Assuming that the collision with the floor is elrlpqqf+u(*r .n wof ,.astic, 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/s. The driver sees a barrier ahead. If theal2jag o-0-4bmjgo *u car takomj-g2uob ja*g-l04 aes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram bala3p 2) aod astb3s7i7ll moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force appli7a7 po2s)al3s3dbita ed while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses buvsb h 8uc12g0tt identical kinetic energies and the three following ss 0vgc2 h1tbu8tatements. 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 2o;e9ygq zh7t1e1fwgitial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its hieteg;f woyg9h 2q 71z1ghest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concreteu6f(bw8hy24 urdv-y p surface.-b2upw4u8 yyrh( fdv 6 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 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 aheigyc:0 u8qn :ff- jph2jbhtH 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 ground on the object while coming tof2j : pcbjy80:nqf u-h rest?

  12.48: An object of mass M is dropped from aheim1o ) ftayw/v3ght 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 net force acting on the mass during the col)vt afwm13oy /lision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sidewaysdfayjkxa. 8)- 5j rwzc mzn-7; until the cord maz 8-n;.fj - ra5ym a)z7wjkdxckes 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 ofu5 ky e 7ube/,y n9/nr7 jod1/dnxwv(l 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 hill. What is the sled's speed when it ret5r7 ue ne7y n(1jlv /x,o9bydku/dn/wurns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalci *3n7)givj zk, 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 total work done by the di v7*n z)3jcigeliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=zy;y n jwi3n2sruu(:-50N (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 forcuy2i-z u (3ryw ;nnj:se F onthe box for the motion?

  04.48: Two identical bowling balls A and B are0ytr0 c6xm 9jx odms) pm.iwx,rd(*q4 each dropped from rest from the top of a tall tower. Ball A im0jxp4m iq)xr.*90wsy tdrmcd 6(x o, s 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-dae*0-jfosussq4 q y+6 y;byhs :8xs an object of mass M straight upward with an initial non-zerqsq8ysd4y6os+ sju f;y- sx:a0 eb*h-o 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 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 cof :tke6 csohv1-qlu 1+92ab denstant of 20 N/m. Thdqefvea 12:-9b 1 k6so c+lhute potential energy stored in the spring is:

  97.10: A compressed spring q)i; ,lj ,cq68leovaihas 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg object8 q i, 6i)al;jvoq,cle ?

  

  10.31: An object of mass M starts from rest bfnt* axb-/ f;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 f;*afn bb/xt -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.