97.01: A force F directed at an angle of θ above the horizontal is used g4vnmo18flp6 to pull a crate a distance D across a level floor. Thvo81n 6pf4gmle work done by the force F is

  97.33: A softball player catches a ball of mae14oxh(;) /x 1 yvdcu ijgc.tnss m, which is moving toward her with horizontal speed v. While brino h1uc/ jv.g;i n)cd1ext(x4y ging 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 sh9 w+*0dm; mi-lmuq-7tn rkcn geet of wallboard 3 meter above the floor -dknc0m *lmrgm u7nwq; -+9i tfor 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides wh )uzbwhmd2l6a6 + )d7qrnr+dith 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 tm)u)7 h+ + wbh2 zrddlqna6rd6his time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration on a4t*ukku8drc wgu0ohkh; z-; + horizontal surface z u uo4kwu+kkdc8tr;* 0 hg;-hfor 5.00 s. The block’s kinetic 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 direc(8raxkr9+9tpk wda tz5o/07ru4b do sted to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at d59 oo8+ atdb skru/7a 94(w0xzkrrptrest 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 c ujej;ylg 9 kywx.947to the right is exerted on a 3.0 kg block for 5.0 s. The blyj 7jc9ey ;lw4xu9g.kock 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 initia) -59zs+m-mbhb enruzlly at reston a frictionless frozen pond throws a 1 kg hamme e-bzub+s -h9mmr5n)zr in 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. v0c kpj744ww) 1d:ahg tf-oiq An hour after the fan has been turnp1q)dhjaf0w o7g: tc w-4v4ik 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/db,02srzf 8 s q7v *ckwk7hea position of 3.0 m, a speed of vhs/kzb*2sf77 q8r,a0wekd c 4.0 m/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 thm)n os c :2/gmvv;)czoze5h+ze bookroom 1.3 m from the floor. If the janitor relocatesmv+z2)c)hs n:zg;ec/ zo5mov 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 delivers 24,000 watts a82x+rgw2ros 7ypo 5g (about 32 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 magnitude of the rerg+x8 r22 o5 pwoyg7satarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the boqp 0;s ayg8lr2ttom of a rough, fixed inclined plane. The box slgl2 s8;rya0qp ides 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 2.50 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 v 0yx f4kv.ohm/qun,w :g.ls7moves 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 dg4.vm0vysw lx,n:kf7 /ho qu.irectly to the left with a constant 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 right, each starting from rest, along a straigd*m (h dh2dt(y.cf6gz uhi+q,ht road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same dg(f2.cuzqmd *hdd(ihh +y t6, istance F, what is its speed in terms of B?

  12.07: What is the net force acting on the objecth,s3ddk/txb,8 fzxoo g wj333 during the time interval of the acceleog/j8,xk 3zxw t dbso,3hf33dration?

  12.08: Through what distan/k :giso3fvh8xgmakuq td .sr/w. v 2e v78*-hce does the object move during the time interval of the ac2vi7v moqg8 8:.*h dgukwssvx r3 f he/.at/k-celeration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed g5dzjarx1 oaefk,tdf;e4+-0 fw 05fo from 6.00kg.m/s to 14.0kg.m/s in; ,rw0d+xzf1-fo0 gk e5f dojt ae45fa a time interval of 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 kinetic energy while its speed-)vc zlt.oph0+ gc tj5 is increased from 2.00m/s to 4.00m/s-0 )oc.g5+hzptvt j cl. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle j7g5b5jrjch 0 ob 5u-gθ above the horizontal 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 by the frictional force 5jo-cgh u57b jjrb5g0is:

  14.31: A toy crane exerts an upward force and delivers a useful power ouqm90 v atnx s919dknr;tput of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raisedt 9;r1sxv0nna 9qmk9 a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near ce)rl r+e4aq, bez)x4the 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 ab,aer+l4 cq4e) zx)res 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 fly:n(n+y x 2(u(-n:gk poy mzbroor and released. Assuming that the collision 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 typ (y2 nbx:(n:go(yuzmr -k +nhe surface?

  07.06: A 500-kg car is moving at 28 m/u86c,minin juv 0p: f a/ejk9*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 net force necessary to s*knepvnim/ f 0uj 98ca,iu:6jtop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. ,l:.g7 pkq4ynl )ryhu If the ball travels 15 meters,kqy 4rg :lh,7ul yn.)p what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kli415enqpdqotr4 6 98s unil ,inetic energies and the three foll oqt19n 4p4,e qnsilui 5rd68lowing 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 verticallynt8ya) rij9p : ,rm:-gy0dwkp in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?r r0p)d- 8:w 9ypjn,gti ym:ka

  06.20: A boy jumps from rest stvemi5 wz nvf9/.tm s6g6lst*7raight 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 work did the average normal force of contact (N) between the boy’ s feet and the concrete do on the boy?56ti /*tv7ss. lf 69wgev nzmm

  02.48: An object of mass M is dropped from aheightH above the ground. The ob+mcgv1 0maf 9sject crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is neglig0 fma91s+cvmgible, 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 abovehx 3v5eo40r*h6 w,6q redhgih the ground. The object bounces off of a horizontal surface in a collision lasting time T. The objohg 65x hqeeir0h d3,4*w6 rvhect 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 length L is pulled sideways .c k/ysw q0c 7vnwugcrms*0.3until the cord ma .7kqrcm c.wns*0uvwg3cs0 y/ kes 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, hzsrb) 2fg(juv/bf7 1+u 9ag-zr 4ryu vsg4w0which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above its starting - /1jrbsyh fgv+wb42r(0 uzgsz) vur47g f9uaposition 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 ramp -(ne (dgir+ xrto 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 doxn(e+r -i(g drne by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure7h:dxcal;w3cq*)rhuv2 5 hn v ) is applied for the 6.0 meter motion of the bo5;v23hc7duq )hc*lnvhx rwa:x 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 force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are r+d8bgd ffs;: /w;oqed -uj9 leach 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 strikes w9qol d/fej d;;ru+:sbgf8 -dthe ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of masscod7 w7) prgb0 M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person nor)ogdwcb 77 p0w 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 constant of zk5( 6a 4.skkaghglx qggc8j+ 4big:320 N/m. The potential energy stored in the sprinkcbg (xi+hj.g gzaq g:43 4l8k6kg 5sag is:

  97.10: A compressed spring has 16 J of potential energe;oemg*+x ;yqy. What is the maximum speed it can impartm x; qe;egyo*+ to a 2.0-kg object ?

  

  10.31: An object of mass Mjb)f:(* z -z mup*bmzd starts from 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 the same constant non- zero coefficient of kinetic friction between t- *z*:dmf )uzbjzm(bphe incline and the object for both trials.