97.01: A force F directed at an angle of θ above the horizontal 74,hyhbwv8 )yrg x:7 rsqv.iyis used to pull a crate a distance rg 8h7q7 vixyh)r4s,:ywyb.vD across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of masskbqqz*c 2)-w*jkipt 9 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 ball*k wb)t pikqzqj* -29c by her hand is

  99.14: A construction lab40omi) k8d wi0ml9ljforer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During thi0ldl48j9 0 mwfo)imkese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides gcog/96z2 n.v7 +ttr44c 0wzx); zxgmcqycjjwith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly deqx;g 07ncc6rgw49 /m jyztt zgv 2zcx4.oj) c+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 uniform acceleratbzfr1czge.9i+7c w)f ion on a horizontal surface for 5.00 s. The block’s kinetic energy strictly 1fr7bwf)e z9+c.cg iz 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 thi)) 3o p1+i f,ugu:dvy1ucntt e right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest an ip)v dt)u u t1y13oic:fgu,+nd 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 to trm 9( /o5x/fygkz e .1h+dlyxthe right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal sux/+/zxk5t.grh( e91ylf o dm yrface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozed8f +,kzf)ul ;chshy7 n 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 descrf 7zsu)yd ;klf+ hhc8,ibes the above situation?

  03.14: A fan blows the air and gives it kinetic enedwky vk (2(gj tia/2ra ayx*))rgy. An hour after the fan ha )k)(g 2 a/ajr*v2wyytix(kdas 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 posit4ex4+ uf3sa,h2nlsa6gfjs ee jg, 7o/ion of 3.0 m, a speed of 4.0 m/s, sg+63 ff4e,s ohasgju4n 2lx/,eeja7and 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 -5*xbm2+oe6f)hb m4pe ywwh mis on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf tha*6h hfp) 42bewe +ymmm5-owxb t 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 21rd ,9t 6lb f8jopzf8aead w-14,000 watts (about 32 horsepower) of power to a car's driving wheels. If the ca8f,8 a1dtfdap9- zlber jo61w r 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 mov8j : f2x)/0xz ouc fpre*rvwr2re f(0bes 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 ofF = 240N. The box, o* ) :0z bx0rrvfe 82ocefpf r/(xu2jrwf 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 speed 5.00 m/s at the bottoje8tls6k. 3zzm of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directlysk3 z8tzj.e6l 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 straign1g u7( md5p;g), fxjyd atk6 v1ieuf(ht road. CarA has twice the acceleration of Car B. Afte(a( v7e,ujffm16dyi1tu p5dx ;ggn )kr traveling 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 actins d ,og*::nh 8sgw)dfxg on the object during the time interval of the acc),hs8w xn* gg:fo :dsdeleration?

  12.08: Through what distance does the object move during the time intv:tnfmj/-;+jh5rxc)ne c w;terval of th-mjw hj +xe:nfn5;/r v)tc c;te acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is change+ fxmnt mg.,q4d 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+ xqmfgtm ,4.n the mass during this time interval?

  14.11: A crate gains 36.0 J ofj.( 9pnd:i-:aqhswef kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the c:ih.sw ad-:(9qjfp en rate

  94.38: A force F at an angle θ above the y0;mi-p yp8q. b 5jfbshorizontal is used to pull a heavy suitcase of weight if;jq0b.bpp5- y8ysm 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 uil)up kg( 8;qwhj3 vq0 gri(pebaa(rs*2l.2 of 0.10 w to raise a block vertically at a constant spee0 2r(lu)aq(g*(8; p2pw.sgiqvbue ihlk 3ar jd. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object ogg3co z,17- ygtw.dsz47 k juis released from 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 tw1oo-g ,4gk.ycj 7zud 37szgEarth by the 1.00 kg object during the fall?

  96.18: A rubber ball is heldnljgbj44r .tx30z2h0jd zja 9 motionless a height ho above a hard floor 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 adt.j94gj0 z0b3j na 4xrjh z2lbove the surface?

  07.06: A 500-kg car ish8nr mug)4bm: qpq p75 moving at 28 m/s. The driver sees a barrier ahead. If the c48 gr7bmqunh 5pq:mp )ar takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball movmveca 979sw z3ing at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the averav9 39ezscw 7mage net force applied while it was coming to a stop?

  02.26: Consider two aw4hqi tvku l9,:m )19aozs:blaboratory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements wvo:, ku14 sami)tzhb a9q:wl9ould 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 vertically in the aiyh g)i,,uh qy5 sbz-g ;fq,cc9)hl)g hr with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy w ,b )qhfyihsz)cqug;g ,c5 yl, h-9gh)hen it reaches its highest point?

  06.20: A boy jumps from rest straight upward from afb) 38b6no fsf flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and b )o3f8fsbnf6his 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?

  02.48: An object of mass M is dropped from aheightH above the g2lm6 + cqsgld .-mc ;mw/i6sxpec4/c vround. The object crashes into some soft earth and comecew4sm/ .s2m- 6qxvmi p/clgl cc ;+6ds 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 while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The ovuearbsoa. 3p9 jm 5) a87bzf5bject bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height H/2. W75.9b5 ou ejv bmpz 38sr)aafahat 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 esp6ibz(9xjb;xtv, iejxn5:3a 6 i)o is pulled sideways until the cord makes ane:3 5p)(jxni vextxszi6j9bib 6oa;, 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 sljz 7.f72bev4t n(kpy zed, 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 pokvpy7bz(t.fen2 7j4z sition at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the side fv +,v+7o pwjmeayza3.(7pnj+w: x frwalk, along a 10-meter ramp to a loading dock, which is 1.5 mete7w ve+:zvr 3(pxn,pam jfo+y7 f+wj .ars 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 (amsi w3s0 mhk2+s shown 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 th2i+0m wh 3mksse work done by the force F onthe box for the motion?

  04.48: Two identical bowling bh 0fauzmu.79v ip0. qsalls 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 0piva9qs. z0.f hu mu7balls changing?

  11.28: A person throws an object of ma6ben+zuc)lr uex+ 71s ss 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+sx6 1uelb ern7)czu+ 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 20 Ns.p1 y2mvnni+nn6o evm6j h4 -/m. The potential energyvn62-mon yvn1he4n.p +m6isj stored in the spring is:

  97.10: A compressed spriq l.h;b .1 wxg*,doogong has 16 J of potential energy. What is the maximum speed ilg; *d1,xwhqo g..o obt can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bs7l7(0 ;1hy b 0s .q ek6fc3qrtlnijfsottom of a fixed incline of height H. A person decides to push the object up the incline in one of two ways r fls0lj 1; ecqqs(3k7tb7f6h. is0y nwith 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.