97.01: A force F directed at an angle of θ above the hor hlw1*z i-*4nm4lehtjoy( 0 wlizontal is used to pull a crate a distance D across a level floor. l4 ow zehl-tyij0(*h *4ml1nwThe work done by the force F is

  97.33: A softball pl)k d3 ;uc(s 5tmec6kbt8zlv0uayer catches a ball of mass m, which is moving toward her with horizontal spksku 5cte(6l 8)dtm;3 u0bvz ceed v. While bringing 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 sheet of waimbgnk-xm87 0nxm+ d0llboard 3 meter above the floor for 4 seconds. During these 4 secondshow much0 7nx-x 0m8bg midm+nk power was expended on the wallboard?

  17.11: A 5.00 kg bl1gsbr6uogo* z,mg-d*xx- d 3x ock slides with uniform acceleration on a horizontal surface for 5.00xd,* s 6bogzu-g-x*g31r d mox s. The block’s kinetic energy strictly decreases 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 bluz a51tj/*lyhxp0/n rn dzqy :4t fl35ock slides with uniform acceleration on a horizontal surface for 5.00ly*n 5/fz/ u04 haqpxjtty:l35nd1zr 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 directed o:j n86cvro) pto the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizoj 8o :r6v)ocpnntal 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 samf3)ny2 q,bkg block for 5.0 s. The block was initially at rest and slides on a horizontal surfaa3b2s y n)qm,fce.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictk+y*huxgd g+8 ionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the studen k*+ud+ghg8yxt moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the a x0pgrwon9dq )*gjxm.u /n+) iir and gives it kinetic energy. An hour after the fan has been turned off, rg*+pi xuqw90)gjo)d.x/ nmn
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a posexa9s8/wo9 p+nlx 6q iition of 3.0 m, a speed of 4.0 m/s, ani +wa8 x lxpn9e69q/osd 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 the bookroom-t mwum 8jk(ilw(5d3 b 1.3 m from the floor. If the janitor rd5k (8mwu(bj litm3-w elocates 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,d3woi1;vxjjweh3w c+z;/m yp nq*x e rpc5.:9000 watts (about 32 horsepower) of power to a car'+coc d3zv;j9.q*p5 rx/x1w:w;nhe 3pji mywes 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 wikt8/evp9 80( pq +qq;x skpdxtth speed 5.00 m/s at the bottom of a rou8 xt9pxe dpqqsvk(0 /p;+8kqtgh, 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, a box moves with speed 5.00 m/s at the bott/feinhi7t o;lau8(.h,p c .uy zf2uo. om 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 withhypuu7c , ( o.uf8aioln.e;.tzi2 h/f 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 froci pe+.k2i* rzm rest, along 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 ine2zcrki* .i+p terms of B?

  12.07: What is the net force acting on the object during the time interval ox mu;)9img l)tn 11(u;ptfoa ef the m11 to)up9fue(xt;anmi gl );acceleration?

  12.08: Through what distance does the object move during the time intervali:ni01r:, 4yppag idr of the pn: d4ir g0r:y,aipi 1acceleration

  12.19: The magnitude of the linear moments-7r r2er 8z rs6g /gtmwkq53mum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m-s kemqsz2gmg 8/ 36t7 5rrwrr/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 ki(uv u7(;gf1 ;bn +a,gk lxwxyo; nfo/xnetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best repr/fnxf(+1klbyago u xn (;;7,guv;ow xesents the mass of the crate

  94.38: A force F at an angle θ above the9((jfo1 uud b(xr2n11m s euhkal8)si 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 for (is29 ( 1) lkj8osbu1 rudhe1n(faxumce is:

  14.31: A toy crane exerts an upward force and delivers a useful power ouwzouauww4 zw//y.x*g,r 8/9kvzawz j l6;z/atput of 0.10 w to raise a block vertically at a constaax9.uw8azogu ////z; lw *r4kzwz6,vzwway j nt speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objje epbxdne ./atur(z h t3wv47*z;.o 4ect is 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 tnb vj4tx4a3z7oeuzrde/w;pt *e .(.hhe 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 floo 3k t*-7j9)uhomla2a jt.aaiojnic/4r and released. Assuming that the collision with the floor is elastic, which one of th4nmaa)a .o *3 -j2 i/tk ji9t7jaluhcoe 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: x49bipga ekr2ohm:, at 28 m/s. The driver sees a barrier ahead. If the car takes 95 mete,e2px4 gr:bo9h ak :mirs to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slowg3w r cds cu.cy8l:u,3s down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was u:ccugsd cl ,r3w8 y3.coming to a stop?

  02.26: Consider two laboratory carts of different masses but qxwttp7xn (wz *-i06fidentical kinetic energies and the three following statements. *tpin0w6xtfq-( x z w7 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 a1l;qsu zys*bbe;. fc5a48du vertically in the air with an initial speed of 4.60 m/s. Ignoring airuqe; 4 ac;b1zaf. *ds5lybs u8 resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationa x,5j ztsrxld7 (dg0w7ry 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 co7xl0 z(rtdxs,7wg dj 5ntact (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 ground. The oiatbij pem.tc jo/m43 :y; nl,9lc3*sbject crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negligible, 9/3p3ibm.c:*jso ;til 4,eatmyjc nlwhat 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 fr19kb 3b/ 66xynmhtyd4wtw .dfbc /mo; om 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 th k/f; t6hcb/4bt3modwwy1n6d9x bmy.e mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways ubl rta4*wa9n(ln*io45ugk q, ntil the cord m nu*l49ra* gb4,wqi ak l5ont(akes 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 m (r*5ddd8wbeg8u 5 diof 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 slides back down the hill. What is the sled's speed when it returns to its original position at the bottom of the h5d8e8 b*di udw(rmg d5ill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, alon-cki00rq8 ux lg 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 the8i-c0kr qx u0l loading dock?

  12.16: A constant force F=50N (as shown in dut29bv* xe.ir qzf4. the figure) is applied for the 6.0 meter mo. tibvz e*x ru94.qf2dtion 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 force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest fro 8zun3 k1fg (ihxw7mq xcn)j/5jpfd51 m the top of a tall tower.8d7 515g zwnx h/cu fq)j nxkf1mijp(3 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 object of mass M straii3n ,jg +mszung )5tcyrk1+j+rqf 5,b ght upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person noqin5 rr)j+ftkn g gy b mz,5s+j,uc3+1w 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 co2el y))ctg:4ldar.yhriv-: . hkt/ tznstant of 20 N/m. The potential energy stored in -ar.h z )4e)hcyigl/l t: td2v :rytk.the spring is:

  97.10: A compressed spring has 16 J of potential ener:2sirg2 h: lpugy. What is the maximum speed it can impart to a 2.0-kg r gi2:hspl2u :object ?

  

  10.31: An object of mass M starts frxpq, 8xd7.y ru9kzir( om 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 the xp89iz k.qyu(7 ,rdrxincline and the object for both trials.