97.01: A force F directed at an angle of θ above the horizontal is used to pulakbr/l2dkm (r k(un7q5h7un7l a crate a distance D across a level floor. The work done77(mklqh/a2k bdnkn(u7ur5 r by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her z o )t k/s4rmmp/3.rlmwith horizontal speed v. While bringin .szrm/ mrko)l 4pmt3/g 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 kilok vnj/v9 c /si4.a* q3e+fhyorgram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expeo hs9ia3ne .j kycq/f4+r /*vvnded on the wallboard?

  17.11: A 5.00 kg +5)mcq/yztq2e 7zu ug block slides with 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 thg eut2z+ zy 5mqqcu)/7is time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceler4 fe)ffxvcvizsn1f4 0 dd9ugs,3d;r ,ation on a horizontal surface for 5.00 s. The block’s kinetic energy strictrd9vi,4d4zfv 0x)sgf ;f f1unec s3 ,dly 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 on a 3.0 kg block for.h7m- b shj 6fvt9kzo: 5.0 s. The block was initially at rest and slides on a horizont7t- j.v s:bhzfk6hom9 al surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force directe k+l*nre td5 ;* ;s9qet7uarhud to the right is exerted on a 3.0 kg block for 5.0 s. The block was initiae5 *r e;t;+k*asrluhn dq9t7ully 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 f3rbbfpx+ g5 /4*eorc at reston a frictionless frozen pond 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. Which of the following correctly describes the abx3gb roc5* /e+rbp f4fove situation?

  03.14: A fan blows the air ,5pn (w 4ooo8l/ hijrwt+msk2and gives it kinetic energy. An hour after the fan hasj,li mn4kpho+wwotsr ( /85o2 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 ofo 8yf55n5a.z;tsu i,kyfr; -yap nd(a 3.0 m, a speed of 4.0 m/s, and an uyff 5yn y5kia.5,(;asd tnoaz 8p-;r 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 www/rb3z0 xv,j- xy+fshelf 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, -,rw0xw v+xfb/wj 3zyhow 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 (about 32 horsepower) m nzg,zlc f(wi2 5ze,/of powercnig z/fml 5,(ezz2,w 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 force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/c0pz smcj4,c -.3tcnis 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 ofF = 24c -izn,ctpjc4.m3 cs00N. 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 witbvvkh3 kb 4roz;h n44e)m id/6h 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 2.50 m/swhen it reaches the dhr 3;m4ho)4/bzenv46 kb kvitop 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, alonqy9dott o;le *; 7btv9g 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 the same distance F, what is its speed in termv; lo bd7*9;otqetty 9s of B?

  12.07: What is the net force acting on the object during the time int-w7la;9gv/ xb6kp f id;dfs d1erval of the ac;iw7p f;l6agdfks x /1ddv-9bceleration?

  12.08: Through what distance does the object mo8 oxaxduqsg* xl)(;,j ve during the time interval of the accelera x xd *;x,oasjql)8g(ution

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed fy4 zguec 3,jzyoiy( mv +:;1xs bozmtd7693 xhrom 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the3u ,+mct d47hx;yyjyeg1zv9moz 6 zbsx:(3 io kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy whild46jlc /1f8d1 qoofhae its speed is increased from 2.00m/s to 4.00m/s. Whi8flh 1jq o/cdo d4f16ach one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used dgt kee)8d:5+u1 ko qpto 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 frictiqd)+ope:u 5ekdg8t k1onal force is:

  14.31: A toy crane exerts an upward force and delivers a useful power output off,1svazyha k 866-2z h(uqcwf 0.10 w to raise a block vertically at a constant speed. At what ufh sa1fhc z,k(866vwq a2 -yzconstant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the sur0 ftrb 08ohni/dk/pajwv .7s 6face 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 best represents the amount of work done by the gravitational force acting on the Earth byfrsoh0a./n j 7ib8w k0vp6 d/t the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard6ceo; nnuj za91cb2qv5v+5sq floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relatiob6ncq51+;vjv2s aen5 uc zq9o nship between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is rlfy hik/*h p49k d6o+sfc/+gmoving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to 4lf6 f*ki +9y/rks gpdho/h +crest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformlyv.js/o,znm+ 99;kfsd zhu9 b y5ee;xa until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming t/h;+u5exs; o v, 9b mzjnefd.a9zyks9o a stop?

  02.26: Consider two laboratory carts of different masses but identical,1 o +bfl:uoiv kinetic energies and thef iv:1louob,+ three following 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 v m h 2r8rp9;6 bbqcwb/d 1atm-jtx/j9nertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in it bcm 2nr-j8/b9mhb r61jt x/9qtdp;aws potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a f., eri6/u*upnfto + 7tu,88d zvclgv klat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of megt+n uplc/8 it zkrdv 7ou*,,f6u8 .vass 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 f vt (8:+6r kogag7gdsnrom aheightH 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 magnitudgg (dt8nv+6r:as gko7e 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 gro +h:lxb0. .n yl1hrzkhund. 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.1b+nhhryx0:ll. hz k the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways untiod5;u t9pqin2l the cord 9;u5pqd2ti nomakes 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, which l t*u0 mc/w70yyfkh 66zrmbv. 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. Wl*6bwcfm yt/h zkmv .6uy700rhat 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 sid1 vzczkc kra .w,1/laozpj)*2ewalk, 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 de/jza, v pzw2rckl.)c k*a1o1zliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50n3,xv;gh3yn e )mr3h fN (as shown in the figure) is applied for the 6.0 meter motion of the box upwardhr mxy);n nh,gvf33e3 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 andb 1 h4t4x,lavo B are each dropped from rest from the top of a tall tower. Ball A is droppedx4 v4h, baotl1 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 thro y;9bxi*bq5 7rkk ;sesws an object of mass M straight upward with an initial non-zero spere5b 7s;qik9b xk*sy;ed 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 spr;ngygnjtwln e94i fh c):r6,k0nls6/ ing constant of 20 N/m. rsnf n4i6:0wlk)y, hc/n; elgt9nj g 6The potential energy stored in the spring is:

  97.10: A compressed spring has 16 J ofgi;a mp7h39tul2 zmhud:(dfk8+m h p 9 potential energy. What is the maximum speed it can imph k+ a 9mf g(3hh mpd7p:lm9u;u8i2dtzart to a 2.0-kg object ?

  

  10.31: An object of atyk*ezm2/v8 b 0cq1 amass M starts from rest at the bottom of a fixed incline of height H. A person decides to push the a 82m 01bv/aeyqkt *czobject 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.