97.01: A force F directed at an angle of θ 06f8 v hj3p (jj81cbessdvx d(above the horizontal is used to pull 3dej 6shxjbvcv( s8 j0p8fd1(a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving to2ffh 6uedo7,kl-uzd :ward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the b6:fkfe d,oz 7-l2 uhudall by her hand is

  99.14: A constructio6:5-c k*kkrubzzk 8amn laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. Duringrk5k8-kka:6m c zu*bz these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniformlfvx,tzp5)r* mn( u+ ds7x5ym acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 5 +5mzfsmxd(,p n 75ryuxvl)t* 0.0 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 unifvou88w p/ w6+ge4xo 1rwqfvb4orm acceleration on a horizontal surface for 5.00 s. T8 x41vveor/bw6p ow f+4wg qu8he 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 directed to the right is exerted on a 3.0 kg b08w21u3w 6otxst.pwicm;s m glock for 5.0 s. The block was initially at rest and slides on a horizont mcpo6 t8xg2;ww m3ss.i0u1 twal 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 x;a 6o6 imszffg+.r6wkg block for 5.0 s. The block was initialmx;z6i .g+6s6 ff aowrly 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 iniwo20 *k x oj(-py6ajbjtially 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 above swj*j(ajoo -6bk y2p0xituation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after the fpnafw 2 s2lp6,an 2,62pf slapwn has 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 of 3z 2gdc2) eyn8l.0 m, a speed of 4.0 m/s,)gnl8 cy2 zd2e 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 shelf8.mpcrf6fgkq. asgmy+ .w1 z j si*8x, 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 rfkgq.,c8s 1*+.j.mwy68 fm sziaxp gwork does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile eg-cm1h w/d 8gz+ ofbg*ngine delivers 24,000 watts (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 retarding force acti f-gbgh+zdwm/*gc 8o 1ng on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the bothfc0h tjjszb **,qkkram0xpy 65+w,:tom of a r *wh:c6jx0,yjkp+fzk ,rqa t50 msh*bough, 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 = 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, at*v+r 1mry7b c9 ka:5mbdfi, 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 consta9 v5fa*: r+m7i bk1dcryab,mt nt 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 r2e bl9v p46+xres+,gshq l/n zest, along a straight road. CarA has twice the acceleration of Car B. After travelinz42/9+p ,svnglq lerbe+ x6 shg 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 during the timexg3/u/lyq8 t .crt ew, )ez/dk interval of thc/gt. zwq/tr /eku3 8xye,l)d e acceleration?

  12.08: Through what distance does the object move duaq)p-wvp:nsc,ufdei * aow4)5 (fzc4ring the time interval of the acceleration,*c wd4( :-qeufs5picnz av 4)wfpoa)

  12.19: The magnitude of the linear momentumdz f *o8cw3v d;vqy) *vuva;1v5zj 2nw of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg 2q3on z;8w5ay vdzw 1) uv*vd;f*vvjc.m/s in 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 7quolfpe 57g0+ oyt- fspeed is increased from 2.00m/s to 4.00m/s. Whic-fq gp +e 05lo7yto7ufh 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 to pull a heavy st(0x:z-u xt( ;zrhgixk nk/n404e gdyuitcase of weight mga distance d along a level floor at constant velocity. The coeffici ny:0g(r xz04xktn h(/tuk g iez-d;x4ent of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exejh; +heh0j vef6j:43e)blt 7qytts /crts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg blh4j3j0hqv:thj e /7 ty;blct6e e)fs+ock?

  12.18: A 1.00 kg object is released ftd 0rd)h m z3437e fgsc+,j-y*vjm c:/qrmsbgrom 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 best represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kg object b,f: djzyhs)c/r4mgjq0 mr3c* td3 g+vs-7em during the fall?

  96.18: A rubber ball is held mo7t1bmj(pa p -ytionless a height ho above a hard floor and releasedpj( 7my- 1tbap. 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 the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead. If theqpaj49ozmh4 ( car takes 95 meters to come to rest, what is the magnitude of the minm hq9zo(a4p4 jimum average net force necessary to stop?

  00.26: A 500-gram ball moviytt-6s 6ca*f wng at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, whay6 a wt6-tf*cst was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different mws4etaagt.by* ,k 2g06cn 3iaasses but identical kinetic energies and the three following statements. Which of the above sta t ga6 aa.34c*i gwsk0e,tyb2ntements 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 tossede ,:lsqqels3,h (bk6s vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the ce,(e,sbql:h3 6qslskhange in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, statioggpy)h be75b8a),yvf nary 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 ma7gfgb5vp),yyehb 8)otion. 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 droppqy3ah r8+a /10z0jqwhja. zlx ed from 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 azaq0 .lzhjx+/j1a03 8 yrq hwnegligible, 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 drq;t7; u(ps8idrrr+dzex v9 uqedh1:7 opped from 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 durin rr 1he 8;:z pvtds rxue9q7uid+;qd7(g the collision with the surface?

  96.38: A pendulum bob mass mon a corqwt 8c p (zj ;wn06+*z8gusjlsd23jjdd length L is pulled sideways until the cord makes an 0szwtsg *j6( p8 2;3jdn8c+jjqw lduzangle
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 t:tg/fzls/es 9d:io7:e: lg w 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 returns to its original position at the botles9 ot:7e:zw:fdl t/ gi:g/s tom of the hill?

  06.09: A deliveryman 8v6lxrwhfgg m 9hptr94 z,9h+moves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1g+wrrt 69 x 4hmph98zf,vg 9hl.5 meters above the sidewalk. If each carton 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 (as shown in the figa2 h qws/rzcjg0dle(u(j*f: 2ure) 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 fo2jcudz/ ew(hf2j(g : q0rlsa* rce F onthe box for the motion?

  04.48: Two identical j d *w41cn*sjgbowling balls A and B are each dropped from rest from the top of a tall ts 4g*cn1 w*djjower. 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 objlqf9g+ r0vet4z -y)c.hfe; zd ect 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 thrfgy0efldt+;-v4c z.9eq)hrz ows 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 cons+l:t.1xnybxl i/ xwk4 tant of 20 N/m. The potential energy stored i: xwbkxlln x+ /tyi1.4n the spring is:

  97.10: A compressed spring has 16 J of pot0g )k+jatpzplw ,79zuential energy. What is the maximum speed it can impar0z97pwaujt k)l +p,z gt to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixemtz/jyeh68 sf :5m6eh ww je8qu503god 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 the incline and the object for both trials.h5wy88ge teqe3hj:5uoz j/66fmw 0 ms