97.01: A force F directed at 3w9v r)+ezhhoe/um ib*4 mq6v an angle of θ above the horizontal is used to pull a crate a distan 9b/6em*hq)zuri4meo wh+vv3ce D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball 8u .lnho*+ mh5 4xdgys1nzxs5of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuhsxn85z u+o5hlg* 4d 1ym xn.sming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction labocm t6kh ,nt5rg( bqt6(rer holds a 20 kilogram sheet of wallboard 3 meter above the floor for (cqk,(ntt r6b 5h 6tgm4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block ;y6gu,cvjddf r*l ajn9d41x; slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly def4 d9d,6l; yx1gcdnuaj ;vr j*creases 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 uniforaye4y/q7,g w e(p:fxc m acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 57:c(x,e4 yaefp/gwy q 0.0 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 th h5x7nb77rx 8vx9:ctgi 9 nphne right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizon9vbhp7 r 8g9:7n7tcxhnixx5 ntal 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 ra 3ceh9rvz 71iight is exerted on a 3.0 kg block for 5.0 s. The block was initially at rv97 ehcari13 zest 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 pjm:a7p4ns hj,ond throws a 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. Wh a7jsjmp4n,:hich of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kgrfff -rf 62p 4nwsi8 nd2,c8einetic energy. An hour after the fan has been turnn,sr4fg2rp6df e8w f8fic-2 n 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 *n w5xzu22dezrr+tpt)n ,,vx of 3.0 m, a speed of 4.0 m/s, and an acceletwv52p2,nutdz*)rze + nx,xrration 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 middr+)b41b5vetubr sya6 le 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.e5b vtauy +)bs6r1rb4 The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 hklbj dx.c 8jf:nr 5-(rorsepower) 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 magnitude of the retarding fbj8kr:c-fjd x (5.lrnorce acting on the car?

  09.13: In the figure to the right, a box moves a u.--b clk+x6wh* g3xn;yx hn2qd)4y:ujyv gwith 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 *q-63wc;-xlyu:ayuy)hnd.jxh x2g + vnbk4gforce 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 sp ai21ti8x2dy ,awtxzv* e*3ch v.f8eueed 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=va uci w 2te8th y,xa.*f8 3v1i2*dzex 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 n)ooz)g10k sizd v;v6.fqfc/ to the right, 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 B. When Car B has traveled c z)o.6zgo0i ffs);n qdv/kv1 the same distance F, what is its speed in terms of B?

  12.07: What is the net force activv (t,eo(sce,c, )n(p:sehuw ng on the object during the time interval of the ,(sv((neuwpve ,:h cc)ote,sacceleration?

  12.08: Through what distance does th2 cc.5m f3aouw :xhw;se object move during the time interval of the x3:ofm.s5c2w uawc;hacceleration

  12.19: The magnitude of the linear momentum of a 4.00loq m 17 b gfkc.8c(gi5-ysl+0g-ly bg 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 energy0bgsb y-loy c+cgli(qg fg-k785. l m1 of the mass during this time interval?

  14.11: A crate gains 36.0 J of kc/aifxy 2 +7+lebmd j/inetic energy while its speed is increased from 2.00m/ mb+xjld2/a+ ic7fey/ s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at *koaw ibs.qo 0s/:ok3an angle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The c:0 w io/*aobqss.okk 3oefficient 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 upwargyx7t 843x yr:e lf+pzd force and delivers a useful power output of 0.10 w to r74y3+ft x pleg8r yxz:aise a block vertically 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 releasedzv+1+ ;zdt f.*c c jjw;ly7kqi from rest near the surface of the Earth, the gravit k1;l+c7;jjfiq*cz +td. w vyzational 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 rela(n/8ba bb0 uveased. Assuming that the collision with the floor is ebb 0v(a/n 8abulastic, 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. Th)e jrdq/u a9bkk 80uycjh8i52e driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of a0r2qchbi)y/5e ukukj9jd 8 8the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until r6z5g,zt 9ifi it stops. If the ball travels 15 meters, what was the average ne,fzgti 69zir5 t force applied while it was coming to a stop?

  02.26: Consider two labo):lh g :/3r8yzcsvrme3 xeea*ratory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements would b3vemg)s:ax e c ye3l/h r:zr8*e 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 wiqnl d-g0eh54 t iq0ig4s y-rj.th an initial speed ofls g4igrth0y-j5 40n qi qd.e- 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps fme pz2 1iox,ki 4.kak*rom rest 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 womo x1,a2z*pkkik.e i4 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 above the ground. The objeal:34zs g 9oklzqqit1qp 3la*,ht, +oct 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 who3h4qpg t,aq aqzl+slz9,1oik* :3ltile coming to rest?

  12.48: An object of mass xsv7g /mi:,:xh mk9kjM is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then ri v:x97:xh /kigmk jms,ses 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 ma yt 3lfv1i.o :w53irskss mon a cord length L is pulled sideways until the cord itl13ri: k3f.s 5ow yvmakes 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 unknown angle. The sled, whi.wjvxwa 2box:jgx1q1g958 cfe h 0z4 dch started at the.1ejx : qgxw0 5woh 4f2gbvdzj19c x8a 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 returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramdxe* n4:g w5uap to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass odg5 *uw:xa ne4f 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 eu :nfzhz/)rg 19p+h bF=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mahp/g: 9+buf)n hrz1ezss of the block is M=15 kg. Which one of the 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 aro p+8qp(f fx3ue each dropped from rest from the top of a tall tower. Ball A is xfo8fqp3 + (pudropped 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 otxwlkv4e,.4g bject 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 straight upward with initial speed 2v. In terms of H, to what maximum height does thetwe l4g.x4,kv object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretcx:u ymaop-90 phes a spring that has a spring constant of 20 N/m. The potential energy stored in the sprx9moppu : -0aying is:

  97.10: A compressed spring has 16(ps;iv wjc f2 .-p9lbjvl+q d( J of potential energy. What is the maximum speed it can ;v(.fqpjds9 l j2+ pwcb-il( vimpart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottog3k/hc msi m+jp.rfl3fp3 b0 ;m 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, th;h 0+g/i mffjpsmlpk.r33b3 ce 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.