97.01: A force F directed at an an8)v,2qyc3 y u u xlsv*yik(6xagle of θ above the horizontal is used to pull a ,i u xv2y6c)vy8*kxslau( q3y crate a distance D across a level floor. The work done by the force F is

  97.33: A softball play9ptz2cc v ymug54x79q er catches a ball of mass m, which is moving toward 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 ba5 t9x yv4gpmz9u7c2qcll by her hand is

  99.14: A construction laborer holds a 20 kilogram shelf(ns j;i0iw2et of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was exp2 f0(nwsil;jiended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acz-e ,y7o . vbkb1dfm3n1vbp.pceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from.b-, mvdnp z1f.b7op vy3eb1k 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 uniform accelerati,, fg9x0ymrn3pgz :a5xbzne (on on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J 39x:n05gyef,x nzp,(azbrgm 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 39:fm2k s8c w/tcsgx3h;-w cnx;g*oi b.0 kg block for 5.0 s. The block was initially at rest and slidesnt-s*gw ;bowc 8i /sk;c29xf xhc3g:m 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 to the right is exertpa7g5 wpw3m6d ed on a 3.0 kg block for 5g 7dp56 wawmp3.0 s. 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 frictionlessq(h. cty wcdc s8bo;6c-qbm+w+km99b 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 b6my+ms qwo .; wcbdc98-hct(k+ 9qc bin the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and givemz(cnn( pczr1gt w sj e/:;l99s it kinetic energy. An hour after the fan has been turned off,(/lcznj9z9;smcp( rt ne:w1 g
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of massww:yxv(zqhbr + lk ( *iz96ma9 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration wy9h w6v xq :(a9(zl+*mikrzb 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 v5 rx6 he(+wz wo1()4wqzwk7eqgq7ndmiddle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shel4 vz edr(6h(k)w+7 7 q wgw1zweqonq5xf 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 deliversc*xq oauocj438:yx+k2* oha j 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m3oohjqc8yu c*a*xo4xk j+a2 :/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 5.0md2p s ,+;vhcmptv 5/k p3n7eo0 m/s at the bottom of a rough, fixed inclined pla7mhkt2c /3,pspvd +m;pe5von ne. 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 n t1 .e(o:pfvl6zsm-hright, 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 = 2etm(:hsv -ol pf. zn6140N. 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, each9.f0l: edm 0dm8wng be starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car Amme8n .l 0dwfg:e0 bd9 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 tim7s2.sfnncd,c bvh8 q.3e+se,e 1mt6i6r tv nze interval of the acceleration , ,3.t n8ts2ch6efnb6ev szi7ed+v qsc1n.rm?

  12.08: Through what dspa,(l+2 xaj fistance does the object move during the time interval of the acc+axsjpa, (2 fleleration

  12.19: The magnitude of the linear momentum of a 4.00 kg:i (c+eolr)sj 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 energy of the mass during this time: o e)+ri(lsjc interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is incrl6fkm yhy8(lmm .d j -b+*45jeuzsu1 veased from 2.00m/s to 4.00m/s. Which one of the following choices best repreu 6mljy1 dk5v(ujz*+. ehfm8 bs-myl4sents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pul5uiqjdqj5ck x 4wh4qc0kb 6 61l a heavy su6 0i45cb 4u5qkhjxwj q6 kcq1ditcase 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 is:

  14.31: A toy crane exerts an upward force and delivers a useful power output of wai6joi5 6lp r7znl62 0.10 w to raise a block verticallzl 57p ljirnwi66o 26ay 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 released from resdxk o3t. )e*xtt 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 g xkt.e*3xtd)oravitational 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 nie ;+)9mpl+,uganec hard floor and released. Assuming that the collision we;cpmn l+a,n9)+g iueith 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 ar4 u,-d8oizj ky( kdeq66hfh.etb ,i -head. If the car takes 95 meters to come to rest, what is the magnitude of the minimum h 4t ou6 8d, iyede.(,kkfb-zh6ij-qr average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down unim bthe q(n e(5fv,)o5 *ge- uc(lwaxj5formly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming)(,cx5qmeel *5-( ah jnuwb(fog5 evt to a stop?

  02.26: Consider two laboratory cartqeilzu6t ,2jn4emipo(9at j+ph)- 5 ts of different masses but identical kinetic energies and the three following statements. Which of the above statements would be correcte)oiz9ep j(2 jlm-ith6p tu+4at, qn 5?
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 inp7l1p1 gi 9dj:qmle*u the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential eneup ljmq7i1d*l 9pg1:ergy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward;,. ckojcalk ;xa m33w 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 bo3.o k3aawjk;l,x mc;cy’ s feet and the concrete do on the boy?

  02.48: An object of masby tyc8afapm2 s:na(i,7*/2b) luic ss M is dropped from aheightH above the ground. The object crashes into some soft earth and comes toin2s( /f)tp a:y uy8a7b* c2lim,b csa 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 while coming to rest?

  12.48: An object of mass M is dropped from aheig 0nh8n4fg .nlbzcm 88lht 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 the collision with bchz88l 84n0g f n.mlnthe surface?

  96.38: A pendulum bob mass mon a cord length L is pulj k8,.vc ko4*dg: bpkvled sideways until the cord makes an angle kvb: j,gdp*v o8 k.kc4
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 in-p-b dm)kp /yc gkgo5 in:+3xfcline 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:-k-kpf xc/5+ )yd pmbng3ogi 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, alongq biq/s *0+iax.xekq3 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 deliveryman on the cartons to move them to the lo+0qaeq/.xi i*xs 3kb qading dock?

  12.16: A constant force F=50N (as shfx azd *y urscuc* (;mmn:-up.-yf rq.1um3x;own 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 done bapy.x3fucx f.u-ur *;myd c*m :(mu1 nzr; -sqy the force F onthe box for the motion?

  04.48: Two identical bowline9( tp0 b4ggvjg balls A and B are each 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 the ground, how are the mechanical energies of the two balls ch(jt49 gveg0bpanging?

  11.28: A person throws an object of mass M straight upward with an initial non-fh6*tu-; 32 l-h+u hytxrxa(c vbyf0szero 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 mahylchy*+rsub3; 6-autft0(x fh2 v - xximum 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 0ov gewh 8r(8hof 20 N/m. gheo vh88(w0 rThe potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the k.-i)a+;:r 4/kzdllkuuykst maximum speed it can impart to r s:t +uaul4/d)k-klykiz;k . a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline of 6(nu:i( zfowatu / o6hheight H. A persooz:(o 6(t/f nawi6 uuhn 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.