97.01: A force F directed/1st;u72*1 ovj tr-k3fostgnqbl.c k at an angle of θ above the horizontal is used to pull a crate a distance D across a level flooroc* 1 k7k /1got qnlbsu-t .;32tsrjvf. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward 6bm kh*q4 n(li ue2ym8her with horizontal speed v. While bringing the ball to rest, her hand moves mhl un8kie64m2 qy *(bback a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kiloaya 5la+/zvf a3ae)y ba+a :b1gram sheet of wallboard 3 meter abova1 abya+ya)e :a +v3afz5/lbae 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 0b fam)t)x0 cq uniform acceleration on a horizontal surface for 5.00 s. The block’s kineti0mt)cb0xqfa )c 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 bx-;f6, urayb1h:os oz lock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kiy:,h os;o-f xbu zar16netic 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 directed to the right is exerted k. 5q(e6udzr0 rgf ,n(wswaiz62i n8 mon a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a ho,0knn sfr5.zii 6emw2(uz(w q8 ag6drrizontal 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 toa 0otp,f0i 8to the right is exerted on a 3.0 kg block for 5.0 ta08 fopo,0 its. The block 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 frov1hx9taf 1 re6s.2kqw b; *rqgzen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in r;a.ewq *6g1 bskrtf92hv x1qone 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 any.bb.b)th qhwsq:1 j/r a )yb3d gives it kinetic energy. An hour after the fan has been turn.qtyws:3hb bj/b a).q 1yh rb)ed 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: 7jmv(2eyit/zl7zv qv4zhu+z-1kg y.0 m, a speed of 4.0 m/s, and an i4zht1 qeuzvgj l(:2yv/-zv77ym+zk acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old texzs r /.5vx ,xj;*vecv (f(evrzy/.m8.tcgclu tbooks is on the middle 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 much work does he do on the box. The (lr c.zuezx.v.( 5 cs//ev t xmvjr*,8fvcgy;box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsu ;x7ts6)dt2dqzd7sr epower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), whqzt tduds) d7;r2s67 xat 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 x 8iezz s l8lx6e w-1z 9fxi9ml,p+4num/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 + xi-8e8z1x9lzex i 9,l w6npusml4zfleft 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 figureiy+v 64kvhlg +cp;q .e5yx/r k to the right, 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of leky5c .+vkh 6g;i4r/yx +vqp2.50 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 thuh e4*ce 5/zzke right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After teku5*zh 4ce/zraveling 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 *0z kuj.*ckluru2aix5 c 3fh3s cs52znet force acting on the object during the time interval of tkkzu5l f.32zc50 s*auricx2 * cj3hushe acceleration?

  12.08: Through what distance does the object move during the time 6 jg7sad94zkwlg 6ey, interval of th,zj 9lw dga6kg4sy6e7 e acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point o ,c3p + n24fdkoz-vexmass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. Whvxd4 c +ep-n2oozf,k3at is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic enoadwp/m 7*kg0 ergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the cr o07pdka/wgm *ate

  94.38: A force F at an angle θ above /8o )p .bzx (9g)ya wtdww0ybgthe horizontal is used to pull a heavy suitcase of weight mga distance d aldot(/ gxgw)waz yw 90yb )p.b8ong a level floor at constant velocity. 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 delivers a usefub, ofx +,w8cvkl power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this craof, bv8 +xk,cwne raise a 0.20 kg block?

  12.18: A 1.00 kg object is releas r1qw r1h(exs7id f/q.ed from 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, which one of the following choices be( f. hxqisrd7 ew/q11rst 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:y1-q.r3.j6v nq nf/gwb uqzh height ho above a hard floor and released. Assuming that the colli.nu:qhgz6/ qnqbrf3j v- y.1 wsion 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 mov phab.nc: xbmi53z1;(yoo +ep/dt *eaing at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average n p byotce+5 a; e3(xon/mbz. :h*1ipadet force necessary to stop?

  00.26: A 500-gram ball moving at 15 y;8 x hl;r6rck:iu lj)g *ws+gxbj+x 0m/s slows down uniformly until it stops. If the bgc*8yx+ ;xkgw6)xbl i+ulj:r sh0j; rall travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laborato uyw;(r q5fyt-e;rpc)ry carts of different masses but identical kinetic energies and the three following statements. Which of the above st-e;)u;y wqf(rp rt5ycatements 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 d-v35hiqr2z8 x ,dsff initial speed of 4.60 m/s. Ignor-5 s38q dvf h,zxi2dfring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from re ajjsfj9gs(m/(9imm n f9k11fnzlk i)dl+;z, st straight upward from 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 wo aln;( +,/gfiklimszj)kd j 1mz9f jf 1mns99(rk 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 al4znjbgj ovx ./:qr+4bove 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 resistancexg j4nz lvojb/+ r.4:q 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 fromra0gr4on +hr:x9a: ltafy4 vmdz;7 r9 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 net force acting on the mass during v d:t4x 7mhaz yrfgl+a;:9o0n9rarr4the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until the cordptfx0 93 b/gtmm 7a 2h2lzlkr7 makes an angl 2zmtx hm l3agbt9k7fr/2l7p0e
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 i:n phrt7 p* 7vky5mt88of b*qa 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 then slides back down the hill. What is the sled's speed when it return* bq*t8r 7nko y8:7phpvf ti5ms to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, alon 2qsq(f r)e;ri/n.i( 4obofi)cs-veo g a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each c(;vrsn i.coefo-(q 2ie4is)q)b f/roarton 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 h5*ia5j pnai;9yd d 1l(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 doh;j nad dp 5i5ya*i1l9ne by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest wpiw fw08s2 wit,3cg1from the top of acwsw ii0wpt1,38f w2g 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 energies of the two balls changing?

  11.28: A person throws an object of mass M straightj:/ a;3phry 57i:aapv id h7nh 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 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 resistanahyjhaah: rn3d :75 ipv7p /i;ce.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N/mn+q 7bg,5 alk/exx 57v vbsy:m. The yb v5,sx:7agxvmnbl e57+q/k potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. vg 8m8zcp c;/xWhat is the maximum speed i8gp;/czm cxv 8t can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed -ryi:l6u4a5fnt ;l ilincline of height H. A person decidli 4r-; in5lt:fl 6yaues 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 incline and the object for both trials.